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«. * *-■ * 1. -> ALINCO ALR-22 2M MOBILE ▲ DATONG HF TO 2M CONVERTER
A SONY PRO-80 SCANNER
WE VISIT MOROKULIEN... WHERE?
For Tomorrow's Radio Technology!
TODAY
t
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stsrr
ICOM IC735
BASE STATIONS
FT767GX
(Good news for FT 767 owners)
RWC Mk
IMPROVED YAESUFT767RWC MK2HF-UHF BASE STATION
We are pleased to announce that we have now improved the synthesizer (see reviews) leading to better dynamic
range by up to 20dB which now puts this transceiver in a class of its own! This modification ©only available trom
RWC and is fitted FREE to all New units sold by us. or we will modify any existing unit fa e59.50 inc. return camaga
FT767 MK2/RWC COMPLETE TOP CLASS BASE STATION (EX VHF-UHF)
C1449.00
FT757 MK1/RWC WITH RWC TUNING MODIFICATION
£789 00
FT757 MK2 NEW IMPROVED HF TRANSCEIVER
£^dO
m
FT726R MULT I MODE BASE STATION WITH 2MTRS. (SPECIAL PRICE)
£879 00
ICOM IC735 SUPER MINI HF ALL BAND TRANSCEIVER
"
£892 50
ICOM IC275E 2MTR 25W BASE STATION, C/W AC PSU
ICOM IC275H 2MTR 100W VERSION OF ABOVE LESS PSU
£949.00
HANDHELDS
if
' = Extended RX coverage available, call for details
VAESU FT727R 2,5W (5W) DUAL BANDER CAV CHRGR
•YAESU FT23R/FNB10 2.5W (5W) 2MTRS C/W CHRGR
■YAESU FT73R/FNB10 2 5W (5W) 70CM CHRGR
YAESU FT209R/FNB3 3.7W 2MTRS CAV CHRGR/CASE £199.00
ICOM IC02E QUALITY 2 5W (5W) BPS CAN CHRGR
"ICOM MICRO 2E MINI 2,5W 2MTR CAN CHRGR
CTEieOOyfSIM. IC2E)2.5W2MTRCAiVCHRGR
KENPRO KT400EE2.5W 70CM CAV CHRGR
•KENPRO KT220EE 2 5W (5W) 2MTR LCD CAN CHRGR
KENWOOD/TRIO TH21E2W 2MTRS, (WHILE STOCKS LAST)
PORTABLES
R690R/MK2 2.5W MULTIMODE, JOIN IN THE FUN!
FT690R/MK2 AS ABOVE CAN NICADS AND CHARGER
FT290R/MK2 2,5W MULTIMODE- IMPROVED RECEIVER
FT290R/MK2 AS ABOVE CAN NICADS AND CHARGER
SPECIAL PRICE £319.00
FT290R/MK1 2MTR MULTIMODE
MOBILES
•YAESU FT21IE45W2MTR NEW SUPER MOBILE FREE
SUN 5/8 MOBILE ANTENNA CAN S0239 G/MOUNT
•ICOM IC28E 25W SUPER MINI MOBILE FREE SUN
5/8 S0239 GUTTERMOND ASSY+EXT LOUDSPEAKER
NEW LICENCEES CALL FOR SPECIAL DEALS
f
NEW PRODUCTS-r
INTERNATIONAL MODEL 877R AIR-BAND RECEIVERS
This new tuneable receiver covers 52-174 Mhz as
well as CB in three bands and is a cost-effective
alternative to handheld scanners. The receiver is
fitted with a Helical antenna and has good
performance fa a radio with this coverage. It is
ideal fa monitaing Air Band, the two-metre and A* Ov
PMR/Marine bands as well as Band 2 FM Broadcast. A squelch control is also provided. Two
versions are currently available:
£39.50
Model 877R. fa use with Dry cells.
Model 877R. c/w nicads and charger. £49,50
DEALERS CALL FOR TRADE PRICES P&PE2.50
See it at Leicester, Stand 36
A
SCANNERSYAESU FRG9600/RWC
The Best Modified Scanners
FRO 9600
We supply me Yaesu FRG 9600 modilied receiver to Govemmenl departments and
profess'onal users. We olfer more .options and (acilifes than any other company We
transtorm the basic unit by improving sensitivity and adding extra bands. No other
scanner has this many options and modes available. Call now for much more information.
Overseas dealer required for our kit.
Modified Yaesu receivers, NOBODY can tune "em like WE can!
YAESU FRG9600 RWC/MK1 6O905MHZ IMPROVED RECEIVER
£46500
YAESU
FRG9600 RWC/1V1K3
RWC/MK2 KWSOMHZ
N CONNECTOR
£495
YAESU FRG9600
IOOKHZ.950MHZ
MULTIMODE
£595 00
00
NEW YAESU FRG9600RWC/HK5100KHZ-950MHZ ACTIVE F/END
£625.00 NEW
YAESU FRG9600 MK3/AH700CW35RV/PA4C AC PSU, COMPLETE
100KHZ-950MHZ ALL BAND. ALL MODE RECEIVING STATION
£699 00
ICOM 1CR7000 25-2GHZ ALL MODE SUPER RECEIVER
£857 00
ICOM ICR7000/AH7000 ABOVE WITH MATCHING DISCONE
£946 00
UNIDEN-BEARCAT UBC OOXL SUPER H/HELD C/W NCOS PSU
£219 00
UNIDEN-BEARCAT UBC175XL SUPER DESK-TOP CAN PSU
£199 00
REGENCY HX850 HANDHELD AM/FM MINI LB/AIR/VHF/UHF
£245 00
REGENCY MX700Q, SAME COVERAGE. SAME MAKE AS AOR2002
£399 00
TDK AIR BAND HANDHELD THUMBWHEEL MINI C/W NCOS PSU
£139 00
FDK
ABOVEMAKES
COVERAGE
FM BANDS
£. 39 00
MANYASMORE
AND140-173-OOMHZ
MODELS IN STOCK.
PLEASE CALL FOR DETAILS.
INSURED P8P £10 ON SCANNERS.
SHORT WAVE RECEIVERS
£572.50
YAESU FRG8800 SHORT WAVE ALL MODE 100KHZ-30MH2
£669 00
YAESU
FRG880tVFBV8800
WITH RECEIVER
VHP CONVERTER
£73800
ICOM ICR?
1 10OKHZ-3OMHZASAABOVE
TOP CLASS
if
ANTENNAS & ACCESSORIES—^
ICOM AH7000 SUPER DISCONE 25-1300MHZ INC POST
£79.00
NEW RAYCOM AIR BAND DISCONE 118-170 MHZ 6 ELEMENTS
£12.50
RAYCOM DISCONE 60-600 MHZ 8 ELEMENTS S0239 SOCKET
£27.50
SUN MOBILE 5/8 S0239 C/W S0239 MOULDED LEAD/G/MOUNT
£22.50
G5RV 1/2 SIZE HF MULT1BAND HF ANTENNA (INC POST)
£15.00
GR5RV FULL SIZE MULTIBAND HE ANTENNA (INC POST)
£17.50
G5KW/W3DZZ 7.1 MHZ TRAP DIPOLE ASSY. S0239/COAX FED
£23.50
. G5KW/W3DZZ 7.1 MHZ MULTIBAND AS ABOVE. BALANCED FED
£22.50
G5KW/W3DZZ 7.1 MHZ 2X TRAPS. FOR SELF ASSY. ANT
£9.95
Hundreds of other types of base and mobile antennas in stock
JAYBEAM, TONNA, MET, SUN. HOXIN, POPULAR MODELS IN STOCK..
Appointed dealer for N1SJ. Butternut Products.
•RAYCOM PRODUCTS'
NEW ICOM TYPE COMPATIBLE NICAD PACKS,
EMPTY CELL CASES AND DESK TOP CHARGER
A new range of professional Heavy Duty long life nicad packs, imported
from the USA, available exclusively at RWC.
10AF 10V 800 mAH LONG LIFE, ICOM EQUIV BP5/8
£55.00
12AF 12V 600 mAH LONG LIFE, ICOM EQUIVALENT BP7 £52.50
(Both above umis fa use in ICOM BC30/60 OR RAYCOM NC580)
MT1 EMPTY Ceil case tor self assembly of up top lOx Nicads tor a cost
effective replacement fa packs such as BPS etc. there is ample room fa a
DC jack, c/w instructions £8,50, AA NICADS tagged 1.2V 500mA Nicad
cells for above £1.60. NC580 Desk-Top charger fa all Icom type Nicads
above 400mA, two charging positions 50mA & 80mA 14hr charge £39.50
Trade and Dealer enquiries welcome. Call for rrxxe details.
P&P £2.50 per ader
MOD KITSRWC MOD KITS. ANNOUNCEMENT
We apdoqize to customers waiting fa various
mod kits, "supplies of crystals and components
are inconsistent and demand fa kits varies, so
there is occasionally a delay befae we can send
your kit of parts, please be patient. Rome was
NOT built in a DAY! Kits still available.
SANYO LC7137 SYNTHESIZER CB-10MTRS,
LCL/ONT CB-10MTRS. FT757GX MK1 FAST
TUNING MOD, STORNO CQM713 PMR-2MTR
KIT. PYE A200 E-BAND 50MHZ KIT, call fa
technical details, prices and delivery.
WANTED DEAD OR ALIVEV
Your used equipment. We also otter a
very comprehensive range of guaranteed used equipment, e.g. Amateur
band transceivers, SW receivers, scanning receivers, PMR and accessories.
As far as we are aware we are the only
company in the UK to offer a bi-weekly
computerized used equipment list and
special offers list.
Send a large SAE for copies.
ALL USED EQUIPMENT CARRIES
\3 MONTH WARRANTY
m
KAY WITHERS COMMUNICATIONS LTD
Manufacturers, Importers and Suppliers of World Famous Communications Products
584 HAGLEY ROAD WEST,OLDBURY, WEST MIDLANDS B68 OBS
021-421 8201/2/3. VODAFONE 0836 504587. PRESTEL MBX 214218216 FAX 021 421 2468
Amateur Radio. Business Radio. Radio Telephones. Sales. Service Accessories and Antenna Systems.
Ordering Information: For fast delivery please order by Telephone, Telex or Fax. or send cash/cheques/drafts by post. Ail
Credit/Charge cards accepted. £1000.00 Instant Credit available subject to status, we also offer our RWC Chargecard. Please call for
further details and information. We do NOT advertise products that are not normal stock items. All prices correct at time of going to
press. However, prices subject to change without prior notice. E&OE.
★ WE WILL MATCH OR IMPROVE ANY GENUINE ADVERTISED PRICE ★
A<ifvy I cnffigflS RJMm o>| RWC
Fast Mail
| jjrsrj jj^
iraiicoMi
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CONTENTS
VOLUME 5 IVJ012 DECEMBER 1987
Editor
Dave Bradshaw, G1HRT
Deputy Editor
Dave Bobbett, G4IRQ
Technical Illustrator
Jerry Fowler
Advertisement Manager
Christopher Harris
Classified Sales Executive
Sue Curtis
Published by:
Argus Specialist Publications Ltd
Distributed by:
SM Distribution Ltd
Printed byAdlard & Son Ltd, The Garden City
Press, Letchworth, Herts SG6 US
Design by:
ASP Design Studio
Editorial and Advertising address:
Ham Radio Today
ASP Ltd
1 Golden Square
London W1R SAB
Tel: 01 437 0626
(please mark your letter for the
appropriate department)
Subscriptions and back-issues:
Ham Radio Today Subscription
Dept, Infonet Ltd, 5 River Park
Estate, Berkhamsted, Herts
HP4 1HL.
Tel: (0442) 48432
Subscription rates;
UK £15.60, Europe £20.10,
Middle East £20.30, USA $30,
Far East £22.00, Rest of world
£20.60. Airmail rates on request
ARGUS Member of the ||—
j
PRESS Audit Bureau || ABC B
GROUP 0f Circulation
Ham Radio Today Ls normally published
on the fbrst Friday in the month preceding cover date. The contents of this publication including all articles, designs,
plans, drawings and programs and all
copyright and other intellectual property
rights therein belong to Argus Specialist
Publications Limited. All rights conferred by the Law of Copyright and other
intellectual property rights and by virtue
of international copyright conventions
are specifically reserved to Argus Specialist Publications Limited and any reproduction requires the prior written consent
of the Company.© 1987 Argus Specialist
Publications Ltd.
All reasonable care is taken in the preparation of the magazine contents, but
the publishers cannot be held legally responsible for errors. Where mistakes do
occur, a correction will normally be pullished as soon as possible afterwards. All
prices and data contained in advertisements are accepted by us in good faith as
correct at the time of going to press.
Neither the advertisers nor the publishers can be held responsible, however, for
any variations affecting price or availability which may occur after the publication has closed for press.
HAM RADIO TODAY DECEMBER 1987
REGULAR
COLUMNS
LETTERS
Has the RSGB highjacked 50MHz for data?
RADIO TODAY
Latest news and a visit to the Oxford HF Convention
17
22
RADIO TOMORROW. . .
Prestigious engagements for the communications conniosseur!
METREWAVE
We look back at 1987 and conclude that it was a vintage year
CONSTRUCTION
80M DIRECT CONVERSION RECEIVER PART 2
The final stages of our introductory receiver
19
TOP BAND BOX
Part 1 of our new 160m SSB transceiver project
HOMEBREW AERIAL TUNER
Make your mismatch disappear, turn the page, the answer's here!
REVIEWS
SONY PRO-80
See how the son of the AIR-7 fares on the air
53
24
DATONG HF CONVERTER
A viable way to listen to HF? We find out
28
STANDARD C500 - EXCLUSIVE REVIEW
The new cross-band full duplex portable gets the twice over
30
ALINCO ALR22 REVIEW
New name 2m mini-mobile — good enough to worry the big three?
45
FEATURES
MOROKULIEN . . .WHERE!
Give your travel agent a headache and work from an unusual location
44
WEINHEIM VHF/UHF RALLY
We discover that autumn is a fine-time to visit Weinheiml
56
FREE READERS ADS
CLASSIFIED ADS
HAM RADIO TODAY SUBSCRIPTION FORM
We've cut our UK rates by nearly 10%
ADS INDEX
59
' 63
66
Please mention HRT when replying to advertisements.
66
3
ICOM
Communications
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IC-575, 28/50Mhz Dual band multimode base station.
The ICOM IC-575 base station was developed to meet the demand for advanced communications for the recently acquired 6m band. Similar in appearance to the IC-275/475 2m and 70cm base stations, the beauty of
this new transceiver from ICOM is that it gives you the best of both worlds, 6 & 10m in one compact unit. The IC-575 covers
28-30Mhz and 50-54Mhz. Operating modes are SSB.CW, AM & FM. Power output is 10 watts (AM 4 watts) with a front panel
control to reduce output for QRP operations. A pass band tuning circuit narrows the I. F. passband width, eliminating signal
in the passband. A built-in notch filter eliminates beat signals with sharp attenuation characteristics.
Some PLIj systems have difficulty meeting the lockup time demands placed on them by new data
communications. This is why ICOM developed the DOS (Direct Digital Synthesizer) method. With a lockup time of just
5msec the DDS method allows the IC-575 to handle data communicatons such as packet or AMTOR. 99 programmable
memories can store frequency, mode, offset frequency and direction. A total of four scanning functions for easy access
to a wide range of frequencies, memory scan, programmed scan, selected mode memory scan and lock out scan. The
IC-575 has an internal A.C. power supply, but can also be used on 13.8v DC for mobile or portable operation.
Optional accessories available are the UT36 voice synthesizer, the IC-FL83 CW
narrow filter, SM7 external loudspeaker, HP2 communication headphones and SM8/SM10 desk microphones.
Other transceivers available m this range are: IC-275E 2m multimode 25w IC-275H 2m multimode lOOw,
^stiisssB* IC-475E 70cm multimode 25w, IC-475H 70cm multimode 75w.
You can get what you want just by picking,
up the telephone. Our mail order department
offers you free same day despatch whenever
possible, instant credit, interest free H.P.,
Barclaycard and Access facility, 24 hour
answerphone service.
Datapost
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IC-Z61, HF Transceiver with general coverage receiver
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ssssss as -
rrZZHSffifeaM-BKasa?*
amateur or broadcast.
w^nii annrpriate the electronic keyer, 500Hz filter and full
The C.W. operator Wl11
fhTah stability crystal is standard as is
ar
break m (40wpm) other filter
®
controi Twin VFO's and split mode for cross band
raode SeleCt
'c^nPaS .TeTTmS
lithium battery. The cell is uced
VC. COMP and SWR r|f
^ ^,he
32
^ lncJude the IC-SP20 external loudspeaker with
PL102 6kHz AM. filter and the EX 310 voice synthesizer.
suitable tor this ecuipmen.
Telephone us free-of-charge on:
HELPLINE 0800-521145.
Mon-Fn 09 00-13 00 and 1400-17 30
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ICOM (UK) LIMITED
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Dept HRT , Sea Street,
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Bay, Kent CT6 8LD.
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Tel: 0222 363859.
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SCHOOL CLOSE, CHANDLERS FORD IND. EST, EASTLEIGI
★
UNREPEATABLE
BARGAIN
FT726R
(2)
*
OFFER
£699 inc VAT
The world's best known UHF/UHF/satellite multimode base station is still making its mark with dedicated VHF DX'ers.
You choose the plug-in RF Modules for the bands you want to use. Up to three bands can be installed at once for cross-band operation or
pushbutton band selection, and RF Modules can be easily changed for even further expansion at a later date. The 70cm modules include GaAs
FET receiver preamplifiers.
v
Sideband selectable SSB, FM and CW are all included, with dual synthesized VFOs tuning 20Hz/step, plus an independent FM channel
tuning knob with standard channel steps of your area. All repeater operating functions are provided, including reverse shift and programmable
odd split memory. A speech processor is included for SSB, and for CW, an optional 600Hz narrow filter is available for selectable CW narrow
operation. An excellent IF shift system is provided, plus Yaesu's super IF width system; first time ever in a VHF/UHF transceiver!
All memories store mode (as well as band, of course), and can be scanned for busy orclear, pause or stop - even when on a different bands.
Programmable limited band scan between memories, and priority channel checking functions are also included. Every conceivable memory/
VFO data exchange function is provided, and all memories plus the VFOs are backed up by a lithium battery.
With the optional plug-in satellite IF unit installed, full duplex cross-band capability is provided, with independent tuning, mode selection
and indicators, and meter functions for transmit and receive. With just this rig and good antennas you have the finest amateur satellite earth
station available.
430/726 70 cms UNIT
£199 SAT/726 SAT UNIT
£59
50/726 6m UNIT
,
£249 21/24/28 HF UNIT
£269
The FT726R 2m base station, at only £699, is £240 cheaper than its nearest rival. Add 70cms at £199, you now have 2m & 70cms capability for less
than the oppositions 2m bases. ★
WITH 12 MONTH WARRANTY & FREE FINANCE AVAILABLE.
mm
zm
&
Tocnns
MOBILES
NOW ONL Y
-n,,
£199
★ Programmable step sizes (2.5KHz to 40KHz)
★ Priority function monitors call channel
★ Speed bitton for increased tuning speed
★ Full repeater splits with reverse facility
★ Programmable band scan limits
★ Lithium back up for memory & CPU
inc VAT
2m or 70cms COMPACT MOBILES (FM ONLY)
25/5W 0/P on 2m or 10/1W 0/P on 70cms
16 Programmable Memories plus Call
4 Scanning Modes Skip, Carries, Auto & Delay
Unique MMI (Man Machine Interface) System
Large Easy to Read LCD Display
90 DAY WARRANTY ONLY DUE TO AMAZINGLY LOW PRICE
BOTH ABOVE OFFERS ONLY AVAILABLE WHILST STOCKS LAST
LEEDS
CHESTERFIELD
BUCKLEY
JERSEY
N. IRELAND
BIRMINGHAM
AXMINSTER
SMC INorthem)
SMC (Midlands)
SMC (TMP)
SMC (Jersey)
SMC H. Ireland
SMC (Binningham}
Beg Ward & Co Lid
Nowell Ljne
102 High Street
Ural
27,
Pinfold
Lane
I
Belmont
Gardens
10
Ward
Avenue
504
Alum Rock Read
1 Weslern Parade
Industrial Estate
New
Whittington.
Buckley.
Clwyd
St.
Heiier.
Jersey
Bangor
Alum
Rock
West
StreeL
Leeds LS9 6JE
Chesterfield
Buckley
(0244)
549563
Jersey
(0534)
77067
County
Down
Birmingham
B8
3HX
Ax
minster
Leeds
(0532)
350606
Chest.
(0246)
453340
10-5
9-5 pm Mon-Set
0247 271875
(021327)
Devon
EX13(0297)
SNY 34918
9-5.30 Mon-Sat
9.30-5.30 Tuas-Sat
to-i Tues.
Sit Weds. Fri
Clowd Weds
9.00-5.00 1497/6313
Toes-Fri
Axminster
VISA
9.00-4.00 Sal
9-5.30 Tues-Sat
Southamptcn Showroom open 9.00-5 00 Monday to Friday. 9.00-1.00 Saturday. Service Dept open Mon-Fn 9 00-5 00
AGENTS: JOHN DOYLE. TRANSWORLD CQMMS. NEATH (0639) 52374 DAY (0639) 2942 EVE.
DAVID STENNING. D4JA. LOUTH D507 6D4367
JACK HcVICAR, SCOTCOMHS. EDINBURGH 031 657
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODA Y DECEMBER 1987
YAESU
mmunkations ltd.
\NTS. SOS 3BY TEL: 0703 255111 FAX: 0703 263507 TLX: 477351
THE BRAINS AND THE BRAWN
THE BRAINS OF THE OPERATION; THE FT-767GX
Features include 160 to 10 metre transmit, including WARC
bands. Optional plug-in modules for 6-melre, 2-metre and
70-cm operation. Receiver coverage from 100KHz to 30MHz.
AM FM, SSB, CW, AFSK modes built m. Ten memories that
store frequency, mode. Dual VFOs with one-touch sp it
frequency capability. Digital SWR meter. Digital RF power
meter. Built-in RF preamplifier. Adjustable drive level fromO
to 100 watts.
Up to 30 minutes continuous transmit (100% duty cycle).
Quick turnaround time from TX to RX for AMTOR, Packet, and
QSK CW. AGC slow/medium/fast/off selection.
—.
THE MUSCLE TO GET YOU OUT: THE FL-7000.
This solid state amplifier covers 160 to 15 metres, and includes a built-in power
supply, automatic tuner and lots of powerful operating features.
There's a fast turnaround time for break-in (QSK) CW, HF, packet, radio, and
AMTOR. Only 70 watts excitation for full output, and 1200 watts PEP input
power Automation antenna matching sensor turns off amplifier and rematches
tuner circuitry if SWR rises above 2:1. Hands-free automatic band change when
used with FT-767GX, FT-757GX or F-980. Connection to up to four antennas,
including automatic selection via optional unit.
FT767GX RRP £1550 inc VAT
FL7000 RRP £1600 inc VAT
A SELECTION FROM OUR CATALOGUE
ANTENNA ROTATORS
£78.00
Bell type twist switch control
KR250
£125.00
Bell type turn push rod
AR40
£169.00
KR400RC Bell type 360 deg. round meter
£149.00
Bell type 5 position pre-select
AR50
£219.00
Bell type meter readout
CD45
£219.00
Bell type 350 deg. round meter
KR600RC
£699.00
Bell type digital readout
HDR300
£325.00
KR800SDX Bel! type 450 deg variable speed
£368.00
KR1000SDX Bell type 450 deg. variable speed
£445.00
KR2000RC Bell type heavy duty round meter
£445.00
Bell
type
meter
control
+/90
deg.
KR200
Bell type meter control +/-180 deg. £139.00
KR400
£149.95
Elevation meter calib. +/- 90 beg,
KR500
£259.95
Heavy duty version of KR500
KR500B
£279.00
Azimuth/elevation dual control
KR5400
£339.00
KR540OA Azimuth/elevation computer control
£389.00
Azimuth/elevation heavy duty
KR5600
KR5600A Azimuth/elevation HD comp. control £389.00
£275.00
Intel!- i/face KR5400A/KR5600A
KR010
ROTATOR HARDWARE
£10.18
Ubolt clamps AR22/AR40 std.
50425
£16.68
Ubolt clamps CD45 etc. heavy duty
50463
£19.95
Rotary bearing 1 Ve" mast
KS050
£29.95
Rotary bearing 2" mast
KS065
£16.95
Rotary
bearing
form
KR400/KR600
KC038
ROTATOR CONTROL CABLE
RC5W
5way for KR400RC etc
per mtr. £0.48
RC6W
6way for KR250/400 500 etc
pn mtr. £0.66
RC8W
8way lor CD45/KR20O0RC etc. per rnlr. £0.7Z
Carnage on rotalcr cable £1.90 up lo 20 metres, over 2(5 metres
£2.65.
Prices subject to fluctuation
FREE FINANCE...
On many regular priced items SMC offers
Free finance {on invoice over £120) 20% down and the
balance over 6 months or 50% down and the balance over a year.
Vou pay no more than the cash price!
Details of eligible items available on request.
HAM RADIO TODAY DECEMBER 1987
VHF/UHF MOBILE ANTENNAS
HAND PORTABLE ANTENNAS
£6.33
6 section telescopic with PL259
6P2T/PL
£7.94
6P2T/BNC 6 section telescopic with BNC
£13.50
Tele. 2 metre 1/2 Wave with BNC
T144H
£6.33
Helical for 2 metres with PL259
2h/PL
£7.94
Helical for 2 metres with BNC
2H/0NC
£9.75
70cm 1/2 Wave with BNC
HS430
£9.75
70cm 5/8 Wave with BNC
HS430S
MOBILE WHIPS
£18.54
70Mhz 3/8 Wave 5.3ft.
370F
£3.15
144Mhz 1/4 Wave 1.6ft.
2QW
£[email protected]
144Mhz 1/2 Wave foldover 3,5ft.
2VF
£21.15
144Mhz 7/8 Wave foldover 5.7ft.
78F
£18.64
144Mhz 7/8 Wave ball adjust 5.6ft.
78 B
£21.15
144Mhz 7/8 Wave short whip 4.7tt.
78SF
£24.10
144Mhz 8/8 Wave 6.5ft.
88F
£29.37
432Mhz 2x5/8 Wave foldover 3.1ft.
258
£32.80
432Mhz 2 section colinear 6db
268E
£33.73
432Mhz 3x5/8 foldover 4.7ft358
£37.75
144/432Mhz 6/8+3x5/8 Wave
7QN20X
MOBILE BASE MOUNTS
£14.25
SMCGCCA Gutter clip c/w 4m cable + PL259
£6.90
SMCS0CA Cable ass. S0239 4M cable PL259
£7.20
SMCS0CAL Cable ass. S0239 6M cable PL259
£12.25
SMCTMCAS Trunk mount c/w 6M cable PL259
£16.85
Heavy duty truck mount c/w 5M cable £12.75
HDTMCA
Mag Base c/w 4m cable PL259
SOMM
£6.00
SMCSOWM Adj. angle wing mount base
£6.45
Gutter clip adjust angle for SOCA
SMCGCD
£11.50
Bumper strap stainless band
BSD
Carnage extra on all the above.
S.H.C. SERVICE
INTERLINK DELIVERY...
FREE
Free Interlink on maior cquiptnenl.
Small items. Plugs. Sockets, etc. by post £1-75. Antennas.
Cables. Wire & larger items. Roadlme up to £5.00.
Interlink delivery available, upon request, for items other
than radios, from £7.30 depending on weight.
Same day despatch whenever possible.
VHF/UHF FIXED ANTENNAS
JAYBEAM 2 Mttre
Halo head only
HO/2M
Halo with 2ft. mast
HM/2M
Ground plain folded radiator
U6P/2M
C5/2M MK2 Vertical Colinear 4.8dbd
Vertical Colinear 4.3dbd
LR1/2M
Vertical omnidirectional
IR2/2M
5 Element Yagi 7.8dbd .
LW5/2M
8 Element Yagi 9.5dbd
LW8/2M
LW10/2M 10 Element Yagi 10.5dbd
LW16/2M 16 Element Yagi 13.4dbd
PBM10/2N 10 Element Parabeam 11.7dbd
PBM14/2M 14 Element Parabeam 13.7dbd
4 Element Quad 9 9,4dbd
Q4/2M
6 Element Quad 10.9dbd
Q6/2M
5 over 5 slot ted Yagi lO.Odbd
D5/2M
8 over 8 slot fed Yagi ll.ldbd
D8/2M
5 Element crossed Yagi 7.8dbd
5XY/2M
8 Element crossed Yagi 9.5dbd
8XY/2M
10 Element crossed Yagi 10.8dbd
10XY/2M
2 Way harness circ. polarisation
PMH2/C
PMH2/2M 2 Way harness for 2 Metres
PMH4/2M 4 Way harness for 2 Metres
SMC VHF/UHF ANTENNAS
Discone 100-440Mhz low VSWR
GDXA
Discone 80-480Mhz low VSWR
GDX1
Discone 50-480Mhz low VSWR
6DX2
Discone 65-520Mhz receive only
VHFL
2 Metre colinear 3x5/8 7.8db
GP23
2 Metre colinear 2x5/8 6,4db
GP144W
2 Metre colinear 2x5/8 6.4db 100W
GPV5S
2 Metre ground plain 100 Watt
GP2M
70Cms colinear 3x5/8 6.8db
GP432X
70Cms colinear 14 step co-ax lOdbi
GP714
70Cms colinear 3x5/8 base antenna
358FG
£7.13
£8.34
£15.41
£89.70
£35.71
£28.18
£17.31
£21.85
£28.23
£42.44
£55.20
£68.08
£35.31
£46.28
£30.82
£42.38
£33.41
£43.01
£53.95
£12.82
£14.15
£35.25
£46.35
5.75
£69.65
£22.50
£64.25
£42.00
£45.50
£23.65
£47.50
£88.20
£57.75
GUARANTEE
Importer warranfy or Yaesu Musen products.
Ab'.y staffed and equipped Service Department.
Daily contact with the Yaesu Musen 'actory.
Tens of thousands of spares and test equipment.
Twenty-five years nf professional service.
• 2 years warranty on regular priced Yaesu products.
please mention HRT when replying to advertisements. 73G4NXV
7
iKv
i
SITUATED AT SOUTHERN
HF TRANSCEIVERS
1995.00 (—)
Kenwood TS940S
Kenwood TS930S
1695.00 {—)
Kenwood TS440S
1138.81 (—)
Kenwood TS430S
748.00 (—)
1098.00 (—)
Kenwood TS830S
Kenwood TS530SP
748.00 (—)
1785.00 (—)
Yaesu FT980
Yaesu FT757GXII
969.00 (—)
Yaesu FT767GX
1550.00 {—)
loom IC735
949.00 (—)
Icom IC751A
1465.00 (—)
STATION ACCESSORIES
Drae V.H.F. wavemeter
30.25 (1.50)
A.K.D. V.H.F. wavemeter
24.95 (1.50)
Yaesu FF501DX low pass filter
30MHz IkW
37.50 (2.00)
KenwoodLF30A low pass filter
30MHz IkW
32.26 (2.00)
1 Adonis AM303G desk mic with pre-amp 53.00 (2.00) j
Adonis AM503G desk mfc with
compression
69.00 (2.00)
S.M.C. Polar-phaser II 2 metre
49.00 (2.50)
S.M.C. Polar-phaser II 70 cms
69.00 (2.50)
ANTENNA TUNER UNITS
Yaesu FRT 7700 Short wave listening
Yaesu FC 757AT
Kenwood AT 230
Kenwood AT 250 auto
59.00 (2.00)
349.00 (—)
208.67 (2.50)
366.00 (—)
ANTENNA SWITCHES
Welz CH 20N 1300MHz N skts
Welz CH 20A 900MHz S0239 skts
SA 450N2-way diecast 500MHz N skts
SA 450 as above bu S0239 skts
DRAE 3 way N. skts
DRAE 3 way S0239 skts
CS 4 4 way B.N.C. skts. 1500MHz
49.00 (1-50)
29.95 (1.50)
26.99 (1.00)
19.49 (1.00)
21.81(1.00)
16.96 (1.00)
30.39 (2.00)
■
n
dhursir
electronics
|
END OF M23-EASY ACCESS TO M25 AND SOUTH LONDON
£ (c&p)
2.M. TRANSCEIVERS
£ (c&p) ■ KENWOOD ACCESSORIES
KenwoodTH 21E Handheld
189.00 —)
MC 50 Desk Microphone
46.08 (2.00)
599.00 —)
KenwoodTR 751E 25W multimode
MC
60A
Desk
Microphone
with
Pre-amp
88.22
(2.00)
940.00 —}
KenwoodTS 711E base station
MC 55 Mobile Michrophone with Control
KenwoodTH205E Handheld
215.26 —)
Box
52.67 (1.00)
252.13 —)
KenwoodTH215E Handheld
MC 40S Up/down Hand Microphone
317.30 —)
Kenwood TM221ES 45W Mobile
6
pin
19.07 (1:00)
Yaesu FT 29011 Portable multimode 429.00 —)
MC 43S Up/down Hand Microphone
Yaesu FT 726R base station (70cm
8
pin
22.22
(1.00)
999.00
optional
SMC 30 Speaker Microphone TH21
28.31 (1.00)
253.00 —)
Yaesu FT 23R Handheld + FNB10
LF30A
Low
Pass
Filter
1KW
32.26
(2.00)
—)
309.00
Yaesu FT21 1RH 45W FM mobile
FFSOIDXLow Pass Filter
37.50 (2.00)
225.00 —)
loom IC 2E Handheld
SP
40
Mobile
Speaker
21.06
(1.00)
—)
269.00
Icom IC 02E Handheld
HS 7 Miniature Headphones
15.80 (1.00)
359.00 —)
icom IC 28E 25W mobile
HS
6
Ultra
Light
Deluxe
Headphones
24.36
(1.00)
Icom IC 274E inc. PSU base station 1039.00 —}
HS 5 Deluxe Headphones
37.54 (1.00)
Icom IC 3200E 2m/70cm F.M. mobile 556.00 —)
HMC 1 Headset with Vox TH21 etc. 32.91 (1.00)
239.00 _)
Icom Micro II Handheld
VS 1
Voice Synthesizer Module
32.26 (1-00)
AD 1 Screwed Phono to BNC
Adaptor TH21E/41E
3.85 (0.50)
GOODS NORMALLY DESPATCHED
IF 232C RS232 Interface TS711/81 IE/940/
WITHIN 24 HPS.
440/R5000
72.89 (1.00)
- PRICES CORRECT A T TIME OF G 01NG
TO PRESS
ANTENNA BITS
£ (c&p)
APPROVED
- E&OE
Hl-Q Balun 1:1 5kW P.E.P. •
12.50 (1.00)
KENV/OOD
Bricomm Balun 4:1 IkW
11.20 (1.00)
Bricomm 7.1MHz Epoxy Traps (pair)
9.95 (1.50)
DEALER
Self Amalgamating Tape 10x25mm
4.25 (0.75)
MAIL ORDER
T-piece Polyprop Dipole centre
1.60 (0.25)
Small Ceramic egg insulators
0.65 (0.20)
AND RETAIL
Large Ceramic egg insulators
0.85 (0.20)
VtSA
V.H.F. SCANNING RECEIVERS
Icom ICR7000
957.60 (-)
Yaesu FRG960M
509.00 (—)
WE ALWAYS STOCK
A.O.R. AR2002
487,30 (—)
Sony
Air
7
249.00 (—)
A GOOD SELECTION
V.H.F. SCANNER ACCESSORIES
OF FREQUENCY
A.K.D. HFC1 HF Convertor
49.00 (1.00)
Revone Discone Antenna 30-50 OMHz 31.50 (2.00)
REFERENCE BOOKS
Icom AH7000 Antenna 25-130MHz
82.00 (3.00)
-BREOHURST ELECTRONICS LTD HIGH ST, HANDCROSS, W. SX. RH17 6BW (0444) 400786Enterprise
w*adio
PPLI CATIONS
LTD.
The BP20 is a high quality
professional audio filter with an
amatuer price tag. Operation is a
Fpiece of cake so why notcuttheQRM
' and get yourself a piece of the action!
No other state-of-the-art filter comes
close to the outstanding
performance of the BP20. Twenty
orders of filtering gives an incredible
80dB of stopband attenuation that
really cleans up the signal while the
CAextremely flat passband & freedom
ringing is a sheer delight for CW &
RTTY. Unlike others, a night school
course is not required to operate the BP20.
Just select the mode & trim the bandwidth. Whats
' more, it connects in seconds to any equipment with
the lead provided. Hearing though is believing as we
found when using with a professional receiver costing
' several thousands of pounds. The results were fantastic
so think what the BP20 could do for you. The BP20 uses
very little current & will work on any dc supply from 12to
26 volts. Only one other product can give as much
enjoyment & that of course is our Microreader, a self
contained CW/RTTY decode & display system for the HF
bands.
Prices BP20 £94.50 Microreader std £119.95
Microreader inc. tutor £134.95
All prices include VA T/P&P all units with full 12
month guarantee.
8,
o?
5r
S irif
BO
To order or for more information contact
Bill Green G8 HLZ
E.R.A. Ltd.,
■
Unit 26, Clarendon Court, Winwlck Quay, E.
1
Warrington WA2 8QP
Tel:(0925) 573118
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODAY DECEMBER 1987
CAP CO ELECTRONICS LTD
63 Hallcroft, Birch Gre«n
Skelmersdale, Lanes
WN8 608
T :0695 27948
rBRCPj
'Announcing Another Fantastic*
NEW PRODUCT
Stay Tuned Forever with a CAP.Co ATUOnce Bought - Never Replaced
rife, w
H- J
antenna tuning units
SPC-300D IKw p.e.p
SPC-3000D 3Kw p.e.p
NEW PRODUCT - VHP A.T.U.
SPC-100 1Kw p.e.p
CAPACITORS
CAP-25S S.GANG 250
CAP-25T T.GANG 250 p«d
CAP-10S S GANG 500
CAP-25D DIFF 500 pfd 8Kv 2.5mm plstt tpsclng + 2.00 p A P
CAP^IS S.GANG 250
CAP^IT T.GANG 250 pfd
CAP-12S S.GANG 120012kv
pfd 4.5mm pli«« spacing + 2.50 p • p
ROLLER COASTER + 2.00 p&p
28 micro henries
BALUNS 4:1. 1:1 +2.00 p&p
Fully encapsulated
AERIAL KIT - 100 P&P
Clip-on Spreaders
TURNS COUNTER + 1 00 p&p
Digital
£225.00
£325.00
-_g gg + £2 p&p
p
S|i|
£,,-95
How would you like an aerial that out"Perfor"1®€' ®
full size Dipole at the correct height, atVer.tlcal\l®
good as a beam and only an 'S' point or two down
on a quad, does not need an AID, no, not even one
of ours? You would? Then read on.
This aerial works, at ground level, will flt y?1? ^
tiniest of gardens, in a flat or on a balcony. It15'dpaj
for Embassies, Governments Amateurs, Ships
large or small, Mobile & Portable. It covers 1 to 30
MHZ - Does not contain lossy traps or hidden
dummy loads - Has a band width from 3KHZ to
48KHZ depending on frequency in use the SWR at
the highest is 1.2 to 1 and 1 to 1 on most frequencies
- Will handle from 100 watts to 1KW continuous
depending on model used.
This is NOT a gimmick, not a toy, it is a real
Technological breakthrough, we kid you not.
Seeing and hearing will be believing
Til you dldnl tee our new lechnologlcel break^t
* through et Leicester It', a theme, but don I
mitt out. Send e SAB lor Into NOWI
_„
^5 j|
ALL OUR PRODUCTS ARE MANUFACTURED BY US AND ARE THE RESULT OF
PLEASE^DD^JOT^MIRCHASE''^FERION^C^IES HOWNO THAT Tgyf
r.s s,u
59
tl0
R
R
'
„ „ £ a?T E*S^^^
WE ALSO STOCK INLINE METAL COUPLERS O.TSp. FLEXIBLE COUPLERS £2.50
c99 ka
^
PLEAIE PHONE1A^Ov|SNUMBER FOR YOUR LOCAL STOCKIST.
lee Electronics
P+F
NEW HANSON SWR METERS
SWR3
3.5-30MHZ
200
Watts/50-150MHz
50
watts
34.00
Qumsns a 5-150MHz 1KW PEP with black light facility
■ ■ 34-00 (2.00)
(2.00)
FS500H This peak reading meter has RMS/PEP with follow/hold facility72
in ttu
range
1.8 to
-00 <Z-50'
Still Available
SWR15 Single meter SWR/Fleld Strength 3.5-150MHZ ,
. 9.77(2.00)
SWR25 Twin meter SWR/Power/Field Strength 3.5-150MHz .
19-00 (2.00)
UH74 SWR Power meter switchable HF/2M/432MHZ (10W)
5405/9001
with remote hesd
■ * em
rvni
52 50 /o
T435 VHF/UHF Twin Meter 2/20/120W
- (2-00)
WELZ PRODUCTS
SP430^144/430 dash Mount & Voltmeter
SP600 1.6-500MH2
SP825 1.8-1.3GHZ 2/15/150W..
SP10X 1.8-500MHZ 200W Pocket Size
AC38 3.S-30MHZ Coax ATU 200CW/400C PEP
- 49.50 (0.00)
1||-00
2.00
42.00 (u.uu,
-■ ■ ■ ^^-^95O0£L5P)^
EK150 Semi/Fully Automatic Electronic Keyer with Built-in Monitor'Tra0nns's'0,r5 ml
Relay Output 240VAC/120VDC
90.00 2.00
HK707 Straight Up/Down Keyer .... .......■■■■
"-I? > '
HK702 As HK707 only with a Heayy Marble Base
31.00 z.oo
HK740 Squeeze Keyer
"aiOO TSO
MK705 Squeeze Keyer
•
J50
MK702 Manipulator Key on Marble Base
31.00 ( .
BK100 Semi Automatic Bug Key
• ■ ■■ ■ ■
rr'Ji L -n
EKM-1A Morse Code Practice Oscillator with variable Tone
10.25 .50
ROTATORS
AR1002 Automatic Antenna Rotator
45.00 ,3 . 5)
AR2200 Heavy Duty Antenna Rotator
KR400C Mid to heavy Vertical Load 200KG 6 cor®
'Ai.
21900 550)
KR600C Heavy-vertical load 200KG Brake Torque 400KG/CM
219.00 b.ou)
400 EDGWARE ROAD,
LONDON W2
01-723 5521 Tlx 298765
HAM RADIO TODAY DECEMBER 1987
Normally 24hr despatch
but please allow 7 days
for delivery.
ANTENNAS
TA285
2M Colinear Base Antenna/70om Colinear
X50
Base Antenna 70/2
DPCP5
Base Antenna 80-10m
fiPL EL770H Mobile Antenna 70/2
POWER SUPPLIES
PX402
3A Continuous 4A Max 13.8VDC Fully Stabilized
EP2510
25A Continuous 30A Max 13.8VDC Fully Stabilized
DRAE
13.8VDC 12 Amps
DRAE
13.8VDC 6 Amps
AM303
AM503
AM803
FX1
202S
HW7
NORMAN
G4THJ
35.00 (8.0C
1ionnn ir not
98.00
8.00
29 5 8
00
-9 (
>
. 24.95 (4.50)
155.00 7.00
65 00 (4 5U,
- ■
Base mic SSB/FM Switch
Desk Compressor Mic as 803 with One Output.
Two levels of compression
As 503 with Meter & 3 Outputs
Swan Neck Fet mic with Control box
Flexible Neck Clip Mio with Control Box
Head Set Boom Mic for Yaesu/lcom/Tno
49.50 (0.00)
' SS
".so u.uuj
49.00 (1.65)
37.50 t.bs
2'-s0 (1.65)
LONDONS MOST ESTABLISHED DEALER IS PLEASED
TO ANNOUNCE THE NEW STANDARD C500 DUAL
BAND. - FULL DUPLEX - HANDHELD.
PROGRAMMABLE OFFSETS ON BOTH BANDS.
Possible frequency coverage 140-169/410-450MHz. we
use the importers workshop for our repairs and we can
supply most spares off the shelf.
FULL DETAILS TO FOLLOW.
NEAREST "rUBE:
EDGWARE ROAD
PADDINGTON
OPENING TIMES:
9.30am-5.30pm Mon-Fri.
10am-4.30pm Sat.
please mention HRT when replying to advertisements. 73G4NXV
9
General
Coverage
Receiving
Adaptor
Model PC1 adds50KHzto30MHz
Receiver Coverage to 2 metre All
Mode Receivers or Transceivers.
For sheer value for money there is
no better way of getting a superb
general coverage receiving system
Price: PC1 £129.37 inc. VAT
To order simply dial
0532 744822
or write with cheque or
postal order to
i
-
Dept HRT Datong Electronics Ltd., Clayton Wood Close, West Park, Leeds LS16 6QE
d
Access/Barclaycard welcome - Fast delivery service
Catalogue and data sheets on any product available free on request. Dial 0532 744822 (2 lines]
Are you receiving it?
MOTTO
Easy to understand
♦
Full programme details
♦
In-depth reviews
r
r5
K- : N
Interesting features
^WTf^F
TM£ WOBLO
fB Oh, . tOUMO
f. .*©010*
Questions answered
♦
and more***
Each month this magazine contains all you need to know
about Satellite TV-the latest news, hardware and
programme reviews, answers to often-asked readers'
questions, interesting features and a comprehensive
programme listing for the next month's viewing.
YOU CAN'T AFFORD TO MISS IT!
EACH MONTH WITH
OUT NOW AT YOUR LOCAL NEWSAGENT
Argus Specialist Publications Ltd., No 1 Golden Square, London W1R 3AB
w
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODAY DECEMBER 1987
Penetrate the four corners of the earthy fp^l^ATOR'
IN USE FROM VK7 TO VE7!
HERE'S THE SPECIFICATION...
* 3 elements on each band
* heavy duty 2kW rated
* Gain up to 8dB
* Broadband operation
* Stainless steel hardware
SWR less than 1.3;1
HERE'S
WHAT THE
beam and would 'ike to
1
VKy NOW "I have recen y
lt certainly outperforms the
advise you that I am extremely
VSWR is ower .
TH3JNR which I previously
pleased I am with the DX-33
2. G3AAE "This
un letter
ck n9'S ^impressed with the
antenna. On P® ' anrfj°?Derati0n it is just as impressive. I have used
quality of the hardware and ineoperation it is iu^i
h
, f om Dx
it on all three bands and hav ^
^rsro^rereMi^.
WESTERN ANTENNAS (Carriage & VAT inc.) ]
Price
£
Cal
402.50
C
P
0
Type
No
2 Jle Yagi Gamma matched 20; boom 546.25
1075 DX 7/2 2MHz
ele Yagi
40 boom 138.00
1076 DX 7/3 9MHz
RoSy2dtpole
forGamma
28.24,21matched
18 and 14MHz
126.50
1077 DX 51 10/80m Multi-band vertical plus 30m
103.50
1080 DX 6V Dipole 10/l5/20m 2Kw p.e.p.
184.00
1081 DX 31 2 element 10/15/20m 2Kw p.e.p.
270.25
1082 DX 32 3 element l0/15/20m 2Kw p.e.p.
356.50
1083 DX 33
2Kw
80.50
1084 DX 34 4 element
86.25
1085 DX 31/32 Conversion Kl DX-31 to DX 3
86.25
1086 DX 32/33 Conversion K DX-32 to DX
109.25
1087 DX 33/34 Conversion KitpX-33 to DX 4
161.00
1089 DX 103 3 element 10m Yagi
115.00
DX 33
34.50
Zl Sx 40K Converts D^^ImHz4^^0'6
92.00
3 Element 1
264.50
3 Bands
1^ S fvl »erfo gramma matched
316.50
1096 DX 24Q 2 ele quad 2, 10, 15 & 20m
920.00
inQ7 DX 26Q 2 ele quad 2, 10, 15, id «
1099 DX 7/14 2 ele 40m/6 ele 20m 50 boom
The ULTIMATE in DESIGN...the ULTI-MAST
PRICES (inc carr & Vat)
Ultimast UM-1 ■ • ■ ■ *
Reducer head, UHD
Rotor head. UHD-2
DB-1 Detachable base
o
"' zts1
—r o"poo"'' 'tii
""TmpossiC/e to gel MOBE smngtt'lo.LESS cost
so beware of cheap copies
thev may not have the correct materials.
mio'c IS
io thf
ORIGINAL iyimo
MAST... there
are copies!
OURS
THE OR/Of/VAi.
0ne.winch operation
Slim, unobtrusive
Telescopic and Till-over
For VHF and HF antennas
Self-supporting
^T^ofo^ersove'r 300' so resf assured that your 30' /s safe/
lUe/'tcrn Elcctronic/ tUH) Ud
<s
rooQ.oo
£1q 35
£34 50
"
SERVICES:
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TX-3 RTTY/CW/ASCII TRANSCEIVE
The high performance, low cost system
Split-screen, type-ahead operation, receive screen
unwrap, 24 large memories, clock, review store,
callsign capture, RTTY auto CR/LF, CW software
filtering and much more. Needs interface or
T.U.BBC-B/Master and CBM64 tape £20, disc £22.
Spectrum tape £35 inc. adapter board.
For VIC20 we have our RTTY/CW transceive
program. Tape £20.
RX-4 RTTY/CW/SSTV/AMTOR
RECEIVE
>000
This is still a best-selling program and it's easy to see
why. Superb performance on 4 modes, switch
• modes at a keypress to catch all the action. Text and
picture store with dump to screen, printer or
tape/disc. An essential piece of software fortrawling
the bands. Needs interface. BBC-B/Master, CBM64
tape £25, disc £27. VIC20 tape £25. SPECTRUM tape
£40 inc. adaptor board, the SPECTRUM softwareonly version (input to EAR socket) is still available
£25.
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TIFI INTERFACE Perfect for TX3 and RX4, it has 2stage RTTY and CW filters and computer noise
reduction for excellent reception. Transmit outputs
for MIC, PTT and KEY. Kit £15 (assembled PCB +
Cables, Connectors) or ready-made £25, boxed with
all connections. Extra MIC leads for extra rigs £3
each. State rig(s).
WORLD AND UK/EUROPE MAP LOCATOR Maps,
great circles, distances, bearings, contest scores.
Lat/Long, locators, NCR, hundreds of placenames.
BBC-B/Master, ELECTRON ONLY. Tape £10.
LOCATOR Distances, bearings, contest scores.
Lat/Long. locators. SPECTRUM, CBM64, VIC20
tape £7.
And for the BBC-B/Master,
ELECTRON, CBM64, VIC20.
SPECTRUM.
MORSE TUTOR 1-40 wpm. Learn by ear, practise
using random letters, figures, punctuation, words.
40 plain language texts supplied or type your own.
With learning guide, tape £6.
LOGBOOK Date, band, mode, call and remarks.
Instant callsearch. log printout. Tape £8.
c^SS-
VtvC-
ES
fi
RAE MATHS Unlimited practice and testing for the
exam calculations. Tape £9.
All BBC and CBM64 programs are available on DISC
at £2 extra.
Prices include VAT and P&P, 1st Class inland,,
airmail overseas, normally by return. Eire, C.I, BFPO
deduct 13%.
technical software (HRT)
Fron, Upper Llandwrog, Caernarfon LL54 7RF.
Tel: 0286 881886
El
please mention HRT when replying to advertisements. 73G4NXV
H
HAM RADIO TODAY DECEMBER 1987
MULTIMETERS
V' \/N>/
" /VIs
COMPACT
Spacesaver
ANTENNAS
AQ6 20, 2 Ele and 3 Ele
Our own unique
4 BAND, 6, 10, 15, 20 M
design that
AQ6-20 4 Ele !new:
WORKS
CLOSE COUPLED-HI 'Q'-CAPAC1TY HAT LOADED YAGI
jcuia features:
rcaiui
Special
Unique Altron fully sealed coils for max stability _
Resonant length elements for improved VSWR (1-1)
Selectively detuned for optimum performance and gain (no
gimmick quad needed)
i Easy trim spokes with lock nuts and spares
As reviewed by
i Minimized wind load and weight
G4HCL in HRT
i Double insulated elements
APR 87
Typical performance
PRICE + p&p i I I ^ ou (O.uu) t i aa.uut ■ ■
v, .
PRICES ARE INCLUSIVE OF VAT. TERMS. CWO. ACCESS, VISA. UK Mainland
WE DESIGN— WBMAKE— WE SELL DIRECT. You get best value
Callers w§|comeALLWELD ENGINEERING
Open Mon-Fri 9am-5
Sat 9am-12.15pm
Unit 6, 232 Selsdon Road
S Croydon CP2 6PL
Telephone: 01-680 2995 (24 hr) 01-681 6734
STOCK ITEMS NORM ALL Y DESPATCHED WITHIN 7 DAYS
Gfkit
Affordable
ifliM
o
£21.50
DM105
A meter to suit all pockets,
including the one that holds the
wallet! Full complement of
ranges: 2V — IkV DC,
200V-750V AC. 2mA-2A DC
current and 2k-2M resistance
range. Basic accuracy 0.5%.
Accuracy
A comprehensive range of
quality Multimeters at very
competitive prices
DIGITAL
All models feature full ranges, ZV: digit
0,5 in LCD, low battery indication, auto
zero and auto polarity, strong ABS
casing, 10 Amp range (except DM105),
overload protection. Prices from £21.50
to £52,50. Battery, spare fuse, test leads
and manual included with each model.
analogue
A choice of four meters with prices
ranging from £5.50 to £21.00. All
models include battery, test leads and
manual.
Please add 15% VAT to all
prices and 70p for post and
packing.
VISA
Phone or write for fuU
cata,09ue pr,ce £120 to
Cirkit Distribution Ltd.
Park Lane, Broxbourne, Herts EN10 7NQ.
Telephone (0992) 444111.
KW TEN — TEC
SMJ ELECTRONICS
Specialists in Semiconductors
£0.37 BD235
£0.28
zJsofs18—ritlr 2SC945
t0.M
MCZOZt.. £115
O-JJ 2SK33
CO£1.1140 BD241
£0.34
1.59 2SC2029
2N3773
£1-65
2SC1060
BD243
£030
£110 1042 2SC1061
CO.49
C0.74
2N3866
£1.27 BD244C
£0.33
2SCto.ll,
ra n 2SC2078
2SC20H6
M M 3N201
3SM0
2SA473
£2.26
BD245
£0,84
E0EOtl10 2SC1213
to
12
2SC2002
tt.M
3SK40
2SA564 ....
£0,59
60246
£0.75
2SC1301.
CO,74 2SC2097 £21.09 SSKK)
2SA608
£2.08
BD902
£0.51
£013
2SC131?
M.09
2502090
C19.25
3SK97
2SA673
£1.50
BF244
£0.39
£0 38 2SC1318
£022 2SC2t66
£0.95 40673
2SA678
CO.
13 BF245
00.29
£0£0 2031 2SC1384
2SC1359 .£0.27
£0.13 2SC2236
£0,22
BC107
2SA683
C0.07
BFY50
£0.25
2SC22t>0 £24,55 BC 108
2SA684
£0.14
BFY51
£0.25
OtU
2SC139y
£0,60
2SC231?
M.IS
BC1M
2SA699
£0.26
MRF237
£3.39
£0 13 2SC1B74
E0.15 2SC23I4
M.30 B0141
2SA733
CO.19 MRF238 £13.64
£0 26 2SC167f,
£0-14
2SC2320
£0.10
BC142
2SA966
.
CO
06
MRF450
£13.50
C0.80
2SC2395
£16-20
BC182
CO.10
2SC1678
2SA999
£0.10
MRF4b0A
£13.80
C0.10
2SC2539
E10
82 BC184
2SC1815
2SA10I2. £0,68
£0.06
MRF454
£22.94
CO-92
2SC3020
Et2.90
BC212
C0.11
2SC1909
2SA1015
£0.08
MRF455
£23
65
£3,41
250234
C0.46
BC214L
CO.25
2SC1945
2SB525
£0.06
TIP29C
£0.26
>
2S0235
£0.41 BC238.
e0.09
2SC1946 C12.37
£0.29
2SC380.
£0.12 T1F 30C.
!35 2SC1947'
..£4.29
2SD313
£0.56
BC639
.
.£0.27
2SC495£0.13
2SD325 - £0.48
£0.43 BC640
,C0.10 2SC1957, £0.66
£0.33
2SC536.
.42 TIP31C
T1P32C. .
£1 58 2SD330
BD131
£0.11
2SC1969 ..£1.52
£0.35
2SC710
D0132
£0.32 TIP41C- ...£0.36
2SD380.. ..£4.26
£0.09 2SC1970
2SC711... .£3.63
£0.29
BD135
£0.22
TIP42C.
£2.95
2SD471
2SC1971
2SC730.. . £0.09 2SC1972—
£0.38
£0.71
BD139
£0-22
TlPt20.
£8.25
250837
2SC828
£0.41 BD140
£0.25
..,£0.51 2SD880 .,.£0.23
2SC900-£0.27
2SC1973.
8D201
,
£0.33
£0.25 2SK1922SC930
£0.17 2SC2002
Active Rlter Boards
BOOKS
£5.00 a 10 695MHz active filter speaficalty designed tor the HAM
Screwdrivers Guide to CB
£5.00
mtemabonal and NATO 2000 type CBs. This board ,jla n
PLL Data Book
£3.00 significantly reduces image reception and cross r™^
Pnce 't Q
Cybernet Service Manual
£3,00 without affecting sensitivity.
Uniden Service Manual
Ikotim IGKHz bandwidth xtal fiHef suilable for most FM CBs. The litter greally reduces
modulation (bleedover) and is extremely easy to fit.
Integrated Circuits £1.90 LC7120..
TDA1010 -.£1.15
£2.75
RC4558.
£1.37
7805
£2.50£0.55TDA101
£3.81
£3.26
S042
7808 .. - .£0.40
£0.38 HA1377..
HA1388-,
£2.28
S121
TA7061
£0.76
TDA1020£2.54 LC7130..
LC7131
£3.89
7812
£0.39
HA1392.
£2.89 TA7120
£0.48
TDA1510,
£2.72 LC7132..
7815
£0.37 HA1394
£3-12
£0.53
TDA1512
£2.55
LC7137
.,£2.77
TA7130
£0.74
7818
£0-59
HA1397...
£0.98
TOA2002
£2.68
LM324
£0.45
TA7204
£1.81
AN240£1-28 HA1398.
£0.91
TDA2004
£1.15
TA7205
£1.19
UM386
AN6551...
£0.73 LA4102
LAI 230
£1.22
TDA2005
£1-65
£1.85
TA7217
£0.84 M5n02
AN7131
£1-37
£1.22
TOA2O20
£1.81
£1.86
TA7222
£0.94
M51513
AN7140
£1-05
LA4112
£2.06
TDA2030
£1£0.7930
£1.94
TA7227
£0.58
M51515
AN7178
£2.95 LA4140
£2.08 TDA2611
£1.84 TA7240
BA402
£0.59 LA4201
£1-19 M61517 ,
£1.96 UPC 1028 £0 95
£0.99 TA7241
BA521
£1-55 LA4220
£1-41 MB3712
£1.93
UPC
1032
£0.73
£2.06 TA7270
BA656
£1.10 LA4250
£2-23 MB3730
UPC1156
£2.05
£1.94 TA727t.... £1.93
CD4O01
£0.28 LA4400
£2.59 MB3756
£1.96
UPCl
181
£0.91
£4.12
TA7274
CD4008
£0.89 LA4420
£1.32 MB8719
£0.66 UPCl 182 £1 04
CO.48 TA7310
CD401t
£0-11
LA4422
£1.13
MCI723
£0.99
UPCl
185
£161
£2.11
TA75902
CD4049.
£0.25 LA4440
£1.83
MC3357
£1.38
UPCl
186 £0.71
£1.90
TBA800
CD4066.
..£0.34
£0.49
UPC1230
£1.80
El-71 MC3359
MM55108N £2.33
£3.00 TBASIOT
CD40G9
CO-18 LA4445
LA4460
£6.60
UPD658
HATSOOl. .£1.33
£2.16 LA4461
£1.71
TC9106~.
£4.38 UPD2816 E1.65
£5.34
HA1366W....
LB1405 .
£0.97 NESS?
PLL02... feel treetBSI.
£7.59
TC9109
.
to contact us with your requirements. All prices are
bame y ^
orders under £10.00. All pneesare exclusiveOl VAT^
All mailL.'der lo:- SSSlatelord Road, EDINBURGH, EH111PB. Callers WelconK.TEL: 031 337 6950/031 337 2446.
HAM RADIO TODAY DECEMBER 1987
CENTURY
—
22
A TOP OF THE RANGE WINNER
A 50-watt, 6-Band CW Transceiver
that combines excellent performance, Reliability
Simplicity of operation, and low cost.
WSmM
,
© i
15 S »
* Full Break-in (QSK)
* 6Pole Variable Audio Filter
* Full Band coverage — 3,5,7,10,1,14,21,28,0—28, 5MHz
* Total Solid State
* Linear Crystal Mixed VFO
* Sidetone, adjustable for volume and pitch * Receives CW and SSB
* SOwatts input
* Receiver sensitivity, 0.5uV. typical
* Offset receiver Tuning
* Operates on 12VDC
For further information on the above, together with THE
CORSAIR II, THE ARGOSY II, KW TRAP DIPOLE AND TRAPS,
ATU's KW BALUN and ANTENNAS please contact;
KW TEN-TEC LIMITED, Vanguard Works, Jenkins Da e,
Chatham, Kent ME4 5RT.
Telephone 0634.815173
HP & CREDIT CARD PURCHASE FACILITIES AVAILABLE.
please mention HRT when replying to advertisements. 73G4NXV
13
St-"?
jiEvnon Professional Series
HIGH QUALITY BRITISH MADE PRODUCTS
[MSi TM1000
TRANSMATCH
1KW All Band ATU
Freq: 1-8 - 30 Mhz
Power: 1 KW P.E.P.
V
ibropleY
'The Oldest Name In Amateur Radio"
£139
+ £5 p&p
STAR
BUILD YOUR OWN HIGH POWER ATU
WITH OUR RANGE OF ATU COMPONENTS
RC26 Roller Coaster 1KW 3(hiH
£24 +£1 p+p
TCZ50 250 pF Var. Capacitor 1KW
£19.93 +£1 p+p
TC500 250 + 250 pF Ganged Variable- IKw
£28.00 +£2 p+p
TC48 Turns counter for RC26
£12.95 +£1 p+p
Pre-drilled empty case for above
£26.00 +£3 p+p
MASTERKEY
METEOR SCATTER
KEYER
NOW AVAILABLE
SEND SAE FOR
DETAILS
U.H.F. REMOTE
ANTENNA SWITCH
(For masthead mounting)
Freq: DC - 1.2 Ghz
Power: 150 Watts
Insertion Loss: 0.19 dB at 900 Mhz
Connectors: Green Par 'N' Type
£59.95
ALLOWS SELECTION OF 2 ANTENNMS FROM 1 COAX FEEDER
H.F. REMOTE
ANTENNA SWITCH
(For masthead mounting)
Now you can switch between two
HF Antennas on one coax feeder.
Freq: DC - 185 Mhz
RF Power: 400W P.E.P.
Insertion Loss; 0.15 dB at 144 Mhz
Connectors: S0239
Star Masterkey
CMOS Memoiy Keyer
£54.70
£95.00
/V
THE ORIGINAL
alfe
£39.95
50 Mhz LINEAR AMPLIFIER
WITH HARMONIC mm
SPECIFICATIONS
Supply: 13 V DC
Input Power: 2-5 Watts
Output Power: 15 Watts
'CSOBX
Freq: 50-52 Mhz
Power Gain: Approx 8dB
Deluxe
Std
£82.74
£70.54
THE IAMBIC
lV
£29.95
+ £1 p+p
29MhzFMR.F. POWER AMPLIFIER
WITH HARMONIC mm
SPECIFICATIONS
Supply; 13 V DC
Input Power: 1-4 Watts
mmss
Output Power: 25-30 Watts
ONE YEAR GUARANTEE
Deluxe
Std
Send an S.A.E. for further details and special
prices when you buy a S.M.K. and one of the
Vibroplex range.
Post and Packing on the above £3.00
£24.95
+ £1 p+p
189 LONDON ROAD, NORTH END,
PORTSMOUTH P02 9AE. Tel; 020S 662145
USE V0UR CREDIT CARDF0R IMMEDIATE DESPATCH
14
£78.09
£63.98
DEWSBURY
ELECTRONICS
176 LOWER HIGH STREET,
STOURBRIDGE, WEST MIDLANDS
Telephone: (0384) 390063/371228
Telex: 336712 SHELTN G
Fax: 0384 237367
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODAY DECEMBER 1987
SPECTRUM COMMUNICATIONS
MANUFACTURERS OF RADIO EQUIPMENT AND KITS
CB to 10m
CB TO 10 FM CONVERSION BOARD — The first available and still very popular.
Converts all mobile CB's with LC7136 or LC7137 or TC9119F PLL IC's to give 29.3129.70MHz. Board type SC29. Also for rigs with MM55108 1C use board type SC29F.
State rig type when ordering, £15. Or send your rig and we'll fit it £28 inc P&P. Base rigs
phone for details.
n
An HF band preselector and antenna tuning unit combined,
designed expressly with the S.W.L. in mind, covering 1.7 to 34
MHz complete in 6 bands. Will give an average gain of + 20 dB.
Why not send for full details?
m
'%
HAMGEAR ELECTRONICS
125 Wroxham Road, Norwich NR7 SAD. Tel: Norwich (0603) 405611.
MULTIMODE CB CONVERSIONS, send your 120 channel rig and we'll convert it to
give 28.01-29.70MHz in sequence without gaps. Colt 1200DX Hy gain 5, Multimode 2.
Major M360 Tristar 747 & 777. Concorde. Cobra 148, etc, £62 mc return P&P. Jumbo &
Excaiibur 1200, £65. 80 Channel rigs Stalker 9F DX & Major M588are modified to give
28 41-29.70MHz in sequence without gaps. £55 inclusive. 200 channel rigs are
converted to give 28.00-30.00MHz or 28.00-29.70MHz as required, super Hy gam 5.
Lafayette 1800, Super Star 2000, £45.50 inclusive, Noto 2000, £52.50, Super Star 20005x40CH £70. Colt 1600, £65.50.
2,4 and 6m EQUIPMENT
TRANSCEIVE CONVERTERS, simple board 500mW RF output. 25mW to 50mW 10m
drive Linear all mode operation. Low noise receive section on all versions. TypesTRC
2-10, TRC 4-10, & TRC 6-10. PCB kit £39. PCB built £54. Boxed kit £54, Boxed built
£83.25.
TRANSCEIVE CONVERTERS, two board versions 2.5w RF output, has generous
internal bandpass and harmonic filtering. Multimode, and low noise on receive. Types
TRX 2-10H, TRX 4-1 ON, TRX 6-10H- PCB kits £44.75, PCB's built£62.25, Boxed kit£60.
Boxed built £99.50.
VAT & P&P INC PRICES
Delivery within 14 days subject to availability. 24 hr answering.
UNIT B6, MARABOUT INDUSTRIAL ESTATE,
DORCHESTER, DORSET. TEL: 0305 62250
Fresh stocks again secured at
this
SPECIAL PRICE
>
£39.95
NEW AUTOMATIC ANTENNA ROTATOR - Aerial Techniques introduce
their new automatic, economical rotator system for improvement of
radio and television reception. Ideal for DXing and domestic use (pull in
alternative out of area 1TV regions), the full mount rotator accommodates ALL types of TV & FM aerial, large or small, having 192 lbs/in of
motor torque. The system consists of two major components, the
automatic control box and the rotor head unit, the vertical carrying
capability of the latter is 45kg. The additional Support Bearing may be
used for heavier load applications (up to three aerial arrays may be
employed, depending on size). The attractively styled Control Consol
features continuous indication of beam/aerial heading, telling you the
aerials position at all times. Bracket for Rotator support mast up to
52mm (2" approx) in diameter, stub/rotation mast is up to 40mm (1 Vz"
approx) in diameter.
KINGROTOR Automatic Antenna Rotator and Control Consol (uses 3
core cable)
£39.95
SUPPORT BEARING for heavier load applications
...£13.95
YOKO Multisystem VHF/UHF 5" screen Television. System B/G {5.5MHz
sound) AND System L FRENCH standard (6.5MHz sound). Ideal for TVDXing and Sporadic-E monitoring, covers Band 1, 3 & UHF; 3-way
power, 12v DC (lead supplied), Dry batteries & Mains operation. (SAE
leaflet)
£89.95
(Carriage & Insurance on above TV £4.95)
'A TV-DXers Handbook' completely new and revised edition by Roger
Bunney, a must for ALL DX enthusiasts .
£5.95
We are the specialist aerial company for all installations - domestic,
- fringe, distribution and DX. Try our comprehensive and illustrated
Catalogue at 75p full of all the latest equipment, please include SAE with
any other enquiries.
All prices inclusive of VAT & Carriage. Delivery normally 7-10 days.
ACCESS & VISA Mail and Telephone orders welcome.
AiHIM fiGMQSIB h/r
11, Kent Road, Parksione,
I VISA
Poole, Dorset. BH12 2EH. Tel: 0202 738232.
HAM RADIO TODAY DECEMBER 1987
FARNBOROUGH COMMUNICATIONS
97 OSBORNE ROAD, NORTH CAMP,
FARNBOROUGH, HANTS
/ (Rp
Read the reviews in this issue
and then decide. Phone us for
( yuj//
_
, a quotation, and that little extra
Wy
Bj3[ICOM| service now, on 0252 518009.
V/
Stockist of Drae psu's, Jaybeam and Cue Dee
Antennas, Microwave Modules, Oskerblock SWR,
CDE, RSGB publications, quality cables, our own
TVI filters, Welz, Bencher, Mirage amps.
Open Monday to Saturday 10am-6pm
ACCESS + H.P. Available + BARCLAYCARD
Telephone: Farnborough (0252) 518009
R.A.S. (NOTTINGHAM)
G6XBH
G1RAS
G8UUS
Radio Amateur Supplies
VAESU
Tel: 0602 280267
V
Visit your Local Emporium
Large selection of New/Used Equipment on Show
AGENTS FOR:
ACCESSORIES:
F.D.K.
Well
RangeModules
DRAE products
sVnFw
Microwave
Ltaears and
ICOM
Adonis Mies
YAESU
Mutok Pre-Amps
ALINCO
Barenco Mast Supports
KENPRO
Agents for VODAPHOHE & CEIXNET
AERIALS: Tonna, Hatbar, Jaybeam, New Diamond Range of Mobile Whips
Bring in your secondhand equipment for sale
JUST GIVE US A RING
Monday: CLOSED Tuesday-Saturday; 10am to 5pm
3 Farndon Green, Wollaton Park. Nottingham NG8 1DU
Off Ring Rd, between A52 tDerby Road) & A6O9.0lkesTon Road)
POOLE LOGIC
49 Kingston Road, Poole Dorset BH15 2LR
BOOKS FOR CHRISTMAS
ARRL HANDBOOK (HARD BACK) £14.90 + £2.00 p&p
£6.90 + £1.00 p&p
ARRL ANTENNA BOOK
£7.75 + £1.00 p&p
ARRL ANTENNA COMPENDIUM
£4.75 + £1.00 p&p
AX 25
£7.40 + £1.00 p&p
EXP. SATELLITE HANDBOOK
£8.25 + £1.00 p&p
SOLID STATE DESIGN
FULL RANGE OF TONNA AERIALS.
RG 213 COAX
60p p/mtr + 5p p/mtr p&p
RG 58 COAX
25p p/mtr + 3p p/mtr p&p
300 "WIN (SLOTTED)
25p p/mtr + 3p p/mtr p&p
PHONE 0202 683093 FOR MAIL CDER
ACCESS & BARCLAYCARD ACCEPTED
please mention HRT when replying to advertisements. 73G4NXV
15
STOP PRESS IVEW PRODUCTS • STOP PRESS NEW PRODUCTS • STOP PRESS NEW PRODUCTS
/B.N.O.S.
electronics!
THE
ULTIMATE PARTNERSHIP
With the recent surge in interest in the lower VH F bands
the average amateur is looking around for new equipment on these bands. In what promises to be the
ultimate partnership BNOS have teamed up with Cue
Dee of Sweden to offer the highest quality equipment
available anywhere.
BNOS, of course, have always offered a five year
guarantee on all our linear amplifiers and the 4m/6m
range is no exception. The compact IP models for 6
metres incorporate many of our popular features which
offer peace of mind to the user. The LPM models for
both bands contain all of our user friendly additions
including the power meter and our famous overdrive
protection circuits.
LWeAR PIIUMP RCCATIW OUTPUT POWER
SO MHz 100 WATT
LtHEAH AMPLIFIER
As is usual with BNOS products the
LP50-10-50 LPIVI50-10-100 LPIVI70-10-100
specifications mean what they say.
50-54MHz
50-54IV1HZ
70-72IVlHz
Power is quoted in RMS and harmonic
AB1
AB1
AB1
BOOmW
BOOmW
BOOmW
outputs are kept incredibly low.
15W
1 5W
1 5W
Many black boxes produce terrible second and third harmonics and at six
10W
10W
row
metres these harmonics are even more
50 ohms
50 ohms
50 ohms
BOW
troublesome. The second harmonic of
100W
100W
13 8V 6A
13-8V12A
50 MHz is slap bang in the middle of the
13 8V 12A
broadcast FM band. BNOS's range of
1 2dB
12dB
1 2dB
1 2dB
low pass filters are designed to remove
harmonic problems without cutting out
1 5dB
I'BdB
1 OdB
1 OdB
the DX too. Fit a BNOS filter and the
next time there's a stateside opening on
6, you can rest assured that the bloke
next door can still listen to "The
Model Band Insertion Loss Harmonic Rejection
Non
Power Connectors
Archers".
2nd
3rd
Harmonic Handling
Cue Dee are the Aerial world's BNOS.
Rejection
They also can offer a five year guarantee
F50-L/U
50 Better than 0-5 50dB
75dB
75dB
250W
TThF
on their products because of the
FTQ-L/U
70
Better
than
0-5
50dB
75dB
75dB
250V\
UHF
superior construction of their antennae.
The aerials are made from the finest
F144-L/U 144 Better than 0-5 50dB
75dB
75dB
250W
UHF
Aluminium and tested to Sweden's
F144-L'N 144 Better than 0 5 50dB
75dB
75dB
2 BOW
N
stringent national regulations.
F432-L/N
432
Better
than
0-5
50dB
75dB
75dB
250W
The Cue Dee Duo is a combined yagi
N
with 5 elements on 4 metres and 6 on 6
Note Rejection Figures are typical and w.r.t. the wanted signal
metres. The Duo incorporates a factory
Frequency Range
Class of Operation
Minimum input power
Maximum input power
Recommended input
power
Output impedance
Output Power
Power Requirements
Pre-Amp gain
(typical)
Noise Figure
(Better than)
LP50-3-50
50-54MHz
AB1
BOOmW
5W
3W
50 ohms
BOW
13-8V 6A
6 metre Amps
LP50-3-50 Linear/Preamp
LP50-1 0-55 Linear/Preamp
LPM50-1 0-1 00 Linear/Preamp
Filters
175.00 F50-L/U
175.00 F70-L/U
235.00 F144-L/U
F144-L/N
F432-L, N
29.95
29.95
29.95
35.35
35.35
4 metre Amps
I.PM70-1 0-100 Linear/Preamp
235.00
CUE DEE ~Duo Antenna 5 elle on 4m & 6 elle on 6m 6dBd on both
bands
129.95
/B.W.O.&.
ELECTRONICS
76
adjusted gamma match so you don't
have to mess about tuning up like with
other aerials. The boom is strong 28mm
tube with a 1.5mm wall. Each element is
a big strong T2mm diameter yet the
overall effect of tubular section materials is to reduce wind loading by up to
66% over square-section aerials.
With a 5 year guarantee, 6db gain over a
dipole on each band and a preset
gamma match the Cue Dee Duo - like all
Cue Dee Aerials - is a fit and forget
product.
BNOS and Cue Dee - The Ultimate
Partnership.
IVl ii Lane, Stebbing, Dunmow, Essex, CM6 SSL.
Tel: 0371-86681
Tix: 817763 BNOS G
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODAY DECEMBER 7987
Letter of the month
Dear HRT, It seems that RSGB has
decided to use 70.4875 for a packet
link frequency, in violation of their
bandpian which allocates upwards of
70.425 to FM simplex only. (RAYNET
'reserve' 70.350/375/400!.
In real terms, with 25kHz spec
gear this means 3 channels
(70.425/450/475!, with 70.260 for
mobile use and the presence of a
digipeater 12.5kHz above the top
channel will effetively reduce this to
2. Four meters is not the barren
wasteland it seems. In the Dudley
area alone, significant numbers have
managed to get hold of 12.5kHz gear
and most frequencies, including
70.4875, are in regular use.
What I find totally unacceptable
is the fact that this 'rule-change' has
been 'sneaked through' without
reference to the membership and has
only been written up in the1 data
bulletins. Not in the general pages of
RadCom. There is a perfectly good
all-mode section of 4 metres so why
do RSGB choose not to use it?
1 have been a member of RSGB
for 17 years, as 1 regard it essential to
have a voice in the corridors of power.
Realising the shambles which would
ensue if the RSGB, for all its faults,
ceased to exist i have resisted the
temptation to resign over this
deviousness . so far!
D J Reynolds, G3ZPF
What — no fishphone!
Dear HRT, I studied with interest Paul
Hollands feature (HRT June 87) and
Lt Cdr DSE Howes subsequent reply
(Oct 87) with regard to events which
occured off the West Coast on 10th
September 1984 at 1335 pm.
I was the amateur who received
the distress call during a lunch break
and immediately contacted the
coastguard service via an emergency
999 call whereupon I acted as intermediary between the coastguard
rescue service and Paul and Dave —
the two amateurs in distress off the
coast of Arran. In the event the
incident ended on a happy note much
to everyone's delight, especially Paul
and Dave, and I headed back to work
with thoughts of Tony Hancock
competing for attention with the
HAM RADIO TODAY DECEMBER 1987
various dual carriageway signs.
On a more serious note I was
rather surprised to learn from the
authorities that there is no legal
requirement to have marine VHF
equipment installed in seagoing craft,
surely this situation is not only absurd
but tantamount to serious neglect in
maritime regulations. The DTI are a
responsible and very necessary
government body and must retrieve
this oversight at the earliest
opportunity.
Steve Adams GM4PGL
You may be interested to know that it
isn't just private boats which can be
non-radio; I was staggered to learn
recently that it is still legal for light
aircraft to fly with no radio facilities
on board. Obviously, multi-channel
radio for these applications isn't
cheap — but it certainly seems to be
high time that at least one or two
channel sets are made compulsory.
More on class B bands
Dear HRT, Perhaps M. Allen GAXIVIH
should step out of the trees for a
while and re-examine his viewpoint.
I do not know the original reason
for the instigation of a 'B' licence,
however it is regarded that it covers
VHF and above; if he does know
anything about radio theory (I for one
was required to learn a certain
amount prior to the RAE) he would
know that the VHF spectrum runs
from 30IVlHz-300MHz, perhaps a
justification in itself for allocation of
50MHz to 'B' licencees? Far from
being a 'smack in the mouth' for 'A'
licencees, surely it is a tribute to the
general operating expertise of the
'B's? It does seem to me that a great
number of 'A' licencees only looked
on the morse test as an obstacle to
be surmounted before being
unleashed upon an unsuspecting
world, promptly discarding their keys
in favour of wielding a microphone
and a Megawatt linear like the fourth
horseman!
1 shall, when work and time
allow, take the morse test to enable
me to use what I consider to be a
challenging and rewarding mode of
operation In the meantime 1 should
like to broaden my horizons by talking
to as many of my fellow amateurs as
possible, on as many bands as
possible; not narrow my viewpoint by
restricting the hobby to a minority —
after all, my opinion may be wrong!
Regarding 10 metres, why not
give access to the 'B's? After all, is it
not better that we all use it, rather
than lose it due to the present
inactivity?
D J Butcher G1UBO
And more . . .
Dear HRT, I feel I must comment on
the letter from M Allen (Oct 87 HRT)
concerning 'B' licensees having
access to 70 & 50MHz.
I have been licensed since 1981
and I am always on the lookout for
DX on 2m and 70cm, when I have
the gear. I live, and always have done,
in flats. Never having a garden never
having any room to put up any HF
antennas in order to warrant me
obtaining an 'A' licence, 1 was very
pleased to hear that 'B' licensees
were granted acess to 50MHz.
Having listened to 50MHz prior to
'B' licensee access, and hearing not a
lot, I can only say that activity by 'A'
and 'B' licensees will only do good for
the band (as was shown some years
ago on Two).
As for Ten, yes please, after all
quite a few countries allow their
equivalent 'B' licensees to use this
band, the activity it would create
would be very healthy (converted CB
rigs are not expensive) and a ten
metre dipole would fit my balcony.
Come on G4XMH, we don't all
have real estate.
C Stangroom G6CRX
And yet more!
Dear HRT, For 2 years we have waited
for the allocation of 50MHz to those
of us who do not have the desire to
take a morse test and work the HF
bands. Now this has been granted
(along with 70MHz), why do some of
those people who have got the
superior skill and intelligence to pass
the morse test start to moan about
the allocation.
We do not believe that there is
such a thing as Class A & B licences;
merely those who want to use HF
have to take the morse test as
required by Article 32 of the ITU. The
licence is after all, the same with this
exception. We have an HF receiver
Please mention HRT when replying to advertisements.
17
SET THE
THESE. KEYPADS ARE #
TAP
-TAPPITY
TAP lAf
\rAP
CjKEAj!'.....
frequency...
Volume \ MODE| BP 0 —
And
BlNCfO ffr
f
rv
| tone -
a
ft
TAP
(I
TAP
TAP
tf
-o
THE THIRD
STROfTE IT WILL.
BE THREE Te^
AHd forty
SECONDS
TAP
y /• )
Hi
here but after having listened to the
standard of operating on most HF
bands it stays firmly tuned to World
Service!
You have gathered from this letter
that we find the sentiments.of
G4XMH and others deplorable. Finally,
how many of these self-appointed
super operators use completely
homebrew equipment on 50 and
70MHz? Not many we suspect!
Julian & Hazel Tether G6LOH &
GIIMOD and the G7ABI Contest Group
Bandhogs revisited
Dear HRT, Re; J Moss's comments on
bandhogs (Aug 87). What Mr Moss
said was true, there is so much
satisfaction in making a rare DX QSO
using limited power and the joy of
knowing the contact was made under
the greatest of difficulty where
patience, politeness and common
sense paid dividends.
Radio operators of this calibre are
a rare commodity, it's so easy to work
rare DX with high gain beams, 3kW
linears etc. Mr Moss hold your head
high, it will be a great privilege to
hold a QSO with a common sense
operator.
S G Braid, Holyhead
Sorry Standard
Dear HRT, I wish to apologise most
sincerely to the company 'Communique', importers of Standard radio
equipment. Due to a misunderstanding between people, once
Communique became aware of my
problem they pulled out all the stops,
repaired the CBS and once again it is
back in my possession after nine
complete months. Any other name
mentioned in my original letter, the
thoughts still stand.
Thank you HRT for bringing this
long drawn out saga to a satisfactory
close.
H Fennah GW4FL2
18
IMo 'B's for Ten
Dear HRT, I was so pleased to read in
the September edition of 'HRT' the
letter from your correspondent, A L
Dick, GM6KKP, stating that he does
not oppose the use of morse nor the
testing of those who wish to use it.
I trust, however, that he will
understand, that I would most
strongly oppose the granting of
facilities at or below 30MHz to
holders of Class B licences.
G P Lovelock G3III
The Early Days
Dear HRT, This month's issue of 'The
Early Days' brought back fond
memories of my ham days 1937-39,
1946-48, when pressure of building
up my radio business and DXing till 3
am did not mix. My station G8AU
was first licenced at 226 St Helens
Road, Hastings, when in 1939 we
moved to 12 Springfield Road, St
Leonards, and the closedown for the
duration - my last QSO was with a
Polish station as Poland was being
invaded!
Horror of horrors, in 1942 Hitler
destroyed my receiver and gear not
impounded by the GPO (and my old
friend Fred Roberts the GPO Radio
Officer) and I lost all my precious QSL
cards etc from all over the world.
I worked G8AU on 14MHz and
28MHz mostly, whilst my great friend
Roy Southland G5RO was a 160 and
5 metre man. My TX was a crystal
oscillator 6H6 into a doublet 6L6 into
two 807s, grid voltage 2CjOV and
1000V on the anodes. A great time
was had by all!
How nice to see the TX so similar
to mine on p19 complete with 807s
and a 6L6. Zep or Windom antennas
were the order of the day and I
worked nearly all (not quite all)
continents and many countries on a
33' Windom.
I hope to get G8AU back on
28MHz soon with a 'modified'
148GTLDX, cannot at the moment
afford any other bands!
Donald Jackson G8AU
Going by the book
Dear HRT, Re: your letter of the
month in the Oct 87 issue, and
comments passed by M Allen G4XMH
on Class B licensees being allowed to
use 50MHz. What with the RSGB
being run down with letters relating
to same, what on earth is the matter
with the G4 licensees, are they
jealous or do not want progress.
Before the G4 gentlemen start
abusing the mere Class B licensees
they should get themselves some
education on how to operate on 2m,
a CO call was answered on S20 and
the G4 station replied 'take it up to
145.800 old man', the book states
145.200 and 145.800 are RAYNET
frequencies, wonder what the answer
to that question will be.
F Richards GW1LLIM
£10 FOR THE LETTER OF THE MONTH
You've got a gripe about the bandplans, or you're sick of being
wiped out by next doors microwave. Or maybe you've been bowled
over by the excellent service from your local radio shop.
Whatever you've got to say about amateur radio say it here in
the letters column and you could win yourself £10 for writing the
letter of the month.
S
d 0
Y *-"-epistles
to: Letters
Ltd, 1®'l
Golden
Square, London
W1RColumn,
3AB. Ham Radio Todav. ASP
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
]
HI
All of the components mount on the
non-track side of the PCB and are
inserted into the board as far as they
will go. Resistors lie flat against the
PCB surface and are all on 10mm
spacing between lead. Similarly,
capacitors are inserted through their
mounting holes as far as they will go
leaving minimal lead lengths above
the board.
The four transistors should be
inserted so that about 3mm of the
leads are above the PCB — don't put
them in so that all the excess lead
length is above the PCB. One, it looks
ugly and two, you will have stability
problems.
The only components to keep an
eye on are the polystyrene capacitors and electrolytics. The former
can be soldered in as with any other
component but don't touch the
actual plastic body with the iron —
it will melt and short out internally.
If this happens throw it away and get
another one. The electrolytics are
polarised (that is, they are fussy
about which way round a DC voltage
is applied to them). One end is marked with a ' + ' sign to indicate the
positive voltage end, or sometimes
the negative end is marked instead.
Whichever, make sure that when you
put it in, the positive end coincides
with the hole on the layout marked
with a ' + ' sign.
A similar condition exists with
the three diodes in that there is a
correct way round for each. A black
band shown on the layout corresponds with a black band on one end
of the diode. In the case of the two
Schottky diodes, these may have a
blue/grey band at the appropriate
end rather than black. Take care
when bending the leads as the glass
bodies are fragile.
25, 20 & 21 with polarities correct.
All these capacitors sit with the
Go directly to 80 metres,
bases of the cans against the PCB
upper surface.
with part two of this
8. Insert and solder the four
constructional project
polystyrene capacitors C1, 2, 3 & 4.
from Cirkit.
Don't melt the bodies! Ignore any red
marking at one of these particular
capacitors — it is not a polarity
marking.
Before starting construction,
9. Insert and solder D1, 2 & 3. Make
check that you have all the
sure that the banded ends are in the
components necessary and that the
right places and take care when
PCB doesn't have any whiskers or
bending the leads.
solder bridges left on it from
10. Insert and solder Q1, 2, 3 & 4.
manufacture. Remove any with a
Make sure that the flat side of the
sharp tool or scribe.
packages coincide with the flat side
1. Insert one of the 1mm diameter
on the layout. Push the packages
PCB connection pins into each of the
into the holes until about 3-4mm of
holes marked with solid black circle.
lead shows above the PCB before
These are used to solder the various
soldering.
connecting wires to later. The pins
11. Insert and solder LI and RV1.
are inserted from the under (track)
12. Insert and solder IC1, making
side of the board and pushed in until
sure that the pin 1 identifier is in the
the small head is against the PCB
correct position, or that the notch is
track. Use a blunt nosed tool to get
at the right end of the package.
them right home before soldering.
The only remaining operation is
There are 15 in total.
to wind the transformer. Follow
2. Insert and solder C8, 9, 10, 11 &
12. From now on, cut off all excess these directions and you won't
(hopefully) have any problems.
lead lengths under the board as you
1. Take a 35mm length of 0.2mm
go along.
diameter
enamelled copper wire and
3. Insert L2 and L3 into the PCB until
put one end through one of the holes
the bases are resting against the
in the ferrite block until about 15mm
upper surface, then solder all pins
protrudes from the other end. Take
and the two tags on the cans on the
the other end of the wire and thread
underside.
it back down the other hole. You
4. Insert and solder RFC1, then all
should now have a loop of wire
the fixed value resistors. Double
running up one hole and back down
check the resistor values as you go
the other, with both wires hanging
along.
out the same end of the ferrite block.
5. Insert and solder the following
This
is one turn. Now, using the
ceramic capacitors: C28, C7, C13,
C18, C16, C26, C19, C22, C6, C27 longer wire, continue threading
through the holes in the block in the
and C5.
6. Insert and solder C17 (220uF/16V same direction until you have 8 turns
through (8 in total). This completes
axial) — note the polarity.
7. Likewise, place C14, 15, 23, 24, the primary winding. Trim the
:e>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
19
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protruding wires to about 10mm.
wax nor the Araldite will affect the
2. Turn the block round so that you
circuit performance.
can start winding the secondary
This completes the assembly of
through the holes, but this time
the PCB. It may now be tested and
commencing from the other end.
aligned.
Wind on 8 turns, starting with a
Before switching the power on,
piece of wire 70cm long. Don't cut you can connect an antenna to the
off the excess length yet from the
receiver (pin B). As mentioned
winding just made. You should now
earlier, the best results will be
have a pair of wires protruding from
obtained with a well matched 50
each end of the ferrite block, with
ohm impedance, either a dipole,
the pair you have just wound
G5RV or a long wire type used with
comprising one half of the centre
a matching unit.
tapped primary. To make the centre
Having connected everything up,
tap, start to thread the longer lead
turn the volume control to minimum
still protruding from the transformer
(fully anticlockwise), set preset RV1
through the other hole as though you to mid travel, adjust the cores of the
were starting another turn until you
three transformers level with the top
have a loop about 10mm out from • of the cans and apply power. The
the core. Twist this loop together current consumption should be
neatly (this is the centre tap), then
somewhere under 60mA. If all is
carry on winding another 8 turns.
well, turn up the volume control and
Don't change direction with the
you should hear some hiss from the
winding during this process!
speaker showing that the audio
3. Trim all wires to about 10mm in
stages are working. Applying a
length, then strip off the insulation
finger to the base of Q3 should
on each of the five ends using a
induce a lot of hum. If you don't get
sharp knife to within about 3mm of
anything at all, check the connectthe core.
ions to RV2 first, then that the
4. Thread the wires through the
speaker is connected properly, if a
appropriate holes in the board (three finger or metal tool on pin 3 of IC1
at the secondary end) and then
brings up hum, then the fault must
solder in place making sure that the
lie between Q3 and the volume
core is resting against the PCB
control. The voltage checks shown
surface. It will help prevent microon the circuit may help to locate a
phony and the possibility of the core
fault.
wires fracturing if you drip candle
Once the audio stages are
wax all over this transformer
working, try tuning the capacitor
assembly to fix it in place on the RGB
around and with luck you should
(you can use Araldite, but do it when
hear a signal somewhere. Temporyou have checked the board out in
arily adjust the cores of L2 and L3
case you have to rewind the trans- for maximum strength. You now
former for any reason). Neither the
have to find the bottom of the 80M
20
(^n)
2SK55
Please mention HPT when replying to advertisements.
c''
amateur band. If you have a frequency counter, then all you need to
do is to attach it pin C and adjust the
core of LI so that the frequency is
3.490MHz with the capacitor vanes
fully meshed (fully anticlockwise).
Then peak L2/3 on a signal at
mid-band.
In the absence of a counter, set
the capacitor fully anticlockwise and
adjust LI slowly until you come
across amateur CW signals — these
will lie (most probably) between 3.5
and 3.6MHz. Using these as a guide
it should be possible to estimate
where the band starts. Alternatively,
you could of course use a signal
generator or crystal calibrator as a
marker generator to aid getting the
frequency correct. Once you have
the bottom of the band set correctly,
the top will take care of itself, the
bandspread being preset by the
values of C1 and C2. Again, L2/3
should be peaked on a signal at
mid-band.
The balance control RV1, will
probably be fairly accurately set if
left at mid travel. If you experience
direct breakthrough of broadcast
signals on 80M, adjusting the setting
of RV1 carefully should eliminate
them depending on how strong the
interfering signal is. This is most
likely to happen with an untuned
long wire type of antenna.
Finishing Touches
Once all is working, the receiver
can be built into a case, preferably of
metal rather than plastic. The tuning
capacitor will be a lot easier to set
accurately if a slow motion drive is
HAM RADIO TODAY DECEMBER 1987
The assembled board - note particularly the transformer winding.
attached to the spindle, either once
of the 6:1 epicyclic types or the dual
speed 30/6:1 versions, although the
latter is more difficult to obtain.
Some sort of 'L' shaped bracket will
be needed for this assembly.
For calibration, a dial on which
the frequencies can be marked is
needed and can easily be attached
to the slow motion drive.
Testing
Firstly, you will need to wire up
the volume control (RV2). Referring
to the drawing, screened audio cable
is used for three connections
between the control and the RGB,
with all the earth braids twisted and
commoned at the control end to
provide electrical screening of the
three wires carrying audio frequencies. At the control end, the twisted
braids are soldered to the tag shown.
Lead H has its braid soldered at the
RGB end to the adjacent earth pin,
while the braids of leads F and G are
twisted and soldered to pin D. Use
three lengths of screened wire about
12cm long for the connections,
stripping off 10mm of the insulation
at each end before twisting the earth
screen into a pigtail. Then strip off
5mm of the insulation on the inner
core of the cable.
Don't forget to link two of the
tags shown on the control together
with a short piece of wire. If wired
as shown, the control operates in the
conventional manner with clockwise
rotation increasing the volume.
Having connected up R\/2, use
another length of screened wire to
HAM RADIO TODAY DECEMBER 1987
connect up a four or eight ohm
speaker to tags E and D (braid to D).
The variable capacitor should be
connected up next. The two tags at
the front (spindle end) should be
linked together with a short piece of
wire to gang the two rotor halves of
the capacitor together. Then, using
a stiff piece of wire, connect these
linked tags to pin J. The longer stator
tag on the same side but at the back
connects to pin K (they can be
reversed without affecting anything).
Next you will require a power
supply for the receiver. This should
be capable of supplying between 12
and 14V DC at currents up to a
couple of hundred milliamps (on
audio peaks). It is important that the
DC supply is well smoothed and
does not contain any large superimposed AC component. If this
precaution is not observed, you will
end up with a lot of hum which will
be impossible to eradicate, amplified
up by the high gain audio stages.
Note also that pin D must be used
for connection of the negative side
of the supply, the positive connection going to pin A. As an
alternative to a mains derived power
supply, a car battery can be used if
available.
When first switching power to a
new circuit, it is a wise precaution to
use some means of current limiting
in case of any shorts on the board
which haven't yet been spotted. If
the PSU you use has this feature,
then set it to 100mA before
switching on. in any case, use a
multimeter on a suitable current
range in series with the positive
supply so that you can observe the
current taken by the circuit on switch
on. If it is far too high, switch off at
once and investigate before
proceeding any further.
Alternatively, a digital frequency
counter module (type PCIM 177) is
obtainable which will give a direct
readout to 100Hz of the operating
frequency, although its use does add
a lot to the cost (you would be able
to use it in other projects later
though). If this is used, then connect
together the pads on it marked S3,
S4, AM/FM and VDD using short
lengths of insulated wire. Connect
VDD to the +5V supply pin (M) on
the receiver PCB using a length of
insulated wire. Then, using a short
length of miniature coaxial cable, use
the centre conductor for the connection between the counter output
on the receiver PCB (pin C) and the
module input (INPUT), and the braid
for the earth connection from VSS
on the module to the earth pin
adjacent to pin C.
This receiver should provide you
with many hours of enjoyment on
the 80M band. Happy listening!
A complete kit of parts for this
project (excluding case and speaker)
is available from Cirkit Holdings, Park
Lane, Broxbourne, Herts, EN 10 7NQ
for £15.90 inc VAT. Stock No
41-03414. The optional multi-pole
audio filter is also available from the
same addresss for £18.25 inc VAT;
Stock No 41-02900.
Please mention HRT when replying to advertisements.
21
TOD/W
HF Convention '87
Both the venue and the weather were just the same as last
year on 27th September for the '87 HF convention, so as
a result a good time was had by all at the Belfry Hotel
just south of Oxford. The £3 entry fee gave access to the
usual lecture series which ran throughout the day,
covering topics as varied as 'Special Forces Signals',
'Measurements in the shack' and Dxpedition slide shows
from the Peter the 1st Island and Market Reef excursions.
One item which was noticeable for its absence on the
programme this year was the open forum or questions and
answers sessions which provided for an entertaining and
lively debate in 1986. One visitor commented that perhaps
it had got too lively last year — hence its demise, but
hopefully this is not the case as this would surely add fuel
to the fire of those who criticise the RSGB for lack of
accountability.
In other parts of the hotel the RSGB bookstand
seemed to be doing a respectable trade — both in John
Devolderes new book on LF DXing and especially in copies
of last years 1987 American Radio Relay League Handbook, an excellent tome of over two inches thick covering
virtually everything an amateur would want to know, and
then some!
The Belfry Hotel, Oxford. Venue for the RSGB HF
Convention
Special event stations GB2CAR and GB2HF in full swing
A number of the RSGB committees were represented,
including the EMC stands which featured amongst its
exhibits a reprint of one of HRTs articles on radio interference suppression techniques. The propagation studies
group and planning panel also put in an appearance whilst
for those who were very much into the CW end of the
HF operation there were two opportunities to prove their
signal-winkling abilities, with a taped 'CW pile-up' in one
room and the Dr DX computer simulation of CW contest
working in another.
Talk-in was on S22 as usual and everybody had a
fairly easy time of it — even the Deputy Editor didn't get
lost for once, although it must be said that you can see
the venue from junction 5 of the M40, nevertheless it was
nice to check that we did have the right motorway! HF
special event stations GB2CAR and GB2HF were sharing
the ops room with the talk-in station and were making
good use of a quite respectable selection of aerials
including beams and wire set-ups; in the photo you can
see Chris Norton GOAZV operating 'CAR and on his right
Dale Kipping GOACL trying to get a bit of action on
14MHz.
All in all a pleasant and informative day at an easily
accessible site offering plenty of room and refreshment
facilities without becoming embroiled in the usual scrum.
But don't forget to buy your lunch tickets before 12 otherwise you'll have to raid a burger bar on the way home!
District Radio Amateurs has
New Club
now been established, to be
for Sudbury
known as SAnDRA.
Radio amateurs and SWLs livA short note from club
ing in the Sudbury area will be secretary Colin Muddimer
pleased to hear that a new G1GPD tells us that SAnDRA
radio club — the Sudbury and is alive and well with the first
three meetings being well attended. Colin also mentions
that all are welcome at the
regular meetings which are
held at 8 pm on the first Tuesday of every month at The
Saracens Head, Newton
Green, Sudbury. Good luck
with the club SAnDRA. We
think we may have an idea why
the turn out is so good! Colin
can also be contacted by phone
on Sudbury (0787) 77004.
ALC controlled power input
level which allows the transverter to still develop full
power with input levels varying from 1 to 5 Watts of drive,
or optionally over a 5 to 10W
range. The unit also features
SWR and reverse polarity protection circuits and transmitter
spurious outputs of better than
85dB for 2nd harmonic and
local oscillator levels — better
than 60dB for all other
spurious products.
Covering from 50 to
52MHz with a frequency
translation accuracy of better
than 1kHz the unit is multimode and offers both PTT and
RF sensing VOX for transmitter control. The HC266 is supplied in a dark grey case with
white screen printed control
labelling, an operator's handbook which includes block and
schematic diagrams and costs
£179.90 inc VAT.
Further details on the
HC266 can be obtained from:
C M Howes Communications,
Eydon, Daventry, Northants,
NN11 6PT or Tel: (0327) 60178.
New 2m to 6m
Transverter from
Howes
Howes Communications has
just announced the addition of
a new 2 to 6 metre transverter
to their product range.
The new Howes HC266 is
a ready built unit which features a 10W RF output and an
22
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
Rathlin Island
Line-up
The Ballymena Radio Club set
out once again on their annual
pilgrimage this August to commemorate the work done by
Marconi for Lloyds of London
89 years ago. Special event
stations GB3MKB, located on
Rathlin Island activated square
1065VH, WAB square D15
and WAB squares D14 and
DOS were also worked using
the club call of GI3FFF/P.
Operation was on both HF and
The Ballymena Mob! Back row from left: Jonathan "IXIB, Bill '1YDX, Bert '3RIMY, Graham
BRS7781, Hugh "1RBN, Owen "1XND, Aubrey '4T0R, Albert '4CRL, Billy '4KUM, Graham
'4SFZ and Isaac '4P0V. Front row; David "1KLH, Stan '4VJC, Tommy '4VJZ and Bertie
'4DCC.
VHF with ATV activity on able to join in the fun through
70cm, although club secretary illness. Looking on the bright
Jeffrey Clarke GI4HCN wasn't side though, at least he avoided
being in the police line-up of
dubious characters shown
here!
feeder socket is to be replaced
with a plastic moulding to
secure the wire better and
provide water-proofing, and
the problem of the centreresonant frequency on 14MHz
being shifted by rain droplets
has been reduced by altering
the L=C ratio for the loading
coil, the 20m band being the
worst offender in this respect.
The letter goes on to say
that the possibility of a larger
version, to improve coverage
of 80m and possibly even
allow top-band working, is
being actively looked into.
Also, it is suggested that in
very exposed locations, the top
telescopic mast can be lowered
by a few inches to improve
physical stability without degrading performance. Incidentally, there have been good
reports of stations using this
antenna at roof height with
random radials.
Finally could readers note
that the new telephone number
for G-Whip Products is
0745-2004 (9am to 4.30pm);
their former number is now a
private line, so please don't use
it. G-Whip Products, 4 Bryn
Coed, St Asaph, Clwyd,
Wales.
PD SIG, the public domain software interest group,
in May this year started their
first 2m packet radio BBS
system on 144.650MHz. The
system is run from the home of
Rod Smith, the group's software librarian, in Crowborough, East Sussex. The
system provides the usual mailbox facilities and message for-
warding, however the emphasis is to be on providing
software for downloading.
The system consists of a
PC clone with 20Mbyte
Winchester, an MFJ 1270 TNC
and the RF side consists of an
FT280 into a vertical colinear
12m above ground. The site is
700ft ASL and coverage seems
very good, direct contacts as
far north as Watford and South
into France have been logged.
Currently the system is oper-
ating under Rod's call sign
G4DQY, but a GB call is being
applied for. PD SIG counts
itself as one of the major
sources of public domain type
software for CP/M and
MSDOS, and its library of
over 2000 disks is probably the
largest in Europe.
The growing use of computers in the radio hobby and
the need for cheap specialised
software for these applications
is making PD SIG very
popular with the ham radio
community. (Copies of library
disks are available to members
for around £2.00. PD SIG also
has a number of telephone
BBS systems where software
can be downloaded if you have
a suitable modem.
For further information
send a stamped, self-addressed
envelope to; Rod Smith,
G4DQY, Winscombe House,
Beacon Road, Crowborough,
East Sussex TN6 1UL.
Come On Down
— to Brixham
Data communications has become incredibly popular over
the past few years, yet surprisingly there haven't been many
events which reflect this trend.
Well they don't hang about in
South Devon Last year saw
the first specialised computer
and radio show which we've
heard of at HRT — and it was
such a success that 'Computercations 87' is now upon us
So if you are into radio or
computing or even a combin-
ation of both then this show
must certainly be worth a look.
Opening from 10 am to 6 pm
on Sunday, 1st November at
the Bnxham Community College, Higher Ranscombe
Road, Brixham. Admission is
only 50p for adults and 25p for
children, senior citizens and
UB40s. There are refreshments available on site and the
show features professional,
business and home computer
hardware and software. Ham
and CB radio gear, video
equipment and a bring & buy
sale.
There will be talk-in facilities on S22 and a special
event station GB4CPU will be
on air throughout the show.
During the day there will also
be demonstrations of satellite
communications using weather
sat and UOSAT systems, with
a variety of ham demos including packet radio, Amtor,
RTTY, ATV and satellite TV.
For further information
contact; Ian Chipperfield, 9
Sun Valley Close, Brixham.
Tel; (08045) 59224 or Jeffcry
Birks, 46 Eden Park, Brixham.
Tel: (08045) 7014.
■ ^ST1 Putercations '87 I
It 0<v<*, Hmjo Clul.
? COfPUK/rs.
SUNDAY 1.| NOVfM,
BRIXHAH COM If ORfl TV
G-Whip Changes
We've heard from G-Whip
Products following our review
of the G-Whip multiband (HRT
June 1987) and they say that
they're acting on our few
criticisms of this antenna to
make it even better value for
money.
In particular, the aluminium bracket for the SO-239
Public Domain
Takes To The Air
HAM RADIO TODAY DECEMBER 1987
DCUOWSrnATFCSOl
We couldn't resist showing
the Computercations '87
poster, all produced on a
home micro
Please mention HRT when replying to advertisements.
23
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SCANNER
the lowest converter frequency of
115.15MH2. So what of the radio
itself?
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Getting acquainted
With so many more features
packed into what is essentially still
a scanner sized box you would
expect the new rig to appeal to any
shortwave enthusiast, however the
initial enthusiasm may wane and
even turn into angry frustration
when actually trying to learn how to
use this complicated and awkwardly
designed piece of gear.
There are several ways of tuning
in your stations, the first. Direct
Tuning, is easy to operate even
though it takes a sequence of seven
moves to input the frequency of your
desired station. When correctly
done, after pressing the EXECUTE
button, you will be rewarded with a
beep sound, but if you input a wrong
frequency you are 'honked' at and a
'Try Again' indication blinks at you.
In the early learning stages of
operating this radio a harmless and
mindless diversion can be to play
with the noises as a displacement
for your aggression! Although direct
tuning with its 'Direct + frequency
+ Execute' entry system is fairly
It looks like an Air-?, it works like an Air-7 — but it
SCAN + button moves the set up
frequency and SCAN - moves it
down. In fact the only difference
between the modes is that whilst
scan tuning relies on the autosquelch facility, manual tuning only
allows one frequency step at a time,
because the squelch has to be set to
minimum.
A further option is to set the
squelch control to a level determined
by the operator (squelch control
being in the manual 'up' position) so
that only stations above this signal
strength open the squelch. Essentially, manual tuning is for use when
you don't know the frequency of the
SONY
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does a whole lot more. K Berkeley Henderson
assesses the latest Sony handy receiver.
At first glance the new Sony PRO-80
is outwardly very similar to the Air-7
(reviewed in HRT Sept 87) but packs
in many new features including
almost continuous coverage from
150kHz through to 223MHz plus a
choice of modes including narrow
band FM, wide band FM, AM and
SSB. The standard set covers only up
to IO8MH2, with the extra coverage
being provided by an add-on
converter supplied with the set,
leaving a gap between 108MHz and
24
easy to remember it is the variety of
entry systems which can be baffling.
Having obtained the required
frequency, it is possible to make use
of another tuning system which is
Scan tuning. Here the squelch
control can either be set to 'automatic' by pressing the knob down;
whereby only stations above a preset signal strength will lift the
squelch or so called Manual tuning
can be chosen.
In either case pressing the
Please mention HRT when replying to advertisements.
1
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The 115 to 223MHz converter. Its two
internal AA cells add to the top-heavy
effect on the rig — good level of
internal screening though.
HAM RADIO TODAY DECEMBER 1987
Is
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Spot the difference! Externally, the Pro-80 (left) bears a remarkable resemblance
to the more basic Air-7.
station which you want to tune in,
or when you want more precise
tuning after scan tuning.
More on scan tuning
Scan tuning is a very useful
function but complicated in the
extreme since there are three scan
modes, all of which are simple
enough to set but confusing to remember as the scan mode indicators
tend to resemble a bad dose of
morse. The operation consists of five
steps, including the depression of
the SQUELCH button onto AUTO,
the selection of the scan mode and
the use of the SCAN +/— buttons.
When a station is received, the
RECEIVE indicator lights up and the
set then operates according to the
scan mode which you have selected.
Scan One mode stops scanning
when the first station is received and
allows it to be heard continuously.
Scan Two mode receives the station
for two seconds before scanning
resumes, and Scan Three mode
receives the station unt1' its signal
stops, then resumes scanning again.
Limited Scan Tuning allows you
to define an upper and lower limit in
frequencies for scanning and involves a miriad of finger manoeuvres
and a bountiful abundance of 'beeps'
to confirm each stage of the operation. After selecting the scan mode
you then keep FUNCTION pressed
and press button 1, 2 or 3, following
this you direct tune your lower limit
frequency, keep ENTER pressed and
press DIRECT. To tune in the upper
limit frequency, you use another
method, namely after tuning in the
frequency you again keep ENTER
pressed but then press the EXECUTE
button. You then use SCAN +/— in
the normal way to scan between the
chosen limits.
Priority Tuning is an interesting
addition to the receiver which enables you to check a station which
you have designated as a priority.
The receiver automatically tunes into
the station every three seconds to
check whether there is a signal or
not. If one is picked up, the priority
station overrides all others and is
tuned in continuously. Not only do
we have our auditory confirmation
but'in addition to the word 'priority'
appearing on the display, we also
have a 'blinking' number on the
memory section.
Thanks for the memories
If you thought that the tuning
options stopped there you'd be
wrong! Like the AIR-7 the PRO-80
offers a forty station memory, having
the ability to store ten stations on
each of four separate 'pages', page
selection being made by means of a
rotary switch on top of the set. You
can tune in a station by any mode
and simply by pressing the ENTER
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The Pro-80 top panel controls.
]>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
25
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W./N. FINE SS8
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Detail of the liquid crystal display.
button and one of the number
buttons simultaneously, you have
stored your station, again a 'beep'
sounds and the LCD confirms which
memory page and on which button
it is stored. Memory search is
another operation which enables you
to check the stations on one memory page whilst you are still listening
to a station. The information on the
stored stations is displayed in
sequence.
Memory Protection is another
handy function which prevents the
accidental erasure of the memory
pages. Keeping the ENTER button
pressed, you also press MEMORY
PROTECT and in addition to the now
familiar 'beep' sound, a small key
appears on the LCD as a further
indication that your memory is
protected. Memory scan tuning is a
fairly easy operation, although the
LCD looks like a numbers game as
the frequencies flash past!
Get converted
Perhaps the clumsiest part in the
design of the PR080 is the converter
which allows reception of air band,
public service band, and TV VHP
channels by shifting the frequency
coverage of the receiver by 115MHz.
After inserting 2 AA batteries into
the converter itself, making it a bit
top heavy for the receiver of course,
you then attach the telescopic antenna to the converter and the converter to the antenna connector.
Then comes the most awkward and
quite unbelievable part of the
operation — the removal of the
26
battery case from the battery
compartment in order to set the
frequency display switch underneath
the battery to SHIFT.
Having done this you then
replace the battery case and have to
go through four separate stages to
program the set for a 115MHz offset
on the display. This does give the
advantage of having the correct frequency shown on the LCD — but if
you're the sort of operator who likes
to jump from VHP to HE and back
again the system is what computer
hacks would call 'user hostile'.
Tuning involves setting the
ATTENUATOR selector on the converter to OdB and then setting the
FILTER selector (also on the converter) according to the frequency of
the station which you want. Tuning
can then be done in any of the ways
already detailed, and should there be
interference from an adjacent station, you can set the attenuator to
— 30dB to improve reception.
Feeling Fine
To select the detection mode is
again a fairly simple task but one
would do well to make up a card of
the buttons to be pressed and the
relevant detection mode because
there are five to be memorized in all;
for example, to receive EM broadcasts you have to press FUNCTION
and button 4. Fine Tuning of an AM
station is the AM WIDE or AM NARROW detection mode is executed in
a similar way, with the FUNCTION
key being pressed then button 6.
'Fine' will appear on the LCD and a
'beep' will sound, enabling you to
use the FINE/SSB control on the top
panel for better reception. It should
be noted that the fine tuning range
is approximately +/- 3.5kHz.
In use
Regular readers of HRT's scan-
NOR
AL
FT
Buried away in the depths of the battery compartment are the MW channel
step (I) and reset (r) switches together with the display shift switch for use
with the converter.
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
ner reviews will realise that, unless
you take out a mortgage to buy a
professional radio, compromises
have to be made in terms of design
and performance. AM and FM broadcast performance was quite acceptable, although a tendency to overloading was noted on wide band FM
when close to the transmitter site.
Medium wave reception was acceptable whilst not being in the 'communications receiver' performance
bracket — and Long wave coverage
was broadly similar.
For most people however the
attraction of this set would be the
ability to listen to both shortwave
and public service transmissions all
in the one box, so I will deal first with
the HF coverage. SSB facilities are
becoming increasingly necessary for
even the most casual SWL, more
international broadcasters are following the lead of stations such as
Radio Sweden with SSB outlets and
in this respect the set coped quite
well in its sideband mode. On the
amateur bands, where stations operate a good deal closer together, the
selectivity left something to be desired when compared to a purpose
built communications receiver but
for general shortwave reception and
occasional forays into ham bands
performance was adequate.
It was also noticed that when
tuned to one of the international
frequency standards in SSB mode,
there was a tendency to drift — but
as there was no S meter fitted to the
radio it wasn't clear whether this
was due to local oscillator pulling or
just simple thermal wanderings. As
far as short wave is concerned the
radio is much more suited to the
casual listener rather than the ardent
DX chaser.
Public service coverage, apart
from the ludicrous antics needed to
get the frequency offset right, was
quite acceptable. Sensitivity was on
a par with a run of the mill handheld
on 2 metres, although again there
was a tendency toward overloading
which could be reduced by means of
the attenuator on the converter.
There seemed to be few problems
with breakthrough from other bands,
mainly due to the well screened inner
case which housed the converter;
although the whole unit was awkward and unstable due to the top
heavy effect of the whip, converter
and its batteries. Overall the public
service performance was acceptable
HAM RADIO TODAY DECEMBER 1987
iifri
Inside the Pro-80, neat design and miniature components help pack more
features into the box.
without being exceptional for a hand
held scanner.
There is plenty of versatility in
terms of power sources for the main
set, with the options of four AA batteries, a rechargeable battery pack,
mains unit or a car battery. A disadvantage is the erasure of all memory if the battery pack is out for more
than three minutes, which immediately becomes a problem for physically disabled shortwave listeners
such as those with arthritic
complaints.
The antenna provided with the
receiver is a telescopic aerial with a
TNC screw connector but an adaptor
is also supplied for connecting a BNC
connector. This antenna provides for
reception of SW,VHF/FM reception,
ie. 1,605-108MHz. For LW and MW
reception (150-1,602kHz), there is a
built-in ferrite bar, therefore you
rotate the receiver for optimum re-
ception. Another good feature is the
KEY PROTECTION which is to avoid
the accidental operation of the
buttons — you've guessed it, the
radio beeps at you when it becomes
protected and another little key
appears, this time on the bottom left
of your display.
To complete the package you are
given a carry case which completely
protects your receiver and even enables you to use the buttons when
covered, a nicely designed earplug
and a hefty tome of operating instructions which varies from being
clear and lucid to unimaginably complicated. The radio looks quite good,
sounds quite good, and at £329 inc
VAT is quite good value for money —
but it may take you some time to get
to grips with it!
My thanks go to Sony UK Ltd
who supplied the review unit.
Please mention HRT when replying to advertisements.
27
niz^SroO^d]
Short Wave
P(c^
Converter
sensitivity of most two metre
receivers (or transceivers) will be
more than adequate to cope with HF
operation.
If you're already kitted up for two metres, moving
to HF can work out pricey. One answer is to go for
a VHF receive converter before taking the plunge.
Ken Michaelson, G3RDG, looks at the Datong PC-1
short-wave converter.
The Datong PC-1 isn't a clone
computer, but a converter unit. It
allows you to use a VHF receiver (or
the receive section of a VHF
transceiver) to cover from below
SOkHz to 30MHz in thirty bands of
1MHz each. So, using the 5MHz
setting, for instance, an incoming
signal at 5.455MHz could pop up at
144.455MHz on the VHF rig.
No modifications are required to
the receiver used, so the PC-1
represents a cheap way for a class
'B' licensee to sample the delights of
HF. It also represents a way of
getting the facilities one has come
to expect of synthesized VHF rigs
without the 2nd mortgage type HF
prices.
How It Works
The frequency range is selected
by two rotary switches, the first
deciding the tens of MHz, the other
units of MHz. Besides the on/off
switch, there are two other controls
on the front panel: the HF/VLF
selector, which is used on the 0 MHz
28
band to select a special filter for
below 550kHz or a HF filter for
above 500kHz (the PC-1 obviously
doesn't 'know' what frequency the
receiver is tuned to); and a hi/lo gain
switch, which is in fact an attenuation control.
The internals of the PC-1 are very
straightforward. The input goes first
to a filter block; there are seven
band-pass filters in this block, the
signal route being decided by the
reception band selected, after which
the signal is then passed on to a
mixer stage. The other input to the
mixer is from the local oscillator,
which uses LSI techniques to derive
all thirty of the required frequencies
from a single crystal-controlled
source; the frequency of which is
selected according to the desired
reception band. Finally the output
from the mixer, which is now at VHF,
is passed through a 144-145MHz
band-pass filter.
All this filtering has the effect of
reducing the signal level by 3dB
(manufacturer's figure), but the
Please mention HRT when replying to advertisements.
In Use
The PC-1 gave a good account of
itself, and particularly impressive
was the lack of any perceptible increase in noise level between using
an Icom R71E receiver on its own
and with the converter. So far as the
PC-1 is concerned, the manufacturer
states that an input voltage of less
than 0.4uV will give 10dB S + N/N at
29MHz and that the sensitivity is
substantially constant from 50kHz
to 30MHz. Not having the test gear
to check absolutely the veracity of
this claim, I can only say that as a
user these figures are apparently
accurate.
To show the sensitivity and
stability of the PC-1 (and, incidentally, also of the DC144/28) part of a
German news bulletin is shown here.
This was transmitted on 140.3kHz in
ASCII at a speed of 200 baud. My
apologies to German readers for the
Gothic letters!
For all the signals I received, I
used my normal 80 metre dipole —
even for VLF. Formerly, I have had to
use a frame antenna to get any
decent signals on VLF, so I was very
impressed by the efficiency of the
PC-1.
The same capabiity of producing
signals without any discernable
background noise was displayed
throughout the 30MHz tuning range.
Only two significant spurious signals
were found, one at 10.24MHz which
failed to move the S-meter and the
other at 20.48MHz, which gave an
S5 reading. All other spurii were at
the threshold of audibility.
Some Details
The PC-1 is built in a smart silver
anodised aluminium case, with black
front and rear panels, measuring
184mm(W) x 153mm(D) x 54mm(H)
(7.2 x 6 x 2.1 inches). The knobs and
HAM RADIO TODAY DECEMBER 1987
■p
a
~
'w'
The DC144/28 VHF converter
switches add 17mm (0.7 inches) to
the depth and the unit weighs 1kg.
Power requirements are 10 to 13
volts at 140mA, but the manufactu-
rer says the PC-1 will withstand up
to 20 volts for short periods. For
sustained operation at above 13
volts, a dropper resistor should be
ON r
bsil82 4 kna'IBB vvvvb kna 417
pi/B/Paps-ti Gerechte AwbI Cndergesetze
023/Vat
Papst •fordert gerechte Ausl tndergesetrgebung
BelJrden dSr-fen0Einwandurer nicht -fiskriminieren
Vati kanstadt •, 3. September' <KNA> Papst Oohannas Paul 13. hat af die
Regierungen in aller Wglt appelliert, jede Diskriminierung der
auslCndischen Arbeitnehmer zu vermeiden. In einer am Donnerstag,3.
September, % im Vqtikan ver!^fent1ichten Botschqft sum Welttag der
Emigranten fordert der Pqpst die Behtrden auf, in ihrer Gesetzgebung
die Rechte0der Einwanderer zu berJcksichtigun. Die katholischef
Laien'm>55en nach dem Will en des Papstes'den Behirden ihser LCnder
gdrechte L1 sungen bez>glich Wohnungen, Areitspl <tren'und sozialerGSichdrheit +>r
die Auswanderer vorschlagen.li
Johannes Paul II. betont in seiner Botscha-ft, da~ die Kirche^keine
Gelegenhei t ungenJtzt lasse, um an das0moralische Gewissan der
Behtrden zu appellierenl das Los der Auswanderer zu*er1eichtern. der
di esj <hri ge ■ Wei ttag der Emhwrantgn steht'unter -fern Thema* "Diu*
katholischen Lai en und0die Emigranten."01n seiner Botschaft warnt
der Papst die reichen 1Cnder davor, Desinteresse fir d's
Auswendurungsproblem zu zeigen, die Grenzen zu schlie^en Oder die
Geset^e zu verschCrfen. Dies'wlrde"unweiger1ich zw0einer weiteren M
Vertiefung des Abqrundes zwischenpden armen und seichen L-Cndern
f>hren. Au-fgabe der katholi schen Laien sei0es, in einer Situation
der Diaspora und'wachsanden Unglaubens* den oft entwurzelten
Ausl Cnderbami1ien bei des Bewahrung un' Weitergabe dus'Glaubens an M ,
ihre Kinder zu helfen.
kna fw
031702 sep 87
Printout of a German news bulletin service
HAM RADIO TODAY DECEMBER 1987
inserted in series with the supply rail,
and an appropriate formula is given
for this. The supply does not need to
be regulated or even particularly well
smoothed; the instructions suggest
that a suitable supply may be
obtained from the receiver's
accessory socket.
One thing 1 did not like was the
use of a 3.5mm 'earplug' type socket
for the power supply input. The
problem is that if the plug is pulled
out or inserted with the power on,
the power source will suffer a
momentary short circuit, which
could cause quite a lot of grief, not
to mention blown fuses, receiver
memory resets and so on. . .
My advice would be to use a
separate power supply which has
short-circuit protection.
The DC 144/28
This two metre converter was
loaned to me as an extra to use with
a 28MHz receiver; it is made on a
plated-through glass fibre PCB and
is contained in a standard diecast
box which measures 113 x 62 x
31mm. The input and output connectors are S0239 and the input for
the power plug is a 3.5mm socket.
It is fitted with input and output
attenuators to match into any
receiver, which is a very good point,
particularly for use with the PC-1. It
has a noise figure (as quoted by the
manufacturers) of better than 3dB
with both gain controls at maximum.
I would think that this is due to the
fact that the DC144/28 uses a very
low noise input MOSFET (A 3SK88)
and a JFET post mixer amplifier. The
input and output impedance is 50
ohms and the unit requres 10-14
volts DC at 100mA. It weighs
250gms.
Conclusion
I was very impressed with both
these modules, and can only say that
for those of you who want to receive
signals transmitted on the HP bands
and baulk at the cost of a good and
therefore expensive receiver, the
PC-1 and the DC144/28 if needed,
could be the solution.
The price of the DC144/28 2
metre converter is £39.67 and that
of the PC-1 £137.42, both prices
being inclusive of VAT and delivery.
Thanks are due to Datong
Electronics Ltd of Leeds, for the loan
of the review units.
Please mention HRT when replying to advertisements.
29
A
□J/A
I
)
A
REVIEW
Dual band mobile sets are readily
available in a compact size, but this
is not always the case with portables. There are three manufacturers
of 2m/70cm dual band portables at
the present time, the latest product
to hit the market being the C500
from Standard. Only two C500s
Z]
avoided and sanctuary can be
sought in. the wide open spaces of
70cm if 2m gets too much for you!
So, what of the rig itself?
Features
Rigs are getting smaller all the
time, but when I opened the C500's
Standard enters the two-band portable market with
the C-500. Capable of cross-band full duplex, Chris
Lorek, G4HCL, tries out the latest pocket
simulcaster.
were in the country at the time of
writing, but the HRT heavy mob,
sorry, review team managed to extract a review sample to test for our
readers. When this appears in print
at the Leicester Exhibition, dealers
stocks should be plentiful, and no
doubt many happy amateurs will be
returning home with a new toy to
play with!
Dual Band Advantages
With the growing number of
70cm repeaters in the UK at the
moment, designated 'community'
boxes covering a small, localized
area, many amaterus are getting on
this band as well as 2m. This is often
to escape the 'ratrace' on 2m in
many areas, where 'new pastures'
allow an unhurried QSO with local
amateurs whilst commuting, walking the dog, or waiting in a DX pile
up!
Rather than carry both 2m and
70cm sets around, a choice has to
be made between them and the
generally lower level of activity on
70cm often leads to 2m being
chosen. With a dual-bander such
heart rending decisions can be
30
Please mention HRT when replying to advertisements.
packing box I was pleasantly surprised with it's smart presentation as
well as it's small size and weight.
The set is smaller than many singleband sets, measuring 182mm(H) x
58mm(W) x 39mm(D) including the
battery case and knobs but excluding the PTT bar, this increasing the
width to 68mm. Coverage is from
144 to 146MHz, and 430MHz to
440MHz, with selectable tuning
steps of 5kHz, 10kHz, 12.5kHz,
25kHz, and 50kHz. The review
sample was supplied with a battery
case to fit six AA size cells, giving
1.5W transmitter output power
when fitted with nicads and slightly
more if dry cells are used due to their
higher voltage. Optional nicad packs
are also available, giving either 2.5W
or 5W transmit output power dependant upon type.
Dual VFOs
Two digital VFOs are fitted, with
frequencies controlled either by
direct key entry or by stepping using
the top mounted rotary tuning knob.
On the top panel also are rotary
controls for on/off/volume and
squelch, two push buttons control-
HAM RADIO TODAY DECEMBER 1987
ling high/low TX output power and
a switchable receive attenuator, jack
sockets for external speaker'mic, and
a BNC socket to allow connection of
an external aerial as well as securing
the supplied dual band portable
whip. The majority of the set's other
functons are controlled by the front
panel buttons, in conjunction with a
'Function' bar mounted above the
PIT key. The rotary squelch control
is complemented by a 'Sql Off bar
on the PTT extension, this raising the
squelch momentarily when pressed.
Each VFO range may store a
different repeater offset as well as
up to ten memory channels and a
user-programmed 'Call' channel. In
turn, each memory channel may
store frequency, + or - repeater TX
offset, and sub-audible tone squelch
frequency if optionally fitted. Each
VFO range may be programmed for
a given offset and direction, variable
from zero to the limit of the set's
band coverage, once selected by the
'RPT' button, toggling between +
and - is also possible without reprogramming. Momentary repeater
inpupt frequency checking is
possible by using the 'Rev' button.
Although not fitted to the early
review sample, I'm informed that a
1750Flz toneburst will normally be
enabled by a press of the PTT
followed by the 'Function' bar for
repeater access. Cross-band full
duplex, that is simultaneous transmit
and receive operaton, is possible
between VFO A and VFO B, by enabling 'the 'Dup' function, further
presses of the 'A.B.' button followed
by a number key, further single-key
presses then selecting the numbered
memory channel for the selected
range. The main tuning knob may
also be used for memory channel
selection, this stepping through all
20 channels.
Scanning
Scanning of either 'A' or 'B'
range memory channels for activity
is initiated by a press of the 'M.S.'
button, the scan halting for about 5
seconds on a busy channel before resuming. Likewise the VFOs may also
be scanned in the programmed frequency steps, a press of the 'SC.'
button giving a 1MHz scan coverage,
alternatively pre-programmed bandscan limits may be entered if required. A dual watch ('priority
channel') facility is also available, this
T ■
The C500, showing the battery pack (right) holding six AA cells and the
combined 2m/70cm aerial in the foreground.
briefly samples a given frequency
every few seconds whilst monitoring
or scanning away on other frequencies, the set locking onto the 'Priority' channel while it contains activity.
A battery economizer ('Save')
facility may be enabled in receive
mode, this switches the receiver on
for a fraction of a second every half
second or so until the squelch raises.
This may also be used in scanning
mode, the scan rate slowing down
due to the sampling rate. The frequency keys may be locked if required to prevent accidental frequency shift in use, likewise the TX
PTT may also be disabled of required. The usual 'bleep' sounds on
each key depression, a longer, lower
frequency bleep indicating an
incorrect entry, these may also be
disabled if required.
An LCD panel shows the operational frequency in large digits,
together with indications of the
other selected functions such as
memory mode, VFO A/B, offset, PTT
lock and so on. Along the bottom, a
bargraph indicator shows relative
receive signal strength and transmit
power output, and a small 'B' indicator displays to warn if your batteries are about to breathe their last.
The display may be backlighted by a
press of the 'Lamp' button mounted
on the PTT bar.
In Use
I found the set very easy to hold,
fitting very nicely into the palm of my
hand, which is very important when
you consider that at £420 a time it
would be a rather unwise move to
drop it! The supplied wrist strap
gives an added measure of security,
but the set was light enough to fit
into my inside jacket pocket most of
the time without becoming an incumberance.
It took me a short while to get
used to operating the set's many
functions, however once learned 1
Top panel controls
—lt>
HAM 3ADtO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
31
found it very easy to control. The
function bar mounted on the PTT
extension, always within reach
without letting go of the set, was to
be found far more useful than the
usual keypad button, however in
normal use this was not usually
needed. I found that I invariably used
the set in memory mode while portable, using the tuning knob rather
than the one-touch keys to select
channels. This allowed me to quickly
check all the programmed memories
rather than just either batch of 10
each time, as was the case in
memory recall or scan modes. 1
found that, although the memories
would store offset and direction, it
was not possible to mix 600kHz and
1.6MHz offsets in the same memory
range apart from Channel 1 in each
case. I didn't find this too much of a
problem, as I stored the area 2m repeater in Channel 1 and other local
simplex and 70cm repeater channels
in the remaining 9 channels. Alternatively, one could always use Range
A for 2m and Range B for 70cm, but
this may limit some user's requirements.
Signal Handling
Received audio reports were
very good as long as I stayed around
8cm away from the microphone, but
surprisingly the mic picked up little
background noise. On receive, I
found the available audio just about
sufficient when walking around very
noisy environments, turning the
volume control to absolute maximum introduced rather a large
amount of distortion. I took the set
to a local rally to see how it would
perform with all the other 2m and
70cm signals in close proximity, including of course the adjacent talkin station. The simple answer was,
very well indeed, ! experienced no
desensitisation problems at all. Comparing this to one or two other portables in a similar 'real' test, the C500
stood up extremely well. I must say
that on walking around the rally
carrying the set I felt rather conspicuous, as several eyebrows were
raised with resultant enquires as to
who was selling them!
The supplied whip aerial is not
the usual helical, but instead functions as a quarter wave on 70cm and
a shortened, base loaded whip on
2m. In portable tests using distant
signals, I found tha aerial to be quite
efficient, more so than I would have
32
n
345 u
Detail of the keypad and display area
expected on 2m due to its reduced
length. Replacing it with a standard
Japanese 2m helical whip showed
little difference in my radiated signal.
I found the battery life very good, I
could use the set in continuous
QSOs using low TX power for several hours, and full day's use could
easily be obtained using the set
mainly in receive mode with the
occasional chat on high power.
Insldes
The set is constructed using a
die-cast alloy chassis with a plastic
front panel, this giving good mechanical strength as well as a heat
dissipation area for the transmitter
power amplifier. The controls and
keypad appear to be sealed against
dust and water, a rubber cover also
sealing the external speaker and mic
connectors, showing that the set
should survive being used during the
odd downpour, internally, three
printed circuit boards are used, with
wired interconnections between
them. Virtually all components are
surface mounted 'chips', so the
service engineers will be reaching for
their magnifying glasses again.
Separate PIN diode attenuators,
front ends, mixers, and synthesiser
-tuned voltage controlled oscillators
are used on receive for each band,
the resultant first IF signals at
55.05MHz being switched into a
common IF crystal filter and amplifier
stages. Downconversion to 455kHz
and subsequent processing takes
place in the usual TK10420 1C, and
a BA546 audio power amp IC drives
the internal speaker.
Please mention HRT when replying to advertisements.
On transmit, the separate final
TX frequency voltage controlled oscillator is directly modulated with
processed microphone audio, the
signal being amplified and then
passed to a block PA module on each
band. Separate MB87006 synthesisers are used for each band, rather
than a single IC, hence allowing for
the full duplex facility. A uPD7514
micro controls the operating functions of the set, it is interesting to
note that diode links are used with
this to control the frequency coverage of the set, allowing 130-170MHz
to be covered for the more nosey
amongst us!
Laboratory Tests
The receiver sensitivity was very
good on 2m and fairly reasonable on
70cm — the less sensitive 70cm
side being offset by the excellent
strong signal handling performance
measured on this band, yet this was
still good on 2m, confirming the onair test results. Of special note is the
low current drain on receive, this
being further improved by the economizer operation.
On transmit the frequency accuracy was excellent for a portable, the
harmonic purity likewise, however I
did notice a band of low-level spurii,
at 2.1fMHz spacings, around the 2m
signal. The transmit deviation was
unfortunately over the top on both
bands, this shouldn't cause too many
problems but I would be tempted to
delve inside the set to reduce the 2m
deviation at least.
Conclusions
The set is very small considering
its capabilities, its technical performance very good. Its many feature
such as dual band scanning, coupled
with full cross band duplex operation
when required, lends the set to a
variety of uses apart from just being
used as a walk around portable or as
a second set. I enjoyed using it very
much indeed, the ability to be 'in' on
the activity on both bands is certainly a very useful feature, especially so when you consider the set is
around the same size and weight as
many single-band sets. Pity it's not
the same price, but you can't have
everything! I was sorry to see it go.
My thanks go to A.R.E. Communications Ltd. for the loan of the
review set.
HAM RADIO TODAY DECEMBER 198?
Adjacent Channel Selectivity: Measured as
increase in level of interfering signal,
modulated with 400Hz at 30% system
deviation, above 12dB SINAD ref. level to
cause 6dB degradation of 12dB SINAD onchannel signal.
435MHz
145MHz
Spacing
22.5dB
+ 12.5kHz 32.0dB
32.5
-12.5kHz 28.5
58.5
+25kHz 65.0
60.0
-25kHz 65.0
LABORATORY RESULTS - STANDARD C500
RECEIVER
Sensitivity: RF input level giving 12dB SINAD
145MHz
Attenuator
0.149uV pd
Out
1.40uV pd
In
Squelch Sensitivity
Setting
Threshold
Maximum
145MHz
0.070uV
(3.0dB SINAD)
0.359uV pd
(31dB SINAD)
Receive Current Consumption (mA)
145MHz
Conditions
9
No signal, 'save' on
27.5
No signal, 'save' off
64
RX, mid volume
120
RX. max volume
435MHz
0.261uV pd
3.66uV pd
435MHz
0.064uV pd
(1.5dB SINAD)
0.385uV pd
{19dB SINAD)
Maximum Audio Output: Measured at 1kHz
on the onset of clipping, into an 8 ohm load
435MHz
145MHz
Blocking: Increase over 12dB SINAD level of
signal 1MHz away to cause 6dB degradation
in 12dB SINAD on-channef signal
435MHz
145MHz
Spacing
95.0dB
92.0dB
+ 1MHz
95.0dB
93.0dB
- 1MHz
Image Rejection; Increase in level of signal
110.1MHz removed to give identical 12dB
SINAD signals.
435MHz
145MHz
60.1 dB
89.9dB
TRANSMITTER
435MHz
10
32.5
71
130
TX Power and Current Consumption
145MHz
Power
280mW/155mA
Low
1.55W/630mA
High
Intermodulation Rejection; Increase in level over 12dB SINAD level of two interfering signals
giving identical 12dB SINAD on-channel 3rd order intermodulation product.
435MHz
145MHz
Spacing
69.5dB
62.5dB
25/50kHz
68.5
61.5
SO/IOOkHz
......
—■
Strength Meter Indication
435MHz
145MHz
Reading
1.07uVpd
- 16.8dB
I.OSuVpd
—
16.7dB
SI
2.76
-8.6
2.60
-9.1
S3
4.18
-5.0
4.12
-5.1
S5
5.77
-2.2
5.68
-2.3
S7
OdB ref
7.41
OdB ref 7.41
S9
8.83
+1.5
8.80
+15
S9 +
Peak Deviation
Frequency Accuracy
145MHz
5.38kHz
- 90Hz
Harmonics/Spurii
145MHz
Harmonics
-88dBc
2nd
-85
3rd
-88
4th
-87
5th
All other harmonic outputs less than 90dBc
VHF close-in spurii - 86dBc average
435MHz
300mW/195mA
1.65W/760mA
435MHz
5.80kHz
Within 20Hz
435MHz
~ 80dBc
< -90
< -90
< -90
^*1
Interleaved PCS construction of the C500
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
33
LOWE SHOPS.
packet radio
In Glasgow,
the shop manager is Sim, GM3SAIT,
the address, 4/5 Queen Margaret Road,
off Queen Margaret Drive, Glasgow,
telephone 041-945 2626.
from
In the Horth East,
the shop manager is Hank, G3ASM,
the address, 56 North Road, Darlington,
telephone 0325 486121.
In Cambridge,
the shop manager is Tony, G4NBS,
the address is, 162 High Street, Chesterton, Camhridge
telephone 0223 311230.
In Cardiff,
the shop manager is Carl, GWOCAB,
the address, c/o South Wales Carpets, Clifton Street Cardiff
telephone 0222 464154.
In London,
the shop manager is Paul, G4Pn
the address, 223/225 Field End Road, Eastcote, Middlesex
telephone 01^29 3256.
Kantronics.
lgnedAXS6 vers
toS TUC COImectfacllltl0s
features abulltln
^8
U operation
combined
with
the enhanced generic commandstructure allows
with any
computer.
EPCS
In® vat, carriage £7.00
^^5f--/VKP<d18 yourea<gitewey
Into packet
1 port 811(5
at wa flsxlhUity. Having two naoket
? on one band
S ® oryoperate
betwi encross
ports,band.
the The
KPC4KPC4
lets
you bridge two frequencies
also includes the PEESOHAl PACKET MAILBOX feature.
inc vat, carriage £7.00
^Uf^Comblne VHF packet, HE packet, CW, RTTY, ASCII and AMTOR in
1r W
*
inc vat, carriage £7.00
In Bournemouth,
the shop manager is Colin, G3XAS,
the address, 27 Gillam Road, Northbourne, Bournemouth,
telephone 0202 577760.
Lowe Electronic Shops are open from 9.00am to 5.30pm,
Tuesday to Friday and from 9.00 am on Saturday. Shop lunch
hours vary and are timed to suit local needs. For exact details
please telephone the shop manager.
1300HG
HOKUSHIN
frequency counter.
^ ^ Ideal for
0611 1
ontinnaP^Pi^^*
^ easily measures
and when used
wltL the
optional
telescope whip,
transmitter
r or hanciileld
transceivers,
low
j»wei^ 'Trug' tevlcea When
used in conjunction
witheven
a simple
r
1300HC
aerial resonance' an easy
task.makes checking tuned circuit or
The high pertonnanco of the 1300HC frequency counter makes
It an indispensable tool for eveiy aSateS
smalJ s3ze Inaiee
it suitaile for either shack or "on
spscincAiios
Sssolu'ion
100Hz at1-1300
23 sec.MHz
gate
1
kHz
at
260
mS. LED
gate
Display
a digit 03*
MHz decimal point
LeadingFast.
zero blanking
Gate times
250 mS
Sensitivity
Slow. 2.5 S
(typical) . 1-10 Mh2..„.10 - 150 mV rms
10-1000 Mhz 3 - 60 mV rms
Accuracy 1-1.3 GHz.....10 -150 mV rms
(typical) +/- Ippm, +/- 1 count LSD
o.l ppm/month (typical)
Gate Indication Red LED during sampling
Input connector
B.NC
Diput power
9 - 12 Vdc at 160 mA
Power connector Concentric. Centre pos.
Case0 — Brushed anodised alumlnlmum
5F
3.9H XBHW * ID - moiies
Weight
g^L
Power supply
Internal NICad pact
gV supplied) or external dc source (option)
1300HC Handheld frequency counter
OpflONS135'00 ^ caITla«ti ^2-00
PS18 AC8malnj
power supply
* -80 tatwhip
Pati carriage £2.00
B27C6 - • •Telescopic
••
~
aerials.
base station aerials
v^^r^ge^VOQ1611^ VemcaI'11101111188 radials£il 18.00 Inc.
OT8R..Ba(lial kit for use wlthiHP5 when mounted on cnunnev or
Itto. S? 0 metre base statiion ^>54.81 inc vat, carriage &7 00
nl ri
colinear, 6.5 dB gain, 3.1 J?metres
&
EA QP
inc vat, carriage &7.00.
mgre3...as above but 3 section colinear, 7.8 dB gain, 4.45 metres
inc vat, carriage £7.66.
£51.97
OPVy-Beventy centimetre triple 5/8 base station colinear, 6.8 dB
ta^0caS^eT7d00144/430
MOBILE AEHXAIS
^"SSiSe^.OD8 WhiP' 3'4 ^ ^ foldover base £14-55 inc
^caSSgTtaoO778 WhiP•4-5 133 ^ f01^81, base£24.S3 inc
OeGAR430..Seventy centimetre triple 5/8 whip, 6.3 dB
carriage £8.66.
£27.72 inc vat,
1131111
(144/430 MHz) whip ... £34.59 inc vat,
dlPleXerf0r
^^0SC:;AR720 • ^18.02
^•^^e£?^^
y) • £6.26 inc
PL2M nhS16 3386111111:7 for 088 bafe' complete with S0239 and
reqPlre6031,16 assemI:11
■" *7J>4® carrying
L" vat, carriage
£0.50
case £1.00
.. Banded
£9.90 Inc vat, carriage
vt^ca^iage"llSO™0™'' includlllg 031)16 andPL259 £15.42 inc
Buaoos High quality mag mount with cable and strong
USa" P^eVen,'PaiIltw°rfcdamage.. £22.90 inc v^
IiOW] I ZSIJBCTBOmCS ZiTD.
Chesterfield Road, Matlock, Dertyshire DE4 5LE
Telephone 0689 580800 (4 llr is)
p/ease mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODA Y DECEMBER 1987
Kenwood
Kenwood
TS430S
TS530SP
reduced from £974
reduced from £927
to £748
to £748
WHILST STOCKS LAST
WHILST STOCKS LAST
-4
copy of the new fbB colour KEEFWOOU
acation of ev»ry raodel xaid meessory . _
5SEE OF CHASUSS, a copy of our gertsral ca&d
epfhahcs ybur operating contASna rouch uaefbl
lat^t eiStion or our price list
the TS711E and TS811E
1
PERFECT BASE STATIONS!
Tile KS19WOOD TS711E two metre base station is perfection
epitomised; receiver sensitivity and the ahlllty to reject unwanted
adjacent signals is outstanding. For the serious operator, any other
transceiver Is unacceptahle.
Similar In specification and appearance to the TS711E but
operating on seventy centimetres is the KEHWOOD TS811E. When
used along side the TS711E, the TS81IE completes the ideal
equipment line-up and provides the best possible access to the
satellites for the VHF/DHF enthusiast.
The TS711E CTSSHE) covers the two metre (seventy centimetre)
band from 144 to 146 MHz (430 to 440 MHz). Operating modes are
XJBB, LSB, CW and FM. When switched to the "auto" position the
transceiver correctly selects mode according to frequency, a great
advantage for the blind operator. Simple up/down frequency shift is
provided on the front panels and also on the microphones.
Power output on all modes is 25 watts. For QRP operation the output
can be reduced using a front panel control.
The TS71 IE (TS81 IE) has IF shift, an essential feature when the
band is crowded during a contest. To help work DX, speech processing
is also available.
The transceiver has two seperate VTO's and forty memoiy
channels. Each memory stores frequency, operating mode, whether
simplex or repeater shift and If the 1750 Hz tone burst is on or off. The
YPO can be either free running as for SSB or CW operation or
electrically switched to a "click" stop for FM where it changes
frequency in 12.5 or 5 kHz steps. Frequencies stored in memoiy can
he readily transferred to either VFO A or B. Depending on how VFO
was set when the information was put into memory le. click stop or
free running WO, the rig is set the same when memoiy information is
transfered It is therefore possible to have SSB frequencies
transferred with a free running VFO andFM channels with click stop.
A great aid to operating! The second VFO can also he quickly put on the
same frequency as the one currently being used, ideal when checking
the position of a strong adjacent signal whilst remaining on your
operating frequency.
Frequency scan on VFO can either be between or outside user set
limits. On memory the transceiver can either scan the entire memoiy
pontent or he instructed to look at those frequencies of a particular
/mode. The TS711E(TS811E) has a timed hold on an occupied channel.
Both priority channel and Immediate recall of your local net
frequency are possible with the TS711E (TS811E).
For those with falling sight or a blind operator the TS711E
(TS811E) is a dream come true; not only is the operating mode
identified ty the appropriate CW letter sent in tone (F for FM, U for
USB etc.) hut when fitted with the VSI optional board, a digitally
encoded girl's voice will announce both frequency and, where
applicable, whether the rig is switched to repeater shift.
DCS (digital code squelch) Is also fitted to the TS711E (TS811E).
TS7X1E
£940.00 Inc VAT Carriage &7.00
"881
IB
£1094.00 inv VA! Carriage £7.00
81
V
£38.68 inc VAT Carrtrge £7.00
IiCTYB JSUSCTROITICS LTD,
CJhesterfleld Road, Matlock, Derbyshire DE4 5LE
Telephone 0629 880800 C4 lines)
HAM RADIO TODAY DECEMBER 1987
please mention HRT when replying to advertisements. 73G4NXV
35
A
Reach for your soldering iron, pardn'r, the Kanga
Gang just rode into town with a Top Band rig for
the ranch. At 15W max on SSB, and with the
option of CW, it should set them herds a
hummin...
The original idea of this set was
to take the place of the now ageing
'Whitfield' transceiver for 160 and
80 metres (Short Wave Magazine,
April to August '83). This was still
functioning well but was rather large
and the bug had bitten to make our
shacks fully home brewed again. The
set is designed for SSB or CW for the
160 metre band, to be portable and
reasonably compact. This last
demand is not usually governed by
the electronic design of the piece of
equipment but by the front panel
layout, and the 'Whitfield' is an
excellent example of this!
The Design
Fig. 1. gives the block diagram of
the set and Figs 2 to 9 the circuit
diagrams of the various sections.
In Fig. 2, the aerial signal is
filtered by the bandpass circuit of T1
and T2. 1C1 is the RF preamp, but,
using the two small relays RLA 2 and
3, it can be bypassed to improve the
large signal handling capability, for
when the set is used at night or with
a large, high-gain antenna. If this
facility is not required, the relays can
be replaced by two links permanently keeping the preamp in circuit.
The mixer, IC2, is an SBL1
device, chosen not so much for its
characteristics but for the ease of
switching the transmit/receive path
which it allows, but more of that
later. A certain amount of trade-off
has been accepted in the termination
of the mixer, but in use this does not
seem to have made much difference
to the handling of the set on the
main aerial
IF Stages
The IF signal from the mixer is
fed via a matching transformer to the
SSB filter, FL1. This device has been
introduced only recently, and is being
marketed by ILP Ltd. It is a mechanical filter of very small size with an
extremely good shape factor of just
over 2:1. This, coupled with the
selectivity of the two IF transformers
used in the receive section of the IF
strip, brings the overall shape factor
below 2:1, a very acceptable level.
For reception on AM this filter is too
narrow and two relays are used to
change to a six pole ceramic ladder
filter of 8 kFlz bandwidth, FL2.
The output from the filters is
then amplified by the IF strip. Fig. 3.
This consists of three stages using
dual-gate MOSFETs. Only two are
used in the SSB receive path as the
signal has then reached a high
enough level to drive the balanced
demodulator, of Fig. 4. The third
stage of IF amplification, Q8/T10 in
Fig. 3, is used to increase the level
of the signal to drive the AGC
detector. This detector is also used
to develop the audio for use on AM.
The resulting AGC voltage is used to
control the three IF stages by
changing the gate 2 voltages.
AM & SSB Operation
The AM or SSB audio is selected
by the mode switch and then fed to
the volume control prior to driving
the audio output device, IC7. For this
stage we use a ULN2283 integrated
circuit; this is a very versatile device
and will deliver a watt of audio into
an 8 ohm speaker.
The carrier insertion oscillator
(Fig. 5) needs little description
because it is quite straightforward in
design. There are in fact two
oscillators, built round Q12 and Q13.
The frequency controlling elements
are ceramic resonators, XI and X2.
These have two advantages over
crystals, they are far cheaper and it
is possible to 'pull' them to a much
greater degree, making setting up of
the unit easier. However, the main
I
36
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
disadvantage is that their long-term
stability is far below that of crystals,
though this is not an insurmountible
problem in a 'home brew' design, it
just means you have to realign the
oscillators periodically. One oscillator
is set to the appropriate frequency
for the lower sideband and the other
for the upper. The oscillator to be
used is selected by SWIc, which
switches the power to one or the
other. The output from the selected
oscillator is buffered by Q14.
fwl
1
Transmitter
The transmitter section (Fig. 6)
is fairly straight forward and without
any frills. ALC is not included but
instead the maximum drive level set
to a point just below flat-topping.
This does mean that the same microphone has to be used at all times, but
removes the problems that can
occur in getting the ALC to work
properly. Provision is made for ALC
to be fitted retrospectively by our
using a dual gate MOSFET in the
signal path (second gate can be used
for control).
In the original design, the
microphone signal was amplified
using an SL630 or SL1630 device;
however due to a large number of
drop-outs in the last batch of
'seconds' we bought (only in the
SL630s) this was scrapped and
replaced by a very simple single
Rx
+6V SUPPLY
FROM SWITCHING
C31
lOn
Hh
F STRIP
| R LAs) »
e
T
10n T 10n CONTROL
RF AMP'
ON/OFF
/7^7
BPF C26
22p
? f
J_
irt
4= C27 _L
T
I
nrn
R14
IC4
47RIBH
FILTERS
FL1
IC2
tL
ra
1,4,8
C30
lOn
ICS
FSf]
MIXER
lOn
rr
TO Tx LPF
TO PA
transistor stage, Q15. The gain
required is very low as the maximum
signal needed to drive the SL640 is
1 volt P/P; the microphone input level
is adjustable from a control on the
front panel.
The amplified signal is fed to
ICS, an SL640 or SL1640, to mix
nrn
rl
=01 i
270p 270a
I
ntn
+ 12V
C34
22p
F
'
Fig. 1 Block diagram of the transceiver
10p
ANTENNA
INPUT I RLA1
TO RELAY COILS
t t t t
I
lOn
,7777
NOTE:
101
102 »= SL610
S8L1 or SL1610
103,4
=
105 = 7878LOS
LOS
Q1 = 2N3819
Q2,3.4^ = BC183 or jimilar
•08 IS PART OF T3
RLAfi
013
560p I €
CV1
50p
77777
47 R
t-TTTulf use
AM SWla+12V
rrfn
LSB o
RLA5
ntn
CIO
10n
T lOn
ntn
1
024
-r-lOOn
OUT
T
CIS
ntn
JC3
COM
100n
C12
270p
+fiV.SUPPLy
SSB EXCITERON
12R
±E3
77777
Tx+ FROM
SWITCHING
lOn
6flR
017
22p
+ 12V
C16 <RS
I 100n<
IkO
R13
1k8
77^7
021
22 p
15k
Q4
47k
014 !
560p
I
I
VFO
R11
220R
«i,C22
-r* 22p
-LC23
XlOOn
Fig. 2 Circuit diagram of the RX input stage, mixer, filters, VFO and RF transmit preamp
+6VSIG GNN
TO FREQUENCY
METER UNIT
]I>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
37
TO POINTS
MARKED +8V
R25
lOOR
R32
100R
i
lOOn
lOOn
fun
fun
fnTJ
/TW
/7W
T10
NOT
USED
NOT
El USED
I
(7777
C45
lOOn
C41
InO
FROM
RLA5
CONTACT
R24
R22
H
IFDETECTOR
OUTPUT TO
CIRCUIT
R27
R20
S'METER
C36 I
lOn
I
FROM D4/R68
SSB EXCITER
STAGE
AGC
H
R31
C53
lOOn
—1— C54
T InO
R35
330R
I
NOTE:
Q6,7,8 = 3N204 or 35K85
Q9,10 = BC183 or similar
Dl^,3 - OA2 or similar
I
I
I
ICS +12V
1
T*
r 1 T
C57
056
lOOn 77/77 lOOn
R39
120k
R40 LINK A
AAV—O-1
O-J
X Cbb
-I-lOOn
R41
120k
AM/AF
OUT Q10
I
rrm
Fig. 3 The IF strip and AM detector
with the signal from the carrier
insertion oscillator. The resulting
double sideband reduced carrier
output is fed to dual gate MOSFET
amplifier stage, Q16, and then into
the SSB filter via a diode switch, —
but more of that later when we
consider CW.
It is at this point where the use
of the SBL1 Mixer 1C (see Fig. 2) is
of great advantage. Because it is bilateral, it can be used to mix the
input received signal with the VFO
to produce the IF signal, or, without
switching, it will mix the SSB signal
from the filter with the VFO to
produce the transmitter output
signal on the required band.
The signal path then splits again
and the transmit signal is fed into a
bandpass tuned circuit and then into
IC5, an SL610 or SL1610, for further
amplification to make up for the loss
in the filter and mixer stages.
Unfortunately the SL610 cannot
drive a tuned circuit directly so a
transistor, Q5, is used as an interface
to drive a second bandpass filter.
The output of this filter is clean and
of sufficient amplitude to drive a
Cirkit PA module to full output.
TX PA Control
To control the PA module using
solid state switching we have carried
out a minor modification to the bias
line. This is done by lifting links 3 and
4 from the +ve supply rail (see
Fig. 7) and using the resulting lack
of bias to turn off the PA and driver
stages. The pre-driver is left
conducting all the time as the
dissipation is low enough not to
cause any problem. The current
requirement of the bias line is in
excess of 100mA and so we have
included a bird's-nested emitter
follower (Q17 in Fig. 7) to reduce the
loading on the switching circuit.
It is also necessary to filter the
output of the PA board and the
circuit and values are given in Fig. 8.
The TR (transmit/receive)
switching system is based on a
design of Ian, G3RVM, which he
constructed to enable his Yaesu gear
to work QSK. We have adapted this
circuit, shown in Fig. 9, for our own
needs in many pieces of equipment
and have never been disappointed
with the results.
When the PTT button line is
pressed, taking the input to ground,
+1ZV
C59
ion -r
C58 run
lOn
5nHI—
FROM
IF
3 ICb
STRIP
C63
ICOn
C61
ir ,
R42 Qn
1M0
R44
6k8
VvV
C64
InO
065 > R45
InO >100k
SWlb
LS8
C68
lOOn
X R47
067
InO 100k /7777
77777
77777
"□ + C89
-T- lOOu
nh?
2,3, ^ C70
] 2u2
6.7
R46
100k
vw
060 J!
lOOn
XFROM
CARRIER
INSERTION
OSCILLATOR
USB
/
AM AUDIO FROM
IF/DETECTOR
SKI
PHONES
C71
lOOu
LSI
NOTE:
IC6 - SL640 or SL1640
IC7 = ULN2283
Q11 = BC183 or similar
Fig. 4 SSB detector and audio output stage
38
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
USB
AM
R48
'470k
C73
>50 /7 <~100n
7
.IkO "
CV2
9-50p
^^
XTAL1
Q12
C72
560p
. R51
'470R
C74 J560p I
rrni
► 56('
+12V
R54
22k
~L C77
± 100n
R53
. IkO /7^7 C79
220p
R56
10k
□14
C78
560p
□13
X
C76
560p
I
LSB
9C503p
XTAL2
>R49
SWIc
R55
22k R57
1k5
1u0
CIO TO SSB
DETECTOR
R52
56k
T
C75 ■
220p~r
C81
luo
R58
IkO
^
exciter
NOTE:
Q12,13,14 = BC182 or similar
XTAL1 = 455B CERAMIC FILTER
XTAL2 = 455H CERAMIC FILTER
Fig. 5 Carrier insertion oscillator
CUT TRACK FOR CW
H67
2k 2
R65
100R
Tx+
CW JACK SK2
R59
470k
-A/VV
Q15
0
MIC INPUT SK3/ O
± C86
100n
fun
R60
IkO
1 C84
iOOn
I
I
C90
TOn "T"
nrn
Til
C92
10n
rrm
016
IC8
>7777
MRV3
47k
zj-z C87Ti
IC9a pin 2 goes from low to high and
C100 charges up via R70, also D5
conducts causing IC9e pin 13 to go
low and so pin 12 goes high. This
turns on Q19 which energises the
aerial relay, RLA1, taking the aerial off
the receiver and connecting it to the
output of the low-pass filter. While
this has been happening C100
reaches a potential which will
change the state of IC9b and pin 6
will go low so discharging C101 via
R71. The potential on pin 3 willreduce and after a finite time IC9c
will change state and pin 4 will go
high. This whole action will take
between 10 and 15 milliseconds.
HAM RADIO TODAY DECEMBER 1987
1
J
TO C36
STRIP
R66 >S R68
330R
2k2
FROM KEYED CARRIER
OSC CIRCUIT
rrm
NOTE;
IC8 = SL640or
Q15
BC183 ororSL1640
similar
Q16 == 3N204
35K85
D4 = 1N414a
•ADJUST ON TEST
Fig. 6 Mic input, SSB exciter and transmit IF amp
rrjn
C88
J 2u2
K62 >> 100k
R64
68k
FROM CIOC81
Two things happen now: IC9f
will change state and the output on
pin 8 will go low; secondly D6 will
conduct and charge C102 via R72.
This will turn on IC9d and pin 10 will
reduce to zero. When the PTT is
released the aerial relay, RLA1, will
hold on due to pin 10 being low and
this will remain low until the charge
in C102 has discharged via R72, R73
and RV4. The charge cannot discharge back into IC9c due to the
presence of D6. RV4 therefore
adjusts the 'hang' time from a few
millisecond to upwards of one
second.
However the keyed output on
FROM PA
OUTPUT
C95 •
1500p"
L4 25T
26SWG
C96 •
1500p*
TO AE
SKT VIA
L5 25T REFLECT26SWG
OMETER
-nsisvT6S.2
- C97
■ C98
1500p
'1500p
nfn
Fig. 8 Low pass filter circuit for the
transmitter output
IC9f pin 8 follows the 'keyed output'
on IC9a pin 1 delayed by about 15
milliseconds.
Next month we will be covering
the construction and alignment of
the Top Band tranceiver project.
Please mention HRT when replying to advertisements.
39
r
+13.8V O
I—I
B B
LINK 1
c; LINK 2
I
fnTl
fun
I~1
i^r
-ti—innr—
mri
1
I
r-1
INPUT
50R
—vw
JT"
I
I
O ov
m7
—vvv
Wy^
NOTE:
Q17 = BC183
I
OUTPUT BIAS
EHd
LINK 3
DRIVER BIAS
^■O □ t
1
LINK 4
□17
FB
o3
♦ C93
J_
T" lOn
/W7
Fig, 7 Modified Cirkit
PA module
mn
C11
lOn
I
DVO
o ov
+ 12V
47R76R
1C9 PIN 14
R69
10k
PTT LINE
IC9a
luO
RLA1
R70
18k
IC9b
77777
iC9d
ICac
R75
2k2
c
Q19
R73
C101
470n
C
470n
1C9 PIN 7
7
R71
18k
ZD1
77777
K? 470k
RV4
+8V
rrm
Q18
TO ALL POINTS
MARKED Rx+6V
I
77^7
ALL POINTS MARKED +12V ON THIS
AND OTHER CIRCUIT DIAGRAMS
+ 12V
NOTE:
IC9 = 40698
□ 18-22 = BC183 or similar
D5,6,7 = 1N4148
D8 =1N4001
IC9f
R77
10k
Q20
021
□22
TO ALL POINTS
MARKED Tx +12V
C106
lOn
Fig. 9 The switching control circuitry
40
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
c
]
A
TO
J
1 Nov
2 Nov
3 Nov
4 Nov
5 Nov
6 Nov
7 Nov
8 Nov
9 Nov
10 Nov
Camarthen ARS Rally, Leisure Centre,
Johnstown. Details from GW3GUE on (026783)
460.
Stourbridge DARS: Night on the air.
Welwyn/Hatfield ARC: Construction competition.
Todmorden DARS: 'Bash the Committee' — air
your views.
Southdown ARS: Construction evening.
Felixstowe DARS: Night on the air.
Hambleton DARS; Talk 'Log checking with a
computer program' by Pieter Smit.
Sutton & Cheam RS: Natter night.
Rugby ATS: Fireworks & barbecue.
Dartford Heath DFC; Pre hunt meeting. Horse &
Groom.
Loughborough ARC: Night on the air.
Fylde ARS: Equipment sale.
Wakefield DRS: Pea & pie supper.
Chester DRS: Committee meeting,
SE Kent YMCA ARC: Natter night.
Fareham DARC: Talk 'Amateur radio in the Royal
Navy' by G3JFF.
Willenhall DARS; Talk 'Microwaves' by D Acrill
GODJA.
S Bristol ARC; Talk 'CW operating'.
Chesham DARS: Natter night.
Mid Sussex ARS: Fireworks on the air.
Bredhurst RTS; Construction & natter night.
Yeovil ARC: Talk 'Simple HF aerials' by G3GC.
Salop ARS: Talk 'Model steam engines' by
GOEBD.
E Kent RS: Talk 'Kanga amateur radio kits' by
Dick Pascoe GOBPS & Ian Keyser G3ROO.
Mansfield ARS: RSGB Video.
Loughton DARS: Film show.
OK DX Contest (also 8th)
BARTG: AGM at The Churchill Room, London
House, Meckleburgh Square, London.
North Devon Radio Rally, Bradworthy Memorial
Hall. Details from G8MXI, QTHR.
North Wales Radio Rally, Aberconwy Conference
Centre, Llandudno. Details from Derek Watts on
(0492) 530041. Also on 8th.
Dartford Heath DFC: Club hunt, 2.30 pm,
Dartford Heath.
Sheffield ARC; Junk sale & sausage spectacular.
Atherstone ARC: RSGB film.
Keighley ARS: Informal meeting.
Dorking DRS: Informal meeting.
Loughborough ARC: Film show.
Biggin Hill ARC: Surplus equipment sale.
Delyn RC: Informal meeting.
Verulam ARC: Activity evening.
Rugby ATS: Slide & talk by Mr Powers of the
IBA.
Chester DRS: Talk 'The TR940S' by Dave
G4JMF.
HAM RADIO TODAY DECEMBER 1987
11 Nov
12 Nov
13 Nov
15 Nov
16 Nov
17 Nov
18 Nov
19 Nov
20 Nov
22 Nov
23 Nov
24- Nov
Trowbridge DARC; Natter night.
Bath DARC: Microwaves.
Wirral DARC: Chairmans night.
SE Kent YMCA ARC: 2m fox hunt.
Lothians RS: Junk sale.
S Bristol ARC: CW activity evening.
Chesham DARS: Talk & demo 'High power linear
amps'.
Farnborough DRS; AGM.
North Wakefield RC: Night on the air.
Mid Sussex ARS: Talk 'Remote imaging' by Des
Watson G3YXO.
Bredhurst RTS: Talk 'AX25' by Chas G4VSZ.
Salop ARC: Talk 'Field strength & power
density' by G3MYM.
Southgate ARC: Construction competition.
Edgware DRS: Film evening.
Wimbledon DARS: Activity evening.
Itchen Valley RC: Talk 'Getting started on
50MHz' by G Sanderson G2DBT.
Dunstable Downs RC; RAE opening evening.
Bridgend DARC: Bridgend Rally at the Bridgend
Recreation Centre, Angle Street, Bridgend, Mid
Glamorgan. Doors open 11.00 am (10.30 am for
disabled visitors). Free parking, bring & buy,
morse test. Talk in on S22. Further details from
Dave, GW10UP, on (0656) 723508.
Stourbridge ARS: Annual surplus sale.
Todmorden DARS: Natter night.
Felixstowe DARS: Social evening.
Midland ARS: Home Construction Competition.
Mansfield ARS: Talk 'The grid dip oscillator' by
Keith G4AAH.
Loughborough ARC: Annual dinner.
Wakefield DRS: Talk by G1LTU.
Fylde ARS: Informal meeting.
Chester DRS; Talk 'Clandestine radio — part 2'
by Gordon Adams G3LEQ.
Hastings ERC: Talk 'The Phillips compact disk'.
SE Kent YMCA ARC; Natter night.
S Bristol ARC: ATV activity evening.
Chesham DARS: AGM.
Mid Sussex ARS: Night on the air.
Bredhurst RTS; The G4EGH Ingenuity Trophy.
Salop ARS; Talk 'The lead mines of SW
Shropshire' by G4ZZP.
E Kent RS: Natter night.
Yeovil ARC; Talk 'RTTY — part 2' by G8AWB.
Sutton & Cheam RS: Talk 'BBC external
services'.
Loughton DARS: Informal evening.
Wakefield DRS: Visit to Jodrell Bank.
W Manchester RC Winter Rally, Pembroke Halls,
Walkden. Details from G1IOO on (0204) 24104.
Atherstone ARC: AGM
Loughborough ARC: Construction night.
Wakefield DRS: Novelty project judging.
Please mention HRT when replying to advertisements.
4t
25 Nov
26 Nov
27 IMov
30 IMov
1 Dec
2 Dec
3 Dec
4 Dec
5 Dec
6 Dec
7 Dec
8 Dec
9 Dec
10 Dec
42
Delyn RC; Informal meeting.
Verutam ARC: Talk 'Advanced receiver
technology' by Robin Hewes G3TDR.
Rugby ATS; 144IVIHz AFS Contest planning.
Trowbridge DARC: Visit by Region 17 Rep.
Bath DARC; Open night.
SE Kent YMCA ARC: Club project discussion.
Lothians RS; Talk 'Propagation with an HF bias'
by T Main GM4DCL.
S Bristol ARC: Discussion — events for 1988.
Chesham DARS; Talk 'The history of stereo' by
Tony G4BPC.
Farnborough DRS: Chairmans evening.
Keighley ARS: Film show.
North Wakefield RC; Monthly meeting.
Mid Sussex ARS: Talk 'Air navigation in World
War 2' by Len GOAPZ.
Bredhurst RTS: Talk 'Regenerative Receivers' by
Stan White G4EGH.
Salop ARS; HF night on the air.
Yeovil ARC: Natter night.
Southgate ARC: Informal evening.
Edgware DRS; Talk 'SWR topics'.
Wimbledon DARS; Mini lecture.
Itchen Valley RC: Talk 'Radio' by Len G6NZ.
Felixstowe DARS: Social evening.
Loughborough ARC; Night on the air.
Wakefield DRS; Night on the air.
Fylde ARS; Construction competition.
Chester DRS: Committee meeting.
Fareham DARC: Talk 'Bobbins, baluns and
beads' by G3CCB.
S Bristol ARC: Test equipment rally.
Chesham DARS; Natter night.
Mid Sussex ARS: Night on the air.
Bredhurst RTS: Construction & natter night.
Salop ARS; Talk 'Drug abuse' by Community
Police Officers.
E Kent RS: Annual cheese & wine party.
Yeovil ARC; Talk 'VHF propagation & choosing a
site' by G3GC.
Mansfield ARS: Christmas party.
Loughton DARS; Night on the air — 6m.
RSGB AGM.
144IVlHz fixed & AFS contest.
Verulam ARC Christmas Rally, St Albans City
Hall. Details from G4JKS on (0727) 59318.
Stourbridge DARS: Night on the air.
Welwyn/Hatfield ARC; AGM.
Todmorden DARS: George Dobbs Annual Xmas
Lecture.
Keighley ARS; Informal meeting.
Midland ARS: Christmas Party.
Dorking DRS: Informal meeting.
Dartford Heath DFC: Pre hunt meeting. Horse &
Groom.
Loughborough ARC; Film show.
Biggin Hill ARC; Tape & slide show and
Christmas celebration.
Bury RS: AGM.
Delyn RC; Informal meeting.
Chiltern ARC; Christmas party.
Trowbridge DARC: Natter night.
Bath DARC; Christmas party.
SE Kent YMCA ARC; Talk 'How to work meteor
scatter' by Ken Willis G8VR.
S Bristol ARC: Discussion — club project.
Chesham DARS; Talk 'Technical topics'.
Farnborough DRS: Christmas social evening.
Mid Sussex ARS; Club Christmas Dinner.
Bredhurst RTS: Talk 'Building GB3KN'
■
(yeLL. THAT'S IT
T'*4 Fi/u-f' c.oi-if'e.enej> /VocJ—
fH>W c^o^r' T
Edgware DRS: Annual junk sale.
Salop ARS: Natter night.
11 Dec Wimbledon DARS; Social evening.
Itchen Valley RC: Christmas party.
Dunstable Downs RC: Christmas TV show via
GB3TV.
13 Dec Dartford Heath DFC: Club hunt, 2.30 pm,
Dartford Heath.
Leeds DARS Christmas Rally, Pudsey Civic
Centre. Details from G4WYD on (0274) 658039.
14 Dec Sheffield ARC: Pea & Pie supper.
Felixstowe DARS: Christmas drinks, Grosvenor
Hotel, Felixstowe.
Atherstone ARC: Talk 'Central Electricity
Generating Board' by R Hammond.
15 Dec Dartford Heath DFC: EGM.
Mansfield ARS; Talk 'The oscilloscope' by Mike
G8GNN.
Loughborough ARC: Construction night.
Fylde ARS: Hot Pot supper at club.
Rugby ATS: Annual Christmas Dinner.
Chester DRS: Construction contest.
16 Dec Hastings ERC; Christmas social.
SE Kent YMCA ARC; Christmas social.
Fareham DARC: Talk 'Taking the morse test' by
G3TZL,
Chesham DARS; General meeting.
17 Dec North Wakefield RC; Christmas dinner.
Bredhurst RTS: Construction & natter night.
Salop ARS: Christmas social.
E Kent RS: Natter night.
18 Dec Sutton & Cheam RS: Christmas get together.
Loughton DARS: Christmas dinner.
Dunstable Downs RC: Members Christmas Party.
21 Dec Stourbridge DARS: Main meeting.
Todmorden DARS: Natter night
22 Dec Rugby ATS: Mince pie evening.
Loughborough ARC: Christmas drink in The
Black Swan.
Wakefield DRS: Christmas social.
Delyn RC: Informal meeting.
Chester DRS: Christmas meeting.
23 Dec Trowbridge DARC: Christmas Party.
Chesham DARS: Drinks & sandwiches, at the
Queens Head.
29 Dec Chester DRS: Drink & waffle.
Will club secretaries please note that the deadline for
fhe February 1988 Segment Of Radio Tomorrow, (covering
radio activities from 1st January to 1st March) is
1 8th November.
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
Aberdeen ARS
Don
0467 6251
Abergavenny & NH ARC
GW4XQH
0873 4655
Aberporth ARC
GWODPR
023987 274
Aire Valley RS
G6NFT
0532 44597
Alyn and Deeside ARS
GW4RKX
0244 660066
Amateur Radio & CC
Trevor
04895 81032
AMRAC
Phil, G6DLJ
0703 847754
Armagh & Dungannon DARC J. A. Murphy 0861 522153
Atherstone ARC
Roy
0203 393518
Axe Vale ARC
Bob
02974 5282
Ayr ARG
GM3THI
0292 42313
Barking RES
R. Woodberry 01 594 4009
Barry College RS
John
065679 710
Basingstoke ARC
Dave
07356 5185
Bath DARC
G4UMN
0373 63939
Biggin Hill ARC
G3UMI
01 462 2689
Borehamwood Elstree ARS Tony
01 207 3809
Braintree ARS
Pub Sec
0376 28714
Bredhurst RTS
Kelvin GOAMZ 0634 376991
Bridgend DARC
Dave
0656 723508
Brighton DARS
Peter
0273 607737
Binstead ARS
Douglas
0893 67665
Bristol ARC
G4YOC
0272 4116
Bristol (Shirehampton) ARC Ron Ford
0272 770504
Burnham Beeches RC
G6EIL
0628 25720
BT (Reading) ARC
G4MUT
0734 693766
Bury RS
Allan
0204 706191
Cambridge DARC
D. Wilcox
0954 50597
Chesham DARS
Liz, GOETU
09278 3911
Cheshunt DARC
G4VMR/G4VSL 092084 250
Chester DRS
Dave, G8ZRE 0244 336639
Chichester DARC
C. Bryan
0243 789587
Clacton ARS
Reg
0255 430466
Chiltern ARC
Ron, G3NCL 0494 712020
Clifton ARS
RA Hinton
01 301 1864
Conwy Valley ARC
GW4KGI
0745 823674
Coulsdon ATS
Alan
01 684 0610
Coventry ARS
Bill, G3U0L
0203 414684
Crawley ARC
Jack
0293 28612
Darenth Valley RC
Sec
0322 63368
Dartford Heath DFC
Pete
0322 844467
Delyn RC
Sec
0244 819618
Denby Dale DARC
G3SDY
0484 602905
Derwentside ARC
G1AAJ
0207 520477
Donegal ARC
EI3BOB
074 57155
Dorking DRS
John
0306 77236
Droitwich DARC
G4HFP
0299 33818
Dudley ARC
John
0384 278300
Dunfermline RS
GMODYD
0383 413440
Dunstable Downs RC
Phill Morris
0582 607623
Eastbourne EARC
G1BRC
0323 29913
East Kent ARS
Stuart
0227 68913
East Lancashire ARC
Stuart
0254 887385
Edgware DRS
G4IUZ
0707 65707
Exeter ARS
Roger Tipper 0392 68065
Fareham DARC
Alan, G3CCB 0329 288139
Farnborough DRS
Mr Taylor
0252 837581
Felixstowe DARS
G4YQC
0473 642595
Fishguard DARS
Bernard
0348 872671
Fylde ARS
F. Whitehead 0253 737680
Galashiels DARS
GM3DAR
0896 56027
Glossop DARG
G4GNQ
QTHR
Gt. Lumley ARES
G4MSF
091 4693955
Gt. Peterborough ARC
Stan
0733 69822
Halifax DARS
D. Moss
0422 202306
Harpenden ARC
G1BJC
05827 2455
Harrow RS
Tony
01 861 0419
Hastings ERC
Dave Shirley 0424 420608
Haverhill DARS
Rob Proctor
0787 281359
Havering DARC
GOBOI
04024 41532
Hillingdon ARC
Howard, G6SII 01 561 2917
Hornsea ARC
Richard
0401 62498
Horsham ARC
Paul, G4YFY 0403 87 404
Inverness ARC
Brian
0463 242463
Itchen Valley RC
G1IPQ
0703 736784
Keighley ARS
G1IGH
0274 496222
Kidderminster DARS
Tony
0562 751584
Kingston DARS
G30DH
Epsom 26005
HAM RADIO TODAY DECEMBER 1987
Lagan Valley ARS
Jin GI4TCS 0846 682474
Leeds DARS
G1EBS
0274 665355
Leighton Linslade RC
Pete Brazier
052 523 270
Lincoln SWC
Ram, G4ST0 0427 788356
Lothians RS
Robin
0506 890177
Louth DARC
G1IZB
047286 595
Loughborough ARC
Philip
0509 412043
Lough Erne ARC
Bill
0365 24905
Loughton DARC
G4FKI
0525 714591
Macclesfield DRS
G1NUS
0625 24534
Maidenhead DARC
Colin
0628 25443
Maidstone YMCA ARS
GOBUW
0622 30544
Maltby ARS
Keith, G1PQW 0709 814135
Medway ARTS
Tony
0634 578647
Midland ARS
G8BHE
021 422 9787
Mid Sussex ARS
GOGMC
07918 2937
Mid Ulster ARC
Sam
076 22 22855
Mid Warwickshire ARS
G4TIL
092 681 4765
Milton Keynes DARS
Mike, QOERE 0234 750629
Morecambe Bay ARS
G4ZJL
0524 52042
N. Bristol ARC
Alan Booth
0272 690404
N. Cornwall RS
J. West
0288 4916
N. Staffs ARS
G6MLI
0782 332657
IM. Wakefield RC
Steve
0532 536633
Newbury DARS
G3VOW
0635 43048
Newport ARS
GW6ZUQ
02912 6867
Norfolk ARC
Andy
Norwich 610874
Oswestry DARC
Brian
0691 831023
Peterborough RES
Peter
G4PNW QTHR
Plymouth ARC
G4SCA
0752 337980
Pontefract DARS
Colin, GOAAO 0977 43101
Poole ARS
GOEQV
0202 674802
Preston ARS
George
0772 718175
Reading DARC
Steve, G4YFB 0734 867820
Rhyl DARC
GW1PLI
097 888 621
Rugby ATS
Kevin, G8TWH QTHR
Salisbury RES
Neil
0980 22809
Salop ARS
Simon, GOEIY 0743 67799
Sheffield ARC
John
0742 581766
Shefford DARS
Alan, G4PS0 0462 57946
S. Bristol ARS
Len Baker
0272 834282
S. Cheshire
Chris
07816 73185
S. Lakeland ARS
G4VKE
0229 65359
S. Manchester RC
Dave Flolland 061 973 1837
S, Tyneside ARS
G4XWR
091 543955
S. E. Kent (YMCA) ARC
John
0304 211638
Southdown ARS
P. Flenly
0323 763123
Southampton: See Waterside.
Southgate ARC
Dave, G4YLL 0992 30051
Spen Valley ARS
G4MLW
0924 409739
Stevenage DARS
G6EDA
0438 724991
Stockton DARS
John Walker
0642 582578
Stockport RS
Mel
061 224 7880
Stourbridge DARS
G3Z0M
0384 288900
Stowmarket DARS
M. Goodrum 0449 676288
St Helens DARC
A. Riley
051 430 9227
Surrey RCC
John
01 657 0454
Sutton & Cheam RS
John, GOBWV QTHR
Swale ARC
B. Hancock
0795 873147
Taunton DARC
Peter
0823 75973
Telford DARS
Tom Crosbie
0952 597506
Three Counties ARC
Keith, GOBTU 0730 66489
Tiverton SWRC
Alan
0392 881569
Todmorden DARS
G1GZB
070 681 7572
Trowbridge DARC
Ian
0380 830383
V of Evesham ARC
Paul
0386 831508
V White Horse ARS
I White
0235 31559
Verulam ARC
Gerry
0727 52003
WACRAL
G4NPM
0795 873147
Wakefield DRS
G4VRY
0532 820198
Warrington ARC
Paul, GOCBN 0925 814005
Waterside SWC
Bernie Lyford 0703 893937
Welland Valley ARS
J. Day
0858 32109
Welwyn & Hatfield ARC
Kevin, G4WLG 0707 335162
West Kent ARS
B. Guinnessy 0892 32877
Westmorland RS
G. Chapman 0539 28491
White Rose ARS
G4ATZ
0937 842790
Wigston ARC
G6HAJ
Leicester 403105
Willenhall ARS
Dave, GOEGG 0902 734475
Wimbledon DARS
George
01 540 2180
Winchester ARC
Gordon
0703 772191
Wirral DARC
Peter
051 677 7376
Wolverhampton ARS
Keith
0902 24870
Worcester DARC
D. Batchelor
0905 641733
Worksop ARS
G4ZUN
0909 486614
Wythal RC
G1MEE
0546 824705
Yeovil ARC
David, G1MNM 0935 79804
308 ARC (Surbiton)
Bob
01 391 0788
Please mention HRT when replying to advertisements.
43
I
)
LGSLG
m •. w.
ConrtfminQ Qso wlf'n
The LG5LG QSL card (the SJ9WL card
is identical, other than the call-sign).
It is a well-known fact that the
Scandinavian countries are not
cheap places to stay. A typical hotel
room in Sweden is about £60 per
night and a glass of beer over £3.
And Norway is even worse — the
Norwegians frequently cross the
border into Sweden to buy their
booze, because they consider it to be
cheap! So the idea of a cheap
amateur radio holiday combined with
beautiful Scandinavian lake-land
scenery sounds like a contradiction
in terms.
Special offer!
So, how about hiring a whole
house, complete with HF and VHF
transceivers, a 60 foot mast, beam
antennas and two unique prefixes, all
for £10 a night, no matter how many
people you want to cram in? Sounds
too good to be true? No, it is true, the
place is called Morokulien, it is
located right on the NorwegianSwedish border near the town of
Charlottenberg, and I went there for
a weekend at the end of August last
year.
How to book
Any radio amateur can book the
house and it is not even necessary
to have Swedish or Norwegian reciprocal licences, a photo-copy of a
British licence is perfectly adequate.
However, because the place is such
good value it is naturally very
popular, especially with LA and SM
amateurs, who often book it several
months in advance.
To book Morokulien, write to the
genial host, Mr Einar Jansson,
SM41M, Gardesgatan 5, S-670 50
Charlottenberg, Sweden, enclosing
a self-addressed envelope and at
least one IRC for his reply. If possible
book several weeks or months in
advance and try to give one or two
alternative dates in case your
preferred date is already booked. If
you do try to book at short notice,
why not give Einar a phone call? (he
speaks excellent English). His
number,
from the
UK,
is
010-46-571-20093.
The house is then a few hundred
yards further along, on the right hand
side (if you are coming from
Sweden) and can't be missed on
account of the 60 foot mast! If you
don't have a car, the closest railway
station is at Charlottenberg, from
where it is possible to get a taxi for
the four or five kilometres to
Morokulien.
Your 'hotel'
When you arrive at Morokulien
you will find a house with a large
living-cum-dining room comfortably
furnished with two sofas, pine wood
tables and chairs, a black and white
television set and a handsome Scandinavian wrought iron wood-burning
stove for heating the house during
the winter months, when the snow
lies several feet thick in this part of
the world. The walls are covered
with DXCC certificates and other
awards and pennants from various
international societies, including the
Just try booking this place through your local travel
agent! Steve Telenius-Lowe, G4JVG, heads north in
the name of DX ing and ends up in Sweden — or is
it Norway!
Getting there
The easiest way to get to
Morokulien is with your own car. It
is on the road number 61 between
Eda in Sweden and Magnor in Norway. When you arrive at the border,
stop at the customs house (Tull) and
show the customs officer your
amateur radio licence. He checks
your callsign against the booking list
and will hand you the key to the
Morokulien house upon receipt of
the necessary amount of Kroner
(100 Swedish or Norwegian Kronor
per night, except in the height of the
summer season or during Scandinavian holidays, when it is 150
Kronor).
RSGB. Just off the lounge is the
shack, which leads to the combined
kitchen and bedroom. There is an
electric cooker and a selection of
pans, crockery and cutlery, so it is
possible to be entirely self-catering
here. You should, however, bring your
own bed linen or sleeping bags, and
towels, but just about everything
else imaginable is provided.
There are two double bunk beds
in the bedroom and the sofas in the
lounge convert into double beds as
well, so it is possible to sleep a total
of eight people in reasonable comfort — providing they are all quite
friendly with each other! Einar tells
me, though, that the record is 26
,■ ■
44
Please mention HPT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
4
The Morokufien house, complete with 2m and HF beams, and 40/80m
dipoles.
Scouts during 'Jamboree on the Air'
one year!
Local attractions
Apart from the radio station, the
area called Morokulien contains a
small cafe and shop, tourist information, a petrol station, a camping site
and log cabins for hire to those who
are not radio amateurs. There is also
an eighteen metre high granite peace
monument, erected in 1914 to commemorate one hundred years of
peace between Sweden and Norway, and this is now one of the
border markers.
Interestingly,
the
border
between the two countries runs right
through the house in which the
amateur radio station is situated, and
this must have given the authorities
something to think about when
issuing a callsign for the place! In the
event two callsigns were issued, one
with a Norwegian and one with a
Swedish prefix. Today, these calls are
HAM RADIO TODAY DECEMBER 1987
LG5LG and SJ9WL, and both callsigns can be used from the same
station, although not at the same
time of course. Separate log books
are provided for the operator to use,
with a note to only use one log book
at a time.
'Hotel' facilities
The shack is well-equipped, with
an Icom IC-720A transceiver for the
short wave bands, and an Icom
IC-251E multi-mode transceiver for
2 metres. There is also RTTY terminal unit and printer, bug key and a
choice of standard 'hand-pumps'.
The antennas provided are a
TH6Dxx 6 element beam for 10, 15
and 20 metres on top of the mast
and above this is a ten element
crossed beam for 144 MHz. The
mast also supports a 40 metre
sloping dipole plus 80 and 40 metre
dipoles on the same feeder, but there
are no antennas at present for either
160 metres or any of the new WARC
bands.
The station gets out extremely
well on the higher frequency bands
but less so on 40 and 80 metres: the
combined 40'80 dipole on the same
feeder possessed a high SWR and
did not seem to radiate very well —
nevertheless it was still possible to
work back to England on 80 metres
SSB during the late evening. On 20
metres, it was easy to work South
Americans in the morning, Japanese
and other Far Eastern stations in the
afternoon, and Africans in the early
evening. By way of example the best
DX worked on 20 metres SSB whilst
I was there included JT1BU, VQ9GB,
5X5MB, 5Z40T, 9M2BB and
9M6AE.
Creating pile-ups
It was also easy to generate a
pile-up at any time on 20 metres,
with prefix-chasers anxious to
contact the LG5 or SJ9 prefixes,
both of which are unique to
Morokulien. Conditions were very
poor on 10 and 15 metres when I
was there, so I did not use those
bands: nor did I use the 2 metre
equipment, though with a ten
element beam more than 60 feet
high, there is no reason to think that
results there would not be equally as
good.
So, next time you are in
Scandinavia, instead of paying
outrageous hotel bills, stay a few
days at Morokulien, and be a DX
station for a change!
Morokulien in winter — you are
advised to visit in summer unless cros:
country ski-ing is another hobby!
Please mention HRT when replying to advertisements.
45
CD
n
TV
A
REVIEW
*
I
**f ""3 WSC&VBR
CAt-tl CAU2
LOCK
OUP-
Alinco have been producing amateur
radio gear in Japan for some time
now, but their sets are still relatively
unknown amongst UK radio amateurs. With so many 2m mobiles now
OUP+
.1
3
S
7 9
S/flF
size as well as the operating frequency and selected repeater shift.
Frequency control is performed
by using either the main rotary
tuning knob or up/down buttons
As two metre mobiles shrink in size, could the
market share of the big three diminish too? A new
name to the UK, Alinco, certainly could find some
room over here, as Chris Lorek, G4HCL, discovers.
on the market, the purchaser faces
a bewildering choice. We've featured
the latest offerings from the 'big
three' Japanese manufacturers in the
last few issues so let's see what
Alinco are offering.
Features
The set is, not surprisingly, tiny
and measures 140mm(W) x
40mm(H) x 164mm(D), this allows
it to fit in the smallest of car
dashboards. All connectors are
moulded onto flying leads emanating from the rear of the set. This
allows great flexibility in the set's
mounting position and also removes
any nasty eye-poking projections
from the car's facia.
The set covers 144-146IVIHz in
12.5 and 25kHz steps, with a selectable transmitter output powers of
5W or 25W (a higher power version,
the ALR-22H, offers 45W maximum). Two VFOs are fitted wh;ch
independently store channel step
46
PW
fitted to the fist microphone, further
up/down buttons on the set's facia
give a 1MHz shift with each
depression. A standard 600kHz Tx
offset is provided for repeater
operation, and this may be reprogrammed to give non-standard shifts
if required (within the frequency
coverage limitations of the set).
A DUAL function is also available, allowing Rx operation on one
VFO frequency and Tx on the other
VFO. Reverse repeater checking is
available by a two-button push and
a CALL button keys the transmitter
whilst sending a 1750Hz tone for
repeater access.
Memories
Twenty-one memory channels
are available, each storing the operating frequency and any programmed offset. Access to these is by a
press of the MR button, the faciamounted up/down buttons then controlling memory channel selection.
Although not mentioned in the user
manual supplied, operating the
rotary tuning knob or the microphone-mounted up/down buttons
places the set into VFO mode, allow-
Details of the top panel switches
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
©
.
Internal top view of the Alinco
ing you to QSY from any selected
memory channel. Quick access to
memory channels 1 and 2 is provided by the CALL button.
Scanning of selected memory
channels is initiated by a press of the
facia-mounted scan button, the set
halting on the first busy channel
found, and resuming either immediately or four seconds after the
squelch closes, this being selectable
from a small top-mounted slide
switch. An adjacent switch alters
the scan rate to either four or 20
channels per second. The scan is
cancelled by a further press of the
SCAN button.
A further search facility is available in VFO mode, the scan function
in this case searching in the programmed VFO steps between the
frequencies programmed in memory
channels 20 and 21. A 'priority'
check facility samples a pre-programmed channel for one second
every six for activity, this continuing
until the 'VFO A.'B' button is
pressed. A selectable LOCK function
may be used to protect against accidental frequency shifts.
Each button press is accompanied by a bleep from the set's
speaker, varying in sympathy with
the volume control setting this bleep
may be disabled by a small slider
switch if required. Dual concentric
rotary controls are fitted for power
ontoff,'volume and squelch. A back-
lit LCD shows the operating frequency, selected memory channels,
bar-type markers for VFO, duplex,
dual, call channels and priority watch
operations, and a graphical S/RF output indicator.
A small internal speaker is fitted
to the underside lid, and the rear of
the case houses a 3.5mm socket to
enable an external speaker to be
used. The set weighs 1.2kg, and
comes supplied with a mobile
mounting bracket and fixing hardware, a fist microphone, a DC power
lead fused in each lead with spare
fuses provided, an external speaker
plug, and a user manual giving operating instructions and part of the
circuit diagram.
Impressions
Alinco appear to be keeping up
with the trend for very small mobile
sets, its small size and smart, hi-tech
appearance undoubtedly being
strong selling points. I'm pleased to
see the use of flying leads at the rear
of the set. It never fails to amaze me
that, while car designers spend so
much time making their modern
dashboards safe, radio users mount
their sets with projecting mic plugs
right in the middle, which limits the
view of the controls as well as being
a danger in its own right.
The supplied mounting bracket
is a 'quick release' type, which allows
easy removal of the transceiver
rather without the need for several
minutes with a screwdriver to get
the set out; this may be either an
advantage or disadvantage to you.
I've heard several tales of thieves
simply hacksawing a section of
dashboard out to steal the radio, the
moral being take it with you if you
want to keep it!
The operating booklet provided
is sadly lacking in the simple internal
adjustment positions, such as peak
deviation and mic gain, and does not
even mention (never mind show the
position of) the back-up battery that
will need replacing after a period of
use. This appears to be in keeping
with the trend of some manufacturers to treat licenced purchasers as
black box appliance operators; however, a technical workshop manual
for the set should become available
in due course.
Technicalities
Opening the set shows remarkable similarities in construction techniques with other Japanese amateur
sets; as with cars I believe soon only
the maker's badge will be a guide as
to who it comes from! A solid diecast chassis is used to contain the
single 'motherboard' housing the
analogue RF circuitry, two subboards housing the digital circuitry
being mounted onto the front panel
(the elusive back-up battery is sandwiched in between!).
Chip components are mounted
on the underside of the RGBs, with
coils, filters, and other discrete components fitted to the topside. Inside
the case, there is a clearly evident
space for a cooling fan, combined
with airflow ducts in the chassis
showing the same mechanics are
also used for a higher power version.
The block diagram shows that a
standard arrangement is used for the
receive side, a 3SK129 FET being
used in the front end and with a
single-gate 2SK192 mixer converting
down to the 21.6MHz first IF. The
usual TK10240 FM IF sub-system IC
(the manufacturer of these must be
making a fortune!) is used to perform
further amplification, mixing,
squelch detection and FM discrimination, a uPC2002 block audio amplifier IC boosting the recovered audio
to loudspeaker level.
On transmit, the processed microphone audio directly modulates
the final frequency voltage controi][>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
47
a uPD571 dual-modulus prescalar
controls the VCO frequency, serially
controlled from an IV1B88543 microprocessor with its associated I/O
interfaces and battery-backed RAM.
Underside of the rig, showing the cooling fins and location for the fan fitted
to high power versions
led oscillator to produce direct FM.
A crystal controlled 1750Hz toneburst is injected at this point as
required, the mic derived audio being
muted by a transistor switch while
the toneburst is being transmitted.
The modulated VCO signal is amplified and fed to a block iV157737 PA
module to generate the 25W power
level, a PIN diode switch and twin pisection low pass filter follow. A
uPD2834 synthesiser coupled with
In Use
Finding a suitable mounting
location in my car was very easy due
to the set's compact dimensions, it
would be possible in many instances
to place the set up at virtually eye
level to minimise the amount of
diversion of attention required to
operate the set whilst on the move.
The large frequency readout was
very handy in this respect, but when
viewed from below (if the set was
mounted above head height in a
commercial vehicle say) the display
becomes blank due to the viewing
angle, so lorry drivers beware! The
facia buttons, although small, had a
positive tactile feel and were hence
very easy to use by touch alone after
I had familiarised myself with their
positions.
I started programming up the 21
memories with 2m repeater and simplex channels, using call channels 1,
and 2 as S20 and the local 2m 'box'
for quick selection. By programming
band scanning limits into channels
20 and 21 — locking these out of
memory scan mode, I found I could
ANT ^
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D-
AT
LMTTER
TA7558
VCO
2SK125
IS2209
2SC2620X3
T R SWITCH
151588*2
arTER
2SC2407
CWVE
2SC2538
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4013
4030
4011
CONTRCH.
LOW PASS
SHIFT
SOL
REGISTER —C TONE
MN6W0
MPO4094
1st
PRE5CALER
•<P8571C
PLu
*iP02834C
KEY SWITCH
• CONVERTER
/PC 393
Transmitter
and Receiver
Receiver
Transmitter
SOL
•[ DETECTOR
SMETER J.;
• 1K60X2 <
TX RXCONTROL
4049
2SAM62
48
SMETER i rFM DETECTOR
AMP
ESC2519 ,
21 I4SMHZ
RAM t O
M68416
MeL82C43x2
>"
• J CRYSTAL
>'n 21FILTER
6MH2
VOLTAGE
REGULATON
2SA1015
VOLTAGE |
REGULATOnI
2SC2819 I
F
VfTEMSWTOi
-•
Mi 308
•■
ii
•
—1
r
TXRFICTDI
1st MXER ' RF AMP
DETECTON
2SK192 ! 3SK129
15597*2
POWER
M57737
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sou iI..
jt CONTROL
' 2SA1162 |
T
AT AMP i
2502619 J
—1
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n
tC8v
t
VOLTAGE
REGULATOR
2SC2877
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!
VOLTAGE
REGULATOR
2SC2877
r
Please mention HRT when replying to advertisements.
Fig. 1 Block diagram of the Alinco ALR-22E
HAM RAD'O TODAY DECEMBER 1987
Laboratory Results
Receiver
i Sensitivity; Input level required for
1 2dB SINAD
144MHz
0.161uVPD
145MHz
0.172uV PD
146MHz
0.174uV PD
Squelch Sensitivity
Threshold
Maximum
Maximum Audio Output; Measured at
1kHz on the onset of clipping
3ohm load
2.55W RMS
8ohm load
1.55W RMS
15ohm load
0.91 W RMS
0.147uV PD (10.5dB SINAD)
0.779uV PD (28dB SINAD)
Adjacent Channel Selectivity: Measured as increase in level of interfering
signal, modulated with 400Hz at 30%
system deviation, above 12dB SINAD
ref. level to cause 6dB degredation of
12dB SINAD on-channel signal
+ 12.5kHz
30.0dB
-12.5kHz
42.0dB
+25kHz
66.5dB
-25kHz
67.5dB
Blocking: Increase over 1 2dB SINAD
levels of signal 1MHz away to cause
6dB degredation in 12dB SINAD onchannel signal
+100kHz
83.0dB
-100kHz
84.0dB
+ 1MHz
102dB
- 1MHz
101dB
+ 10MHz
108dB
-10MHz
109dB
Image Rejection; (Increase in level of
signal at -43.2MHz to give identical
12dB SINAD signals: 76.5dB
S-Meter Linearity
SI
1.20uV PD
S3
1.36uV PD
S5
1.68uV PD
S7
2.16uV PD
S9
2.45uV PD
S9 +
2.98uV PD
S9+ + 3.75uV PD
Intermodulation Rejection: Increase in
level over 12dB SINAD level of two interfering signals giving identical 12dB
SINAD on-channel 3rd order intermodulation product
25/50kHz spacing
63.5dB
50/100kHz spacing
63.5dB
Transmitter
Tx Power and Current Consumption
Frequency
10.8V Supply
13.8V Supply
144MHz
21.8W/4.25A
27.4W/4.90A
145MHz
21.7W/4.15A
27.4W/4.80A
146MHz
21.2W/4.05A
27.3W/4.80A
Low power in all cases measured at 6.7W
Peak Deviation
Toneburst Deviation
4.97kHz
3.70kHz
Frequency Accuracy
merrily search over the top MHz section of FM activity whilst driving,
returning to memory mode for
normal operating.
At first I found it rather annoying that I could not initiate scan
mode by keeping one of the mic up/
down buttons pressed for a second
or two, but I soon realised that the
possibility of instant QSY from a
selected memory frequency by this
operation proved rathor more useful!
This saved me having to constantly
HAM RADIO ^ODAY DECEMBER 1987
- 6.2dB
- 5.1dB
— 3.3dB
- l.ldB
OdB ref
+ 1.7dB
+ 3.7dB
15.6V Supply
27.9W/3.95A
28.0W/3.90A
28.0W/3.85A
Harmonics/Spurii
2nd Harmonic
- 82dBc
3rd Harmonic
- 74dBc
4th Harmonic
- 83dBc
5th Harmonic
—88dBc
6th Harmonic
-88dBc
All other harmonics less than — 90dBc
— 300Hz at switch-on
switch between VFOs or repeater
shifts to get from one part of the
band to another, glancing at the display each time to see where I was
after each operation (sorry officer, I
was looking at my radio instead of
the pedestrian crossing).
There was ample receive audio,
even from the small speaker,
although this tended to be rather
toppy, and I never found I had to
place the volume control further than
its mid position. Audio reports re-
ceived on my transmissions were
generally favourable from amateurs
who didn't know my voice, those
who did found it rather 'nasal'
though, as if I were speaking with a
blocked up nose, accompanied with
rather more vehicle noise than normally occurs in the background of
my transmissions.
In use the set got fairly warm,
due to heat dissipation limitations
from its small size, but never reached
what I would call hot. It would be important to ensure a well-ventilated
mounting position, rather than positioning the set inside a glove
compartment or enclosed car radio
aperture.
When operating the set using a
repeater 80km away (GB3PI) at the
same as passing the site of another
in use {GB3PE), I found no receiver
desensitisation problems at all on the
Alinco. Likewise when tuning around
in a mobile rally car park, 20m from
the talk-in station, no reception problems were encountered, which also
left me suitably impressed.
Laboratory Results
The measured receiver sensitivity was quite reasonable, and the
good strong signal blocking performance verified the on-air results. In
other respects also, the receiver performed quite well, the only thing I
could find to complain about was the
limited S-meter range, which in fairness appears to be a failing on many
other FM-only sets.
The transmitter output power
was well regulated at just over the
25W mark, and the transmit deviation was accurately set at 5kHz.
The harmonics were well suppressed, and I could find no spurii
above -90dB.
Conclusions
This is a very neat and smart
looking set, coupled with quite a
reasonable technical performance
for its current price of £269. The
ample number of memory channels
could allow safer mobile operation
purely by use of the mic up/down
buttons, and its small size should
allow unobtrusive fitting into the car,
possibly even on top of the dashboard hence needing less eye travel
distance from the road ahead.
My thanks go to A. Kelly Communications for the loan of the
review equipment.
Please mention HRT when replying to advertisements.
49
METREWAVE
Printers and publishers view the approach of
Christmas with foreboding. They know that every
year it will tear several days, maybe even a week or
more, from their production schedules. Likewise,
contributors must turn in their offerings several
weeks earlier than they normally would do. In the
case of a yearly conspectus like this one, its writer
must hope that in a metrewave context no
In his customary look back over the
dying year Jack Hum, G5UM, reminds
us of some milestones (and a few
millstones!) which marked the passage
of 1987.
Significant Event or world shattering occurrence will
pop up in the last few weeks of 1987 to render his
material dated before it gets into print.
Certainly looking through a glass darkly over
those last few weeks ahead nothing appears on the
horizon remotely to compare with the two Significant
Events which hit 1987 earlier in its passage. One of
them was indeed a Big Bang; the other was rather
more subtle.
Big Bang
The Big Bang first: this was the release of two
new metrewave bands to the generality of British
hams. Throughout the early months of 1987 there
had been constant rumours that the BOMHz band
was to be opened to Class B operators. Well, after
all, it was a VHP band and Class B people are by
definition VHP types, so why shouldn't they have it?
Thus went the thinking, and it seemed to make a lot
of sense.
On June 1 they got it — and they got something
else, too, a veritable bonus far beyond their wildest
hopes; they got TOMPIz as well. Very few people
expected that this would happen. As readers will
recall from the piece printed here in September,
'Four' is a rather specialised band peculiar to the
British and hedged about with certain restrictions. To
be granted it in, as it were, the same breath as
50MHz was to many hams a sign that the Licensing
Authority was taking a much more liberal attitude to
the Amateur Service in the UK. It also showed how
important was the need to have a strong national
society able to talk with the Licensing Authority on
its own terms and to wrest substantial concessions
from it — like 'Six' and 'Four' for all.
Nature's Voice
Almost as if to celebrate this Big Bang, the
forces of Nature staged a 'spectacular' in the several
weeks following the granting of the band on June 1,
providing such phenomenal conditions of propagation
50
on 'Six' that it was possible to hear Stateside
stations on nothing more than a dipole in the
roofspace — and even to work them if you had the
patience to queue yourself in the pile-up.
Strangely, there had been another manifestation
of Nature sixteen months earlier, when Six was made
available to all Class A people: right on the opening
date of February 1st 1986, a gigantic aurora occurred
that would have produced Europe-wide contacts had
there been anyone there to talk to, which there
wasn't. Even so UK-wide contacts were enjoyed by
the Class A operators swarming on to the band in
February, 1986, convinced of the belief that If Six is
like this then I'm with it for keeps'. The Class B
chums who swarmed on to it on June 1, 1987, felt
the same; working Yanks was something quite
outside their experience.
Sadly, manifestations of Nature don't last long,
though be assured there will be more of them in the
coming years as the sunspot cycle improves. Soon, it
was borne in on many operators that Six was
beginning to conform with that definition of war: 80
per cent boredom, 10 per cent great excitement and
10 per cent sheer terror'. Presumably where Six was
concerned, the terror would be caused by failure to
work that Canadian after a three hour wait when all
about you were doing so!
Making the Choice
Here we have one of the Subtle Occurrences
hinted at above, and it is this: For most of the time
the 50MHz band functions as a VHF band, not a DX
one — and for most of the time it is sadly underpopulated. As one aficionado put it: 'There are lots of
1986
CLASS B
CLASS B
CLASS A
CLASS A
The bar chart shows how the dramatic drop in CB licences
in the UK has not resulted in the expected rise in Class B
ham licences, which have remained static over the period.
Class A licences marginally exceeded them in 1987 for the
first time in many years.
Please mention HRT when replying to advertisements.
HAM RADIO TODAY DECEMBER 1987
8 METREWAVE RESOLUTIONS FOR '88
1. I will make my contacts meaningful and cliche
free.
2. I will never hog a 2 metre repeater, remembering
a queue may be waiting to use it.
3. If I haven't got myself organised for 70cm I will
make this a top priority for 1988 to give me
time to enjoy more relaxed QSOs — and more
repeaters at my bleep finger.
4. If I haven't got myself organised for 6 metres or
4 metres I will attempt to have a go after I have
re-read the many HRT articles giving advice
about them.
5. When 'going QSY' I will do so on to one of the
less popular SU or S channels.
6. I will try to make myself proficient at the Morse
code to help me wrinkle out weak stations not
workable by any other mode. . .but
7. Having 'got the morse' I will keep in practice so
I don't lose it.
8. Heeding the remarks about the anti-social nature
of omni-aerials, I will either build or buy small
beams for the metrewave bands I used to give
me the same effect as buying a linear but at a
quarter of the cost.
licensed listeners who can't be bothered to press the
transmit switch'.
Probably for this reason many Class B people
have opted to major on Four rather than Six —
though everyone knows that there are two other
reasons for this, first, that quantities of redundant
PMR equipment are around, adaptable for Four by a
bit of tweaking, and secondly that a 4 metre aerial
fits more snugly into domestic environments than a
6 metre one.
Result: a great increase in FM activity on Four,
not solely by the newcome Class B friends but also
by many Class As, impressed by their example.
Indeed, on some evenings the congestion on
70.26MHz FM has been so exuberant as to persuade
operators to go out and get themselves a 70.45MHz
alternative next day.
Those 'snugly fitting' 4 metre aerials have
brought a new dimension to the band in more than
one sense. Most of these aerials are vertically
polarised, and of course the increasing number of
mobiles on Four use the same polarisation. In 1987
those diehards who had been on the band for a long
time they found they needed to supplement their
long established horizontal Yagis with an antenna
that would 'talk vertically'.
No mobiles on Six has meant that antennas on
the band are exclusively horizontal. They had to be,
anyway, by regulation. This has brought the concept
of 'horizontal FM' (a misnomer if ever there was one)
to 50MHz after its many years of success on the
144MHz band. Accepting the argument above that
there must be more occupancy of Six for more of
that time — and to use it as a VHF band and not as
a DX one — means that many more local nets need
to be established. Several were, in 1987, much to the
enjoyment of their participants. That bonus of an
extra megahertz which extended the width of Six to
two megahertz as from June 1 provides room for all
who wish to use the F3E mode. And already a
6 metre bandplan is under discussion to place DX in
the lower meg and 'local' broadly in the upper meg
— and, to the relief of many, no provision for repeaters!
Our Rate of Increase
Now to another of those Subtle Occurences that
became quietly evident during 1987, meaning the
slower rate of increase of British ham licences. This
phenomenon might be difficult to accept by readers
ready to point to the fact that there are now about
60,000 of us in these islands. Yet the writing was
clearly on the wall as early as April of 1987, when
the number of Class A licences extant exceeded
Class B, which had not happened for several years.
At that time there were 30,242 Class A and 27,166
Class B. Several sociological theories may be put to
account for this significant change in the pattern of
UK licensing. Here are two of them — and you may
decide that the second of them is not sociological
but economic:
The build-up of Class B licences over the last
several years was caused largely by the influx of CB
operators keen to extend their horizons. But the
number of CB licences, too, has been showing an
even more dramatic fall than Class B licences. From
1984 to 1986 the CB tally dropped by 50 per cent
from 280,000 to 140,000 in two years. Take a guess
and assume that 5 per cent of CB people go on to
become hams, and you can readily deduce that their
numbers have been halved. From 1986 to 1987 the
increase in Class B licences remained static at that
27,000+ figure. Not only were fewer CB people
coming in to the hobby, but lots of ham people were
letting their licences lapse.
No wonder there were rumours abroad in the
supply industry that sales of transceivers were
beginning to fall off. But that was not all; which
brings us to the economic aspect of the situation.
Sales of Japanese transceivers have been falling off
not just because the number of licences was, but
because they had become too expensive. Much was
made during 1987 about persuading more young
people to take up ham radio, a laudable thought but
somewhat out of this world when the prices of the
transceivers which the young wanted to purchase to
get on Two were quite unrealistic.
Many British licensees harbour the wish that the
Japanese transceiver industry would rethink its
design policy, cease introducing advance technology
for technology's sake, and come up with simple-tooperate 2 metre rings devoid of the bells and
whistles that simply serve to enhance selling prices.
Maybe 1988 will show that the industry has heeded
the economic warning bells which in 1987 sounded
with increasing strength, and will be persuaded to
market designs which are affordable by the many —
and the young.
What You Say and How You Say It
All those Citizens' Band operators and young
people keen to dip a tentative toe into amateur
radio's enticing pool may decide that this is not for
IZZIO
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
51
them after they have listened a while to some of the
nonsense they hear talked, noticeably on Two
(though it is said that they run on a bit on Eighty!)
But many times it has been remarked that
amateur QSOs are short on content but long on
wind. No wonder that intending newcomers find their
interest declining after they have listened a while to
the cliches of electronic conversation that dominate
all too many a QSO. Their enthusiasm may well be
rekindled when they are reminded that on the ham
bands you are allowed to talk about anything under
the sun that is at once relevant and decent and
which you would talk about in genial mixed company
(and in such company you would not be too
dogmatic in airing your views). There's much more to
ham radio communication than "The rig here is. .
or "See you further down the log."
'Short on content' no longer when you learn to
make your QSOs as near face-to-face as you can. It's
not difficult to achieve during simplex contacts: it's
dead easy in duplex ones, probably the most civilised
and rewarding mode of amateur communication there
is (so long as you observe the protocol of
announcing yourself frequently and not holding a
channel too long, lest this becomes vexatious to
others listening on it or wanting to use it). More real
conversation, then: a thought for 1988.
Duplex operation suggests voice communication.
But need it? You can do it almost as effectively on
the key in the A1A mode if you know how — but
that's a big subject to be aired here when there's
more time and space.
'Short in content. . .' Never let this observation
be attached to your callsign!
But there is another side to this picture, namely
those QSOs which offer no time to sit and chat and
exchange no more than signal strengths — all over in
about 15 seconds. Meteor scatter is an example. So
are the minimal QSOs you hear on Six when it is
open. In each of these cases the 'Everest Syndrome'
prevails — people attempt MS 'because it's there',
and the same with those minimal QSOs on Six when
it opens up for a while and pretends it is not a VHP
band. Both MS and VHP DX in all its forms add to
the sum of human knowledge about electronic
propagation because so many observers are active at
the relevant times, even though their communication
content remains virtually nil.
On To '88'
One of the more facetious ham radio
abbreviations is "88", meaning "Love and kisses".
Occasions for using it are rare. Yet you might think it
has some relevance to the coming year of '88 — and
although you would hardly expect it to be translated
literally it might apply if you vary it slightly to read
'Sweetness and Light'. The UK amateur movement
could do with a lot more of that in 1988!
hd
ATTENTION
ALL
WRITERS...
.. .or just readers who sometimes think
"I could write that!"
We're looking for authors to help us keep 'Ham Radio
Today' at the forefront of the radio scene. So if you've
designed some novel or cost-effective gear, you've done
something that is of interest to other amateurs, or you've
got a controversial axe to grind, we'd like you to contact
us!
If you're interested in writing for us, send us an
outline of any ideas you might have and tell us a little
about yourself. Write to: The Editor (submissions), Ham
Radio Today, ASP Ltd, 1 Golden Square, London W1R
SAB.
Please note that we cannot be held responsible for
the loss of unsolicited manuscripts. We advise all authors
to keep a copy of any articles they send us.
52
/rx
9
Please mention HRT when replying to advertisements. 73 G4NXV
V\
\
7
-C
HAM RADIO TODAY DECEMBER 1987
HOMEBREW
.
t-/
Right then, you've got your shiny HF
wonderbox, with matching trapped
HF vertical, but what happens now?
Has the magic gone out of DX chasing with too many lost stations? Your
thoughts may stray to putting up a
better aerial system, or maybe your
existing aerial's SWR rises towards
the band edges and your solid output
power dwindles to miserable
proportions as a result. In either case
you need an aerial tuning unit. But
have you seen the price of decent
imported ones lately? Here's a
project virtually anyone can get
going very easily, resulting in a useful
end product that will last them for
years to come.
Why use an ATU?
Basically, aerials may exhibit a
complex impedance comprised of
both resistive and reactive components. The ideal aerial would appear
as a 50 ohm resistive load, but this
is often not the case as the inductive
or capacitive component present
alters the overall impedance seen
and the resistive part is often
nowhere near 50 ohms. An ATU is
simply an impedance transformer, of
both magnitude and phase which
makes the impedance at the end of
the feeder look like 50 ohms, and
hence
nicely
matches
the
transmitter.
There are several ATU configurations, all of which have their merits
and demerits, some of the popular
types include the PI match, the
series-parallel circuit (SRC), and the
well publicised 'ultimate transmatch'; the configurations of these
are shown in Figs. 1, 2, and 3 respectively. These are all suitable for unbalanced loads, ie. an end-fed wire
or a coax-fed vertical or gamma-matched dipole. If you use a balanced
aerial fed with 200 or 300 ohm
open wire feeder, you will suffer
rather less feeder loss in most cases,
but a 4:1 balun(balanced-to-unbalan-
J
\A
A simple project, but one
that could make a great
difference to your
station's performance
on the HF bands.
ced transformer) is required at the
shack end. If your aerial requires an
ATU, rather than place the balun
between the feeder and ATU, hence
mismatching the balun, a more sensible approach could be to construct
a balanced ATU as shown in Fig. 4
Tx
AERIAL
/tJT?
Fig. 1 Pi match circuit.
LONG WIRE
CONNECTION
O
AERIAL
©
Tx
U/
Fig. 2 SPC circuit.
Tx
4:1
BALUN
h
OPEN WIRE
FEEDER
TO AERIAL
V-
Fig. 4 A balanced ATU.
and used that to tune the system to
resonance. In this case, the balun
would be presented with a 200 ohm
balanced impedance, transforming
nicely to 50 ohm to be fed to the
transmitter.
Added Bonuses
Apart from impedance matching, an ATU does have other advantages. As it normally acts as a highly
selective tuned circuit, it also functions as an RF filter passing only the
band of frequencies in use. Many
solid state receivers suffer from front
end overload caused by strong out of
band signals and as today's sets use
switched, broadband filters covering
several megahertz, the ATU makes
up for the lack of preselection, giving
a better receiving set-up.
The ATU will also act as a transmitter harmonic filter, which is very
important considering the current
official attitudes to amateur TVI and
the like, remember for instance that
the third harmonic of 10m falls right
in Broadcast Band II. Today's synthesised HF rigs also put out many
mixing products due to all the internally generated signals and again
one will often find wideband circuits
employed which nicely amplify all
this, even at the PA!
Components
If your interests are purely QRP,
then wide spaced variable capacitors
and large high-Q inductors are certainly not necessary. However if
you're building this project to keep in
use whatever your station capabilities become, then you'll need to find
something beefy! Surplus ex-military
gear is often a hiding place for nice
silver plated roller coaster variable
inductance coils, with sometimes
even the odd high power variable
capacitor or two thrown in.
The values of the components
you need depends on the impedance
of your antenna, which could be
]>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
53
The World's most beautiful ATU?
anything. In practice, I have found
that capacitors covering 10-20pF up
to 200pF or slightly over and an
inductor of 20 to 30uH makes it
possible to match almost anything
over the HF bands. You might be
lucky and get away with lOOpF, but
200pF will virtually guarantee a
sufficient range. Obviously, the
higher the maximum capacitance
and inductance, the lower the
frequency you can tune a really
awkward load. Very conveniently,
these values are just what you tend
to find in ex-military gear.
This gear is now getting fairly
rare and even when you can find it,
the asking price sometimes makes
one think twice before taking a risk.
No doubt with this in mind, more
than one UK manufacturer has decided to produce HF tuning components to fill the gap in the market,
hence components for homebrew
construction are certainly readily
available 'off the shelf. For this project, the Nevada TC500 dual
13-250pF and TC250 single
13-250pF capacitors and the Nevada
RC26 26uH roller coaster and
matching turns counter were used.
The 'ultimate transmatch' configuration was employed to give continuous coverage from 160m to 10m
at power levels certainly up to and
probably exceeding the UK limit of
400W PEP. The SPC configuration
could also be used, although in this
case I would recommend reduction
drives to be used on the capacitors
LONG WIRE
CONNECTION
o
AERIAL
7^
Tx
Fig. 3 'Ultimate transmatch' circuit, the one employed by the author.
54
Please mention HRT when replying to advertisements. 73 G4NXV
as the tuning of these is rather more
critical.
Construction
If you're wondering whether to
make an ATU yourself, I can assure
you that the majority of the work is
purely mechanical in nature. If you're
building your own enclosure, you'll
need the requisite sheet bending
tools, however there is a large selection of ready-made enclosures on the
market, from firms such as West
Hyde, Radiospares, Cirkit, and
Maplin.
I simply nipped down to my local
electronics shop and bought one
which fitted the bill nicely for just
over £10, but each amateur will have
their own preferences I'm sure. You'll
then need to drill out the required
holes, so a hand or electric drill is required, although a suitable size of
chassis punch will give a tidier finish.
For those who tend to ignore the
advice of 'measure twice, drill once',
a small round file can also come in
very useful. If you're using the
Nevada components, a smart purpose-made box is also available for
those who don't trust their skills or
can't stand the sight of blood!
Start by marking out the front
panel for drilling, either by using the
dimensions shown in Fig. 5 or from
those measured from your particular
tuning components if different. Drill
your pilot holes first, if you don't
have a chassis punch then you'll also
need to drill a circle of small diameter
HAM RADIO TODAY DECEMBER 1987
holes for the coil turns counter. Open
up the tuning capacitor spindle
80mm MIN
holes, either with a punch, reamer,
or round file, to allow for plenty of
mechanical and electrical clearance.
Now carefully remove the circlip
and washer on the turns counter,
and remove the dial with its spindle
and gear from the plastic skirt. Using
the skirt as a marker, drill four further
attachment holes in the required
positions, de-burr them and fix the
skirt using the screws supplied. Now
you can re-assemble the dial and cirA
clip, which nicely cover the fixing
screws to provide a neat finish.
BASE
THICKNESS
Using the roller coaster and capacitors in your desired mounting posiFig. 5 Drilling details of the front panel, using the Nevada components.
tions, mark out the positions of the
two fixing holes for each on the
bottom of the case and then drill
coax inner you now have spare may
In Use
holes to suit. Then do likewise with
be used for the 'hot' interconnecWith your system connected up
your coax sockets, earth and longtions, to provide good insulation
as shown in Fig.3, initially set both
wire screw connectors (if used) on
against the high RF voltages found
capacitors to their fully meshed posithe rear of the case.
in some mismatches.
tions. Radiate a small amount of
You can now begin assembly,
You will find that quarter-inch
power from your transmitter, ensurmake sure you mount the variable
spindle extensions may be required
ing you don't cause interference to
capacitors with their stator vanes
for the capacitors, and also an in-line
a QSO in progress, and tune the coil
(the non-rotating parts) uppermost,
coupler (preferably of the flexible
for a dip in the indicated SWR. Then
this keeps the stray capacitances to
type to prevent strain) between the
tune both capacitors in turn for
earth at a minimum. I would recomplastic roller coaster spindle and the
absolute minimum SWR, retuning
mend using flattened coax outer
turns counter. If you're using metal
both capacitors as required with posbraid as a good, low impedance
spindle extensions, make sure that
sibly a slight adjustment on the coil
earth connection between compothese are well insulated where they
if needed.
nents, but when using an aluminium
pass through the cabinet, and if you
You may find that there are
enclosure make sure you use solder
don't want a shocking experience
several capacitor positions giving a
tags for connections rather than tryuse non-conducting plastic tuning
good match, the one to go for is the
ing to bolt the copper braid to it
knobs! Remember this also applies
one with the capacitor vanes as fully
directly, as electrolytic corrosion
to the grub screws, and ensure any
meshed as possible. In use, you'll
could otherwise occur. The insulated
trim on the knobs is also insulated.
soon learn the approximate settings
for your favourite frequencies, and
you might find it handy to make a
note of the settings for each frequency and aerial combination to aid
quick tuneup.
This construction article has
only covered the 'bare bones' of the
ATU, the added possibilities are only
limited to what the individual requires. You may find an 'In/Straight
Through' switch useful to switch the
ATU in and out of circuit, you may
also like to include a built-in balun or
SWR meter, maybe even a multi-way
aerial switch. All these may of
course be fitted in the future as
«*
needs arise, so make sure you leave
enough space in the box and on the
front panel. Good luck and happy
tuning!
My thanks go to Nevada for the
provision of tuning components used
in this article, and to A/7iko Devereux
for his advice on tuning unit conInternals of the ATU
figurations.
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
55
Set in the foothills of the Odenwald,
midway between the industrial areas
of Darmstadt and the romantically
historic city of Heidelberg lies the
wine town of Weinheim.
The convention, which took
place on Saturday 19th and Sunday
20th September, is held in the
town's Multischule — a school that
teaches both primary and secondary
age children. It covers an area of
around 6.25 hectares — that's
roughly 250 x 250 yards to those
who only speak in feet and inches.
About 50% of the convention is
inside the main school and the remainder under the covered walkways that link the various buildings
in the complex. To gain entrance to
the inside costs DM5 (about £1.65)
and for this you can go in on both
days of the festival. If you only
intend visiting the outside stands
and the real ale and wurst tent, there
is no charge.
1
Weinheim is noted for the biggest VHF/UHF
Convention in Europe. It is also noted for its wine,
beer and wurst. Julie Darby, G1CKF, tries to
persuade us that she went for the former and not
the latter!
The Convention
This year over 6500 visitors paid
up to see the larger trade stands and
attend one of the four lecture
streams whilst another 2000 or so
wandered around the covered walkways which sheltered the flea
market traders from the hot Rheinland sun. The flea market stands
provided a valuable indication to
English visitors of the price of
secondhand radios; older style
Storno and boot mount Westminsters fetching the equivalent of
£125, and early post-war wirelesses
were marked up at between DM300
and 400. Bartering seems very popular in the flea market and if you're
prepared to wait until the second day
of the festival some useful bargains
can be obtained.
For the valve enthusiasts there
seemed to be an endless supply of
2C39a and similar bottles whilst the
56
more modern solid state scavengers
were treated to some rare bargains
in the 23cm PA block and transistor
field. Ail this in the flea market — I
couldn't wait to see what the main
building housed!
The Deutsches Bundespost
were in attendance with two very
well equipped vans. These were the
2C39a and other valves were readily available in the flea market
Please mention HRT when replying to advertisements. 73 C4NXV
HAM RADIO TODAY DECEMBER 1987
—■
MM
^
equivalent of our Radio Investigation
Service (R.I.S.) and provided a valuable source of information regarding
TVI and RFI problems. It seems that
sideband signals get into TV's on the
continent just as easily as they do
here!
One nice touch was the test
equipment — all of which was
British! — provided by the Bundespost so that the visiting amateurs
could have their radios 'spec
checked' for sensitivity, spurious
emissions and deviation. No tuning
was performed but the amateur was
provided with a print out of his rigs'
performance.
The licencing authority also had
a stand where a licenced radio amateur could obtain the necessary
documentation to obtain a full CEPT
amateur radio licence to operate in
member countries all over Europe. It
would be nice to see such a system
introduced here in the UK.
Variations On Antennas
Of the 95 trade stands at the
rally, some 10% were antenna manufacturers giving the customers a
wide choice of price, construction
techniques and more importantly,
quality, Jaybeam aerials were available on the UKW Technik stand (by
the way, UKW means VHP); the
aerials themselves looked remarkably similar to what you will see
dotted around the Leicester show
this year.
One entrepreneur displayed a
nice variation to the standard
gamma matching system used by
many manufacturers. The system
employed two pieces of aluminium
strip side by side, the spacing of
which was variable by a PVC adjustable screw. This produced an easily
variable capacitor to alter the feed
impedance of the antenna.
Tonna antennas had on display
their latest 2300MHz yagi. It has a
novel horn feed system with the elements spaced along the boom in a
similar manner to their existing
23cm antenna construction. This
antenna should be available in the
UK during the next couple of
months. Using 25 elements the
antenna has a reported gain of
..
••
Inside the Detutsches Bundespost RIS van
18.2dBi and an 'E' plane beam width
of ± 7.5 degrees to the 3dB points.
The boom length is 1.45 metres and
it only weighs one kilogramme! The
bandwidth of the aerial (below a
VSWR of 1.5:1.0) ranges from a little
below 2290MHz to about 2340MHz,
whilst still maintaining a claimed
gain of over IB.OdBi.
Homebrew
For the home constructor, there
were ample stands to choose from.
Werner Electronik had PA transistors
giving 5 watts at 4.0GHz (BLU 99),
Schottky diodes HP 5082-2900, N
channel GaAs MESFET (not MOSFET) devices useful up to 2.3GHz,
and some nice PA blocks for 23cm
giving 20 watts output for 0.3 watts
in. The only trouble being the prices
asked for one of these, over £90!
The same company also had
some interesting equipment for
23cm FM TV. The first unit was an
adaptor for the existing Icom 23cm
transceiver range. This allowed the
FM transceivers to be used for FM
TV transmissions and reception,
priced at DM550 it seemed quite
reasonable. The second item was a
tuneable 23cm FM TV transmitter
covering 1240 to 1290MHz (this
was variab'e for any 50MHz seg-
ment), with full digital readout and
an output of 1 watt. The companion
receiver tuned from 1248 to
1300MHz and was presented in a
similar attractive green case. Outputs were available for monitor,
speaker or TV. The transmitter cost
DM1298 and the companion receiver
DM1248.
The Bundesposts all-British test
equipment
R>
3>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
57
Weather satellite equipment was
very much on display. TGM of Pirmasens were offering converters
from 1691MHz to 135MHz for
around DM1095. Both Wrasse and
UKW Technik offered complete systems including 10 memory storage
facilities and sequenced display systems. These give results similar to
those used on TV AM and Breakfast
TV when the early morning weather
predictions are made by the
presenters.
One or two companies were
offering complete DBS TV systems
for home use. One was priced at
DM1200, very cheap, but I wonder
how reliable?
Components and accessories
were very popular at Weinheim with
the accent being placed on 'homebrew' equipment. Having already
stated that 10% of the traders were
aerial suppliers of one form or
another, it was pleasing to see that
16% of traders were supplying components for home construction.
They all appeared to be doing brisk
business. The quality of home constructed equipment on display was
very high, with many people demonstrating beautifully machined microwave linear amplifiers and well constructed transceivers for 10 and
24GHz.
Black Boxes
The mainstay of the amateur
trade, the infamous black box dealers
numbered around 16% with Icom,
For those intent on operating from the
The new Tonna 2300MHz horn-fed yagi
Kenwood and Sommerkamp all in
attendance. Some of the amateurs in
the UK may be surprised to note that
many of the new transceivers were
sold cheaper in Weinheim than their
English counterparts, whilst secondhand equipment held its price very
well and was often dearer than in the
UK. The only noticeable exception to
this rule were the 'add on' products
such as linear amplifiers which
appeared to be on average 20 to
30% dearer than the equivalent in
the UK.
Whilst on the subject of linear
amplifiers, it was interesting to see
BNOS on display and doing well. The
dealers from Essex reported a sucbath, water proof bags were on sale
«
58
Please mention HRT when replying to advertisements. 73 G4NXV
cessful rally and had on display a
new range of linear amplifiers for the
QRP range of transceivers. Capco
Electronics' ATUs were also available
through their German outlet. Nice to
see some British firms making an
effort!
Lectures and Demo's
During the two days of the rally
there were four streams of lectures
and demonstrations taking place.
Discussions and lectures included
aerial theory and practice, varying
from broadband and dual band
antennas to microwave feed systems, scrambling and de-scrambling
of satellite TV signals, mailboxes and
Packet networks, linear amplifiers
using valves and solid state devices,
and last but not least the ATV
demonstrations and lectures with
the emphasis on 24cm FM TV.
For those amateurs interested in
going to one of the German rallies
next year, it's well worth the effort.
Most cross Channel operators do
five day excursions and you can get
your car and self there and back for
about £70. If you add £40 for petrol
(from Dover) and £15 a night bed and
breakfast, it can be an enjoyable late
summer jaunt. Take a couple of
friends and share the motoring costs
and it could be a cheap, pleasant
break.
if you would like to attend West
Germany's VHF convention next
year, set aside the third weekend in
September and write to Lofyer
Kittwer in Der Krone 9, D6252
Heppenheim, West Germany for further details.
HAM RADIO TODAY DECEMBER 1987
[Mp®©
i
FOR SALE, Sommerkamp
SRG-8600DX communications receiver, plus HF converter, gives tuning range from
100kHz to 950MHz, as new,
£350. 2 Coronation Drive,
Great Cosby, Liverpool.
YAESU FT209RH with
speaker mic, two FBA-5
battery packs with nicads and
high capacity, FNB4 pack
case, charger/service manual
and other bits, £200. Datong
morse tutor, £30. Ring Mark,
0753 32373, leave tel. number if I'm not in. I.W.C.U.
FT790R 70cm multimode
with nicads, charger, manual,
carrying case, boxed, £250.
Burgess Hill 044-46-42122.
YAESU FT100 80-10 HF rig,
good condition and working
order, inc. new spare valves,
£250 or swap R600 or 2m
multimode. Tel. 0952 51670.
CONVERTERS, 2 metres to 10
metres microwave modules,
MMC144/28 as new condition, £20. 70cms to 10 metres
microwave modules, MMC
432/285, also good condition,
£20. Archer (Tandy) six element Discone aerial, covers
VHF, UHF, ideal for scanners
or converters, £12. Tel. Tarnworth (0827) 58004.
YAESU FT301 HF transceiver,
complete with power supply
and mic to match, £345 ono.
Belfast area, tel. 0232
654404
HOME/BASE portable CB/
trans, hand-built by professionals, not a production
model, nice job, built-in nicads
and charger, carrying strap,
DX, portable aerial, cost £198,
will swap for good modern
auto call, auto answer. Call Sid
anytime, 051 334 6859.
KW107 Supamatch, rare
British ATU, SWR and poweer
meter, lOOw and lOOOw, IkW
load, switching for various
ants, balanced and unbalanced outputs, in perfect
cond. A bargain, £65. Write
GODIH, 34 Warleigh Avenue,
Keyham, Plymouth, Devon,
PL1 1NW, price includes p&p.
FOR SALE, due to invalidity,
FDK 2700 VHF all mode two
metre rig plus transverters,
HG220 and HG280 in die-cast
box, plus home built regulated
Readers
Ads!
□
power supply for transverters HF receiver such as FRG-7 you've read the articles, try
with switching from rig, £300. R600 Sony 20001/7600D or the conversion, £125 ono. —
Phone Geoff 0603 715423 similar. My offer includes Tel. (0509) 268020 evenings,
anytime.
aerial PSU and some books. REGENCY
HX200C
VFO TF707DM, £85. FRG7
Call or write Mr M. Jackson, programmable hand held
receiver (digital display), £125.
6 Pilning Close, Peak Lane, Scanner, twenty channels
Mizuho MX2 2m SSB, handFareham , Hants. P014 3BW. AM/FM microprocesser conheld, £45. Ask for Rhys
TRIO model 7930 2 meter trolled, little used, scan hold,
(Clywd) 074571 2550.
mobile training transceiver 2,5 priority channel, LC display,
FDK725X 144-148MHz 2m
watts full scanning from mic AC/DC rechargable, including
mobile, plus Heatherlite safety
complete with manual mobile magbase aerial, charger
mic (a must nowadays!),
bracket, original packing, earpiece, case, belt clip £250
gutter mount with % x %
excellent working order, secures. Tel. Woodbridge
whips. Sell for £120 or conanytrial.
Tel.
G3MLP 03943 4208.
sider exchange for 10 metre
Peterborough 0733 63851 YAESU FT Newsletters, two
multimode plus linear (reason
anytime.
volumes 1984/85 packed
for sale). Phone 01-247 6097
YAESU FP700 20 amp power with mods, hints, fault finding
daytime only, thanks,
supply, built in speaker, mint tips etc. For all Yaesu rigs, £5.
FT707 or similar solid state HF
condition, boxed full instruc- G- Knox, 20 Pullan Avenue,
i-ig( QRO, 12V operated, wan- tions, £99. Hansen transistor Bradford BD2 3RT. Tel. 0274
ted for club use, plus ATI)
tester model ZQM2 absolute 630266.
3.5-30MHz. Tel. Stevenage
mint condition full instructions SUPER STAR 2200, converted
(0438) 724991 or 350136 or
boxed, £10. SEM Transmatch 10
meters
FM
SSB
352932, write G6EDA QTHR.
with easitune brand new, AM/CW/HML HH LL £300
ICOWI 271E 2 metre unused by SWL £99. Mike, Rotel 240 FM converted 10
multimode with Icom mains York 0904 422773.
meters, £90. ZX Spectrum
internal PSU. Also superb FOR SALE, Yeasu FT290R computer 48K boxed, £80
Mutek front end board dealer boxed. C/W Nicads, charger, BRL 200 Linear, never used
fined. Unmarked. Total cost carry case, strap, £250. Alinco £90. Ham International
new over £1,000, offers over
30w FM/SSB Linear boxed, Concorde recently overhauled
£725. Weltz SP15m + PEP mint, £30. Mobile whip, % can be converted, £90
mod £45. Weltz 38 HF ATU wave C/W gutter mount, Scarab system. Never used,
£50. Phone Chris on coax. £10. Ring Gloucester £50. Ferguson 3T31 cassette
Ironbridge 2711.
25989, Andy G4PZE.
recorder LED level, £45. Zoom
101ZD Yaesu Mk3 FM LAR TS430S with FM and narrow lens, £60. MrC. T. Curtis, 554
ATU Welz '200' power SWR filter modifications plus Middle Park Avenue, Eltham
bridge IK with PEP fitted. AT230 aerial tuner. PS43. London SE9 5QS.
Scarisbrick 880345.
Power supply SP430 external COMMODORE tractor printer,
FT101E £300 FT101B £220. speaker and MC60 Scanning will swap for BBC printer
MM4000KB RTTY receiver, desk mike. All as new. Boxed, perfect, GPZZIi % Antennae
£120. GW3COI Abersoch £950 for complete station. No boxed sell at £50. Sigma 4
2675.
time wasters please. Brian Antennae boxed, new, £60.
FOR SALE, Bearcat 20/20FB G4VSK
QTHR.
Phone Signal generator, £50. Scope
VHF/VHF Scanner AM/FM Wearside (091) 537 3966.
£50. Mini beam £40
model, mobile mount, manual
MICROWAVE
Modules RICOH500G 35mm , 2 cases,
whip and discone aerials
432/144R transverter 10W auto tele + converter, £40
included.
£125.
Tel output £90. Microwave cased. Wide angle £40.
0939-33638, Eric GOHRU
modules 144/100S Linear Contact Bob on 01 859 2649.
EDDYSTONE 770U receiver amplifier, 10 watts in 100 out Will contact Chasi has no
150 to 500 MHz in 5 bands with built in pre-amp, £100. phone RAIBC/RSGB disabled.
AM and FM, good working Tel. County Durham 3701429. Wheelchair bound. £60. — Mr
order and good condition for ALTRON 3 ELE 4 band mini C. T. Curtis, 554 Middle Park
year, £95 ono. Tel 0329
beam 6m 10m 15m 20m. £70 Avenue, Eltham, London SE9
46323, after 6 pm.
ono. Buyer collects. Phone 5QS.
SONY ICF7600D compact Peter, 0538 702208 G4YYO FT101Z HF transceiver, very
shortwave receiver 153KHz - QTHR.
little used, original packing,
30MHz FM 76 - 108MHz FOR SALE, Kenwood TS530S £400. Tel. 0272 624864.
AM/FM/SSB/CW 10memories
Pristine condition new valves, FOR SALE Sony 2001 super
with all manuals, accessories
absolutely perfect, also three portable scanning reciever,
all boxed as new, £80. Please element mini beam AQ6203E vgc, £100 ono. Bearcat 2009
ring Les, Castleford, West
10.15.20 and 6 meters by VHF VHF scanning receiver,
Yorks. Tel: 516904, after 2 pm
Altron
one year old, £695 can mint condition, £100 ono.
daily.
be seen working. — Phone Wanted Sony AIR 7 Icom
SWAP my signal R532 100 Brian 01-515 5517 anytime. R7000, Yaesu 9600, AOR
channel airband receiver for HAM International Jumbo, 2002. Tel 0283 68439
I
HAM RADIO TODAY DECEMBER 1987
|[>
Please mention HRT when replying to advertisements.
59
YAESU FT757GX transceiver AOR 2002, Sony AIR 7, Tel Ring me now and make me an
Telephone 0222 708336.
£625; FP757HD heavy duty 0283 68439.
offer contact Jon 0249 AOR 2002 scanning receiver
power supply £190; FC757 at HW8
Heathkit
QRP
VHF/UHF, little used, less than
automatic ATI) £290; Real- transceiver, good condition 712009.
EDDYSTONE 358 receiver for 12 mo nths old, including free
istic Pro-32 200 channell with PSU key phones manual
scanner with accessories £95. Hi-mound HK710 key sale, fully revalued covers 40 book, "VHF/UHF Guide"
£220; Miranda 35mm camera marble base £18. Buyers KCS to 31MHz £30. Buyerc £380, (save up to £100). N
with auto focus and exposure, collect or pay postage. G4IM1 ollects. Wanted circuit Lewis (G1VQK). Tel. (daytime)
diagram for Shibaden SV700 0386 556105, (night) 0386
motorised with flash, £45; (Birmingham) 021 422 4217
VTR
expences paid. 0502 554525 (ask for Neal).
computer soft/hardware for MULLARD high speed valve
RTTY TX/RX plus TU etc. tester complete with manuals 741283, after 6 pm.
EDDYSTONE 770R. £125;
Gordon Jackson 01-907 and almost a thousand test DRAE 2 metre pre-set ATU £6. Hammerlund HQ170, £125;
incl post include SAE. Bunney,
2253.
cards recently serviced offers 33 Cherville Street, Romsey, R208, £90; Microdot, £150,
MSI mobile stand and charger,
BARGAIN Siemens T100 around £85 or would like to
£25; SMC monitorscope, £70
teleprinter for sale, built to last exchange or part/exchange for Hants 5051 8FB.
comes with tape auto repeat W/S 22, 18, R206 R107, etc BBC (B) issue 7 computer, 40 or exchange for any 70cms
track
disc
drive
BBC
Teletext
and complete workshop KE Franklin 50 Abingdon
gear, H.D. rotator, H.F. linear or
manual. What offers? Vic Street, Burnham on Sea adapter RTTY/CW interface W.H.Y. McCallum, G4VNG,
and
software
book
etc,
£300.
Ashlee 01 300 7183.
0733 231639.
Somerset TA81PJ (0278) Wakefield 0924-825025.
TR4000 2 metre, m/mode,
70CM equip FT790R TCVR, 784205.
LOWE SRX30 digital read out c/w mic, m/bracket, £250. 2m
FL7010 10W Linear, both vgc, FOR SALE, Global AT1000 very accurate condition,
linear, MML100/S, £100. SEM
boxed with manuals case, Ariel tuner, £30. Perfect
excellent £100. Grundig
Nicads charger SMC mobile SXN200 Scanner, £200. 1400SL wide coverage in Transmatch, HF, ATU, £45.
MMA 28, 28MHz, preamp,
Antenna MET 17 - ELE Excellent condition. Buyer good
condition,
£60.
Antenna spare portable collects. Cash only. Tel. Leeds Skywood solid state perfect £5. SEM HF, auto, preamp, £5.
Yaesu mic desk type scanning
Antenna £320 ono. G1HZS 493094.
condition. Model CX203
Melton Mowbray 0664 FOR
SALE,
DR49 offers. A. Whitehead, 64 mode MD18B, £35. All items
64287.
Communications RX 150 - Planet House, Sunderland, good condition. Offers considered. Tel. 0293 783556.
FDK725X 1-30 watts 2 metre SOMHz good mid-range, RX T/Wear.
FM mobile rig, vgc, comes excellent condition, £120 ono. SX200N VHF/UHF scanning FOR sale, A.O.R. 2002 with
with Fleatherlite safety mike, Phone 0492 68 715.
receiver in very good condition HFCf shortwave converter
and gutter mount with % + FOR SALE, Realistic DX302 with mains adaptor. Unused Datong AD37, active antenna,
% whips ideal mobile set up. communications receiver,
serviced by Garex. Diamond D-130 Discone and
Sell for £200 ono or consider lOKHz SOMHz coverage, single
£165. Tel. Kings Lynn (0553) Revco PAS Masthead amp.
exchange NATO 2000, Cobra hardly used, mint condition, 763428.
Scans from 100kHz to
148 (10 metre) with cash boxed, £185 ono. Realistic FT102
in
immaculate 1300MHz Immaculate condiadjustment. Phone 01 247 PRO 30 scanner handheld condition, and just 3 years old, tion, boxed, four months old,
6097 daytime.
VHF VHF air band boxed £90 £500. No offers or time cost £734, will accept £45o'
SCANNER for sale. PRO-31 ono. R. Hodson, 99 Oxford wasters please. Arthur 061 Tel. 0325 487175, evenings.
VHF VHF hand portable Road, Garsington Oxford.
FTI Yaesu, all extras, CW, FM,
624 2808.
scanner, £140 ono. Ring David GRUNDIG signal generator
SSB, AM, filters, etc. Also
PYE
Westminster
W15FM
VHF
Newtownards 0247 810665. A52 AM/FM with internal 6 channel complete £35. Pye deluxe Telereader, model
REALISTIC PR031 Nicads wobulator manual and leads, PF8 VHF pocketfones, 1 pair CW685A with a large display
charger, VHF Scanner £110. offers, books on all radio
RTTY ASCII Baudot,
Sony air seven Nicads VHF subjects by Terman Henney complete with Nicads and screen,
CW, auto receive transmit,
manual,
£45.
Tel
0923
scanner £170. Icom 735 HF and other writers. Radio
beyboard, total cost £2000
general coverage TXR mic box amateur's handbook 39ED 241286 (evenings).
plus, will accept £1000 for
TRIO
TR9000
all
modes,
£700. Regret no PSD all item 1962 ivgc valves all kinds
vgc, swap both scanners for some boxed SAE for replys. mobile mount, handbooks, quick sale. Hariow 0279
22473.
original box, £275. MMS1
Grundig portable SW Satelite 0622 61327.
etc. Write 61 Crystal Palace TRIO TS700S plus external morse talker, £70. Both post TEN metre modification
paid please write G8BX0 John board,
29.300MHz
to
Park Road, SE26.
VFO plus spk one owner from
29.69MHz, £15. 4ATV test
FOR SALE, HX 2000E new, mint condition plus QTHR.
COMPLETE Yaesu HF system,
handheld, scanner, excellent manuals, FM/USB/LSB/AM 20 consisting of FT707 all mode card programs for ZX
Spectrum plus video buffer,
condition, very sensitive or watts
output,
£400
(including FM), HF transceiver, £5. Two new BASF video
swap with cash adjustment Nottingham 399556.
FC707, ATU, FV707DM, exfor standard 2 metre multi- SCANNING receiver, VHFVHF ternal VFO, FP707 power 2000 tapes, £10. Pye A200
mode in good condition. PR02001 with manual £120. suply, MMB2 mobile bracket, for 6m, 10 watts input, 60
watts output, £20. VHF/UHF
Phone Cork 021 371613.
Amateur band HF receiver,
£600 complete. May be in- frequency guide, £2. TeleFOR SALE, SX200N Scanner SSB+AM, KW202 £90. with
terested in all mode Urn
RX VHF VHF 26-514, £165. - manual
Trio
TS780 equipment with cash adjust- phone Paul on (0366)
A. Davies, 42 Everest Way, 2m-f70cm multimode base ment. Tel. 0274 (Bradford) 388615.
STANDARD C58 multimode
Hemel Hempstead, Herts HP2 transceiver, as new condition,
880895.
2m portable/mobile Nicads
4HX Tel Hemel Hempstead £725. Ken Greenough, 2 TRIO
2500 2 metre hand held,
216776.
Bexley Close, Glossop, 2 battery packs, leather case, charger, mobile mount, handSONY 2001 portable scanning Derbyshire SK13 9BG. Phone charger, service manual. Trio book, helical, boxed, slight
fault, £215. C78 70cms FM,
receiver, FM AM SSB vgc, 04574 5468.
3500, 70cms, hand held, 2 complete as above, gwo,
£100 ono. Realistic 2009 934 MHz fantastic bargain
battery packs, leather case, £150. Heathkit RA1 Rx with
VHF/VHF Scanner mint Reftec 934 with 2 x 18
speaker/mic,
manual, new spare valves, manual,
condition, £100 ono. Wanted element Yagis and phasing £16 each. service
Marconi 995 £45. G6TAH, 0761 53053
Yaesu 9600, Icom R7000, harness for only £199 ovno.
AM/FM signal generator, £55. (Avon). Buyer collects.
60
Please mention HRT when replying to advertisements. 73 G4NXV
HAM RADIO TODAY DECEMBER 1987
SONY ICF 7600D receiver
complete with PSU boxed sell
for £110 ono or part exchange
for Belcom LS102C 28-30MC
transceiver. Pete 01 393 9115
Epsom.
RECEIVER Trio 9R59D general
coverage .55-30MHz value
unit in good working order,
£90 ono. Eimac valves
4CX250 EG (two) brand new
with one ceramic value holder,
£30 for all three items. Ian,
0965/20033.
FOR SALE, transmatcher
Amtech 300 offers Nato 2000
£125. Suitable to convert to
lOKHz also Concord Mark 2
£100. Wanted Yaesu FT7B or
equivalent urgent or Belcom
26-30MHz also Trio R2000.
- 0283 221870.
TRIO R1000 receiver plus St
James Mk 2 ATU and Trio FIS5
headphones. All excellent
condition. £220. Plus carriage
or collect. Tel Shaw (0706)
841819 Lancashire Mr D. S.
Casey.
DRAGON. For sale 6 Dragon
32K main boards in full
working order but less both
the expensive MC6809EP
(IC15) and inexpensive SN74
LS783N both IC's plug in £5
each. Call Pete on Tel 0247
450702.
ARMY C12, AVO 8 MkV £50.
Manuals AR88D, CR100,
BC348, R209, R210, 22SET,
52SET, Eddystone 730/4 all at
£3 each inc p&p G352M
QTHR Tel. 0903 41810 after 8
pm and at weekends.
ZENITH speech processor
P202 mint £20. lOOw 12V
Linear GWO £20. 26-30MHz
Plessey type 72 3 bank 30
way 3 pole 7 in all to clear £30
all inc p&p write with phone
number to SP Martin 24
Collingwood Close, Worle
Western Super Mare, Avon
BS229PQ.
All
letters
answered urgently need ARA
30 active Antenna up to £100
for good example.
FOR SALE, Phillips D2999
world radio, MW, LW, FM, 150
KHz 2999 KHz digital clock,
batt mains manual, mint,
£100.
Heathkit active
Antenna, HD 1424, assembled and tested, by
Heathkit, manual, £30 or
£120 the two. 1 Kent Garden
Hetton-Le-Hole, Tyne & Wear
DH5 9LA.
FOR SALE, Icom 290D, all
mode, 25W, mobile transceiver,
complete
with
scanning microphone % whip
Antenna and gutter mount
with coax. All as new, hardly
used, £350. Telephone after 6
pm. 0732 882982 (Kent).
COMBINED Antenna tuner
power meter model No. 175
1.5 to 144 MHz. QRP rating,
20 watts, unused. £10. Mr
Goodbody, 11 Steeple Way, off
Church Street, Doddinghurst,
Essex.
APPLE JC AMTOR/RTTY
hardware and software including manual (just plugs into
your TV), £40. Apple disc
drive, £35. 80 Column card
with font disc and instructions
(boxed as new), £35. Apple
ioystick, £10. G4GPY Phone
0482 860440 evenings.
SHARP
stack
system
LW/MWA/HF, cost £160 (in
cabinet),
£60.
Colour
television Sony make rotary
tuning for DX TV, £60. Trio
TS-700G
transceiver,
multimode, base station,
£375. CB aerial 27/81, £7.
Mike, G1-XGM SIB, Brownhill
Road, Catford, London, SE6.
461-5398.
FOR SALE, Hallicrafters
SX62A in near mint condition
with spare parts, £135.
Wanted Eddystone and Raymart short wave components
circa 1930s tuning condensers coils valve holders chokes
etc. Phone 0272 629374.
FOR SALE, Welz AC 38m ATU
unused. Mint condition, £50.
Trio DM801 grid dip, £50. Plus
carriage. John 091 4162606.
STANDARD radio aircraft ATU
2-18MHz twin roller coasters
manual and motor operated,
£35. SWR bridge single metre,
£7. G3SZM QTHR. Tel 0903
41810, after 8pm and at
weekends.
YAESU FT225RD 2 metre
multimode base rig, vgc with
manual may take 290R +
cash or £350 ono. Tel: Luton
0582 417299.
24 VOLT Alcad battery unit,
enclosed in metal case with
built-in charger. Can be split
down to two 12 volt supplies.
Ideal for DX field operation
etc, £20, buyer collects. —
Contact Mike on (0704)
892088 location (Ormskirk)
Lancashire.
BOAT outfit, inland waters,
famaha 2HP O/B Tabur YAK II
dinghy. Moorland trailer, lighting board, life-jackets, oars.
Vlint condition, cost £790,
sell £350 or swap for AOR
2002 Scanner, must be mint. excellent Marconi Mercury',
Bolton (0204) 852786. Re- very good condition, Marconi
advertised DVE to time- 'Atalanta' superb KW77 (two)
wasters.
both very clean. Trio R820, as
FRG7700, memory, as new, new, Trio JR310, Trio 9R59DE
£275. Geloso 4'103 144MHz (two), as new, offers to Roger
transmitter, complete, £25. Cowling, Hill House, Dedham,
Ferguson VHS video recorder,
Essex. Callers welcome.
vgc, £95. Lowrey symphonic
FOR SALE FT2700RH
holiday organ, cost £3,250,
complete in original package
sell £850. Would P/ex any
manual etc, £350 ono.
item for old wireless, bright G3BKL. Ron after 6pm —
emitter valves, crystal set etc.
0980 862489 Salisbury area
- 0268 750895.
QTHR.
YAESU FRG-9600 for sale, TR9000 2 metre, M5mode,
£325. Yaesu FRG-7700, mic, manual, MTG/bracket,
£235. Both mint condition, perfect, £250. MML 100-S, 2
boxed, guaranty Eddystone metre. Linear, 100W, pre-amp,
770U Mk2 VHF 150-500 £100. SEM transmatch, 4F
MC/S AM-FM, good condition ATU, £45. 2 metre Antenna
with manual, £110. Gone power splitter, £15. SEM HF
Icom. Buyer to inspect and auto pre-amp. £10. MML28
collect. Wanted; mint Icom 28MHz pre-amp. RX only. £5.
R71E. Phone Huntingdon Offers considered. G4VJK.
(0480) 214428.
QTHR 0273-783556.
FOR SALE, Trio TS430S FM MICROWAVE
modules
unit AM filter 250c5s CW transverters MMT 144/28
filter narrow SSB filter PS430 £89. MMT 28/144, £95. MMT
power supply, £750. Hustler 432/144, £95. - 051-428
mobile Antenna with coils 1845.
80M 40M 20M 15M and 10M SINCLAIR ZX81 with 16K
£60. Carriage extra. R. Ram and programs inc. morse
Middleton, 49 Wolseley Road, locator logbook and orbits,
Stafford ST16 3XW.
Ferguson data recorder to
TRANSFORMERS, various match, % wave K40 10/11M
voltages from 2KV 100M mobile whip with boot and
400-0-400 500-400-375v mag mounts £70 or swap
6.3v-5v-2v 250MH and 70cms equip. John G1JDV
175MH also chokes, 12MH 091-4169674.
etc suite Linear. TV/modulator, TS430S fitted CW filter and
valve type, transmiting valves, FM board also TP430 PSU
QQV03/20As QQV03/10s £700. Phone Crawley 30658.
swop for anything interesting TRIO TR9000 complete boxed
radiowise, also 4 metre Pye £250. Morsetalker MMS1.
Cambridge, £10. Needs XTL's Hardly used, £65. Both
16 watt O/P. Tel Tony, G6-YPK carriage paid. G8BXO (John)
0952-48366.
QTHR.
KW2000B needs attention, TOWER EX WD, three 12ft
VF04B, PSU, some valves and sections, buyer collects, £100
manual, £100. Buyer collects. or near. CDE CD4S H/D Bed
GOAXZ. Tel. (Bardon Mill) 049 rotator, brand new, unused,
84 467.
£140. Drake MN75 all band
FOR SALE, HFS vertical HF ATU C/W Balun, Pristine
Antenna, £35. Lightweight condition, £115. G4GLL
rotator and controller, £35. QTHR. Tel; Bradford (0274)
SP250 PWR'SWR meter for 883969.
1.6-60MHz, £40. B/W video FOR SALE Ten-Tec 505 QRP
camera, £55. Spectrum T'cvr. £50. DX33 tri-bander,
128 + 2, £110. GM4YWQ mint condition, £160. —
0343 820955.
01-856 4123 evenings.
ICOM IC735 with PS55 TELFORD
tunable
IF,
matching power supply. Also microwave modules 144MHz
Amcomm 9000 ATU and converter, all modes, £45.
G5RU Antenna, only 3 Telford multimode 144MHz
months old. Absolutely transmitter,
25w
PEP
perfect condition, genuine synthesised, £50. Manual's.
reason for sale, £950. Phone Yaesu FT101EE, 1.8MHz
Mick Leatherhead 373241.
30MHz all modes, manul etc.
RECEIVERS
for
sale, £250. Pye Cambridge,
Eddystone EA12 very good S20-S23 R5 TX. £39. Q4JXK
condition, AR88D Racal RA1
Fareham 230737 Hampshire.
]t>
HAM RADIO TODAY DECEMBER 1987
Please mention HRT when replying to advertisements.
61
rP
$^ .<*
^o&^®<_
bpoa
Suy, se// or exchange your gear through
our free service to readers.
1. These advertisements are offered as a free
service to readers who are not engaged in buying
or selling the same equipment or services on a
commercial basis. Readers who are should
contact our advertising department who will be
pleased to help.
2. Advertisements will be inserted as and when
space becomes available.
3. The insertion of advertisements will be on a
first come, first served basis, subject to condition
2, As a result, it will not be possible to guarantee
the insertion of a particular advertisement into
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Please mention HRT when replying to advertisements. 73 G4NXV
HAM RADIO TODAY DECEMBER 1987
RETAIL
BIRMINGHAM
wm
R. WITHERS
CtS7
lw) COMMUNICATIONS
V
584 Hagley Road West
—_
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Send just £1.00 (refundable against purchase)
for latest catalogue + our exclusive products & used list.
BIRMINGHAM
REWARD'S HOME
STORES LTD.
(Est. 1963)
822/4 Kingstanding Rd., Birmingham B44 9RT.
Tel: 021-354 2083
G4RJM with 38 years in The Radio Trade
Ham Equipment urgently wanted!
Open; Mon-Sat 9-6
CHESHIRE
RING SUE CURTIS
ON 01 437 0626 FOR
DETAILS ON SERIES
DISCOUNTS IN HRT
DEVON
AGRIMOTORS
Merton CB & Radio Centre
Merton Garage & Post Office, Merton.
Nr. Oakhampton EX20 3DZ.
Open 6 days 9-6
(Sundays by appointment)
Specialists in 934MHz
Suppliersof all 27MHz and 934MHz equipment
KENT
|
ICOM (UK) LTD
ELECTRONICS
2 Stanley Road, Herne Bay, Kent
Tel: (0227) 369464
Open Mon-Sat 9-5.30pm
except Thursday 9-1pm
LANCASHIRE
AMATEUP ELECTRPNICS/HOLDINGS G3LLI.
YAESU. JAYBEAM. DRAE. DAT0NG. BLACK STAR COUNTERS.
ETC, FT 101 EXPERTS.
6JS6C 6KD6 12BY7A Original type approved
valves
& our ownKitsDouble
Balanced
Mixer
and'
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origina!
MK1-E.
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Full Yaesulorrange.
15PIT
mins01Junction
31 M6. Free parking. Call and.consult G3LLL
without obligation. Hotidays?TBhone, check
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L
.45 JOHNSTON STREET. BLACKBURN BB2 1EF.
A
(0254) 59595. CLOSED THURSDAY.
G3LLL
HAM RADIO TODAY DECEMBER 1987
NETWORK
LEICESTERSHIRE
ELLIOTT ELECTRONICS
for the Radio Enthusiast
26-28 BRAUNSTONE GATE,
LEICESTER.
ft
TEL: 553293
:■ i
Open: Mon-Sat 9.00am to 5.30pm
LONDON
ADVERTISE YOUR BUSINESS
IN OUR NEW LOOK "RETAIL
NETWORK" SECTION. RING
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MERSEYSIDE
ARE COMMUNICATIONS LTD
For Yaesu loom & Kenwood
Phone us for the best deals on all
amateur radio equipment.
38 Bridge St, Earlestown,
Newton-le-Willows, Merseyside.
Phone Peter G4KKN on 09252-29881
Opening hours Tuesday-Saturday 10am-5pm
NORFOLK
D.P. HOBBS (Norwich) Ltd
13 St. Benedicts Street, Norwich
Tel: 615786
S 'if] Open Mon-Sat 9-5.30
%
Ss1po" OMoMl
YAESU, FDK, ICOM, JAYBEAM
& Electronic Component Specialists
NOTT'HAMSHIRE
R.N.H. COMMUNICATIONS
44 HIGH STREET, STANTON HILL,
SUTTON-IN-ASHFIELD, NOTTS.
TEL: MANSFIELD (0623) 517204
Whole range of PMR. Mobile & Base Units,
Domestic & Cellular Telephones & Amateur radio
Products.
TRIO CLEARTONE PACE MARCONI
E3 Open 9.30am-5.30pm Mon-Sat
SURREY
GUILDFORD COr/MUNICATIONS
34 Aldershot Rd., Guildford
Open
Mon-Fri 8am-6.30Dm Secondhand wanted
Sat 8an>5.30pm
\2r/ & flUCOMi
■S'
ASDEN
0483-574434
SUSSEX
G.W.M. RADIO LTD
40/42 Portland Road, Worthing,
Sussex
Tel:0903 34897
Constantly changing stock of interesting items for
callers. Receivers, test equipment, components etc.
Rye pocketfone PFI TX units with battery and
circuits £12 inc. p&p. Meters survey radiac No.2
portable radiation detectors untested, no
information available £15 inc. p&p.
WEST SUSSEX
BREDHURST ELECTRONICS LTD
HIGH ST., HANDCROSS, Cu
WEST SUSSEX.
^ TEL: (0444) 400786
V
Situated at the Southern end of M23, Easy
access to M25 and South London. Open MonFri 9am-5pm except Wed 9am-12.30pm.
Sat 10am-4pm
MAILORDER gT]
RETAIL
TYNE & WEAR
LYWOFVD^ICS
For all amateur communications equipment and
accessories authorised dealers for
\4f7
and
traiicoM]
v
129 Chillingham Road, Heaton, Newcastle Upon
Tyne, NE6 5XL. Tel: 091 276 1002.
Open 10am-6pm Tues-Fri. 10am-5pm Sat.
Access & Visa accepted
YORKSHIRE
ALAN HOOKER
ELECTRONICS
42 Netherhall Road,
Doncaster
p'pllCQMI
Tel - 0302 25690
Large stocks of electronic
components.
N. WALES
NORTH WALES AMATEUR
RADIO MART
AMATEUR RADIO —CB RADIO —MARINE
RADIO — P.M.R.
25 ABBEY STREET
RHYL
Open Monday-Saturday: 11am-5.30pm
All repairs and accessories available ex
stock. Mail order welcome.
B
Tel: 0745-51579
■mSm
SCOTLAND
JAYCEE ELECTRONICS LTD
JOHN GM30PW
20 Woodside Way. Glenrothes,
Fife KY7 5DP
TEL: 0592 756962
Open: Tues-Sat 9-5
Quality secondhand equipment in stock. Full
range of TRIO goodies. Jaybeam- Microwave
Modules - LAR.
please mention HRT when replying to advertisements. 73G4NXV
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TOO.
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DEALERS contact us today
Co
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For the Deal You've been looking for
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aiu
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rt nG4
e f rWest
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FEBRUARY ISSUE
23rd NOVEMBER 1987
MARCH ISSUE
21st DECEMBER 1987
APRIL ISSUE
26th JANUARY 1988
£22 (+ £2 P&P)
TRANSMIT1
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MANPOWER
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GAIN
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Birmingham Bit 1EX
Tel 021-771-2645 (1755)
hrt for all
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MARKETS
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IAN FISHER Communications of
Stanhope. Main distributors for 27
MHz & 934 MHz CB radios &
S S0ries
0 en
?nS?
o
' Sun.
P 2.30-4.30.
Mem-Sat
l OSD-e.oopm.
CB
Works, The Market Shop Market
528464
Stanhop&
Tel
(0388)
EX GOVERNMENT SURPLUS
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at t
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TK» UK's
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' Nottingham
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RfidOnO
The
Genuine Government
SuJplui
Deafer
Always a large stock of Radio. Test
oervioe and General Equipment in
stock. Pye, Racal, Marconi. Tek Redifon
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Special; Eddystone 730/4 1-30Mh2 RX
£75 - £110. Pye PF2 LB FM from £25
Wessies alf types all from £15, Phone
Rob (G4ROB) For Details.
wa. _Order, Access/Visa Welcome
64
please mention HRT when replying to advertisements. 73G4NXV
HAM RADIO TODAY DECEMBER 1987
ACCESSORIES
NATIONWIDE DELIVERY
CB DEALERS contact us today
for Fast, Friendly Service, Competitive
Prices, Widest Range & Latest
Products
Tel: 061-445-8918
Pama House, 433 Wilmslow Road,
061-434-5701
Manchester M20 9AF.
OPEN EVERY DAY, SUNDAY BY APPOINTMENT Telex: 666762 PAMACO G
WHOLESALE
CB radios, aerials & accessories
delivered to your shop. Contact
for price list.
SOFTWARE
COURSES
STATE OF THE ART SPECTRUM SOFTWARE
G1FTU SSTV TX/RX
8.16, 24, 32, 48 and 96 second SSTV, Colour text and graphics transmit.
Brightness and contrast controls. Frame stores for saving and printing. 9
text memories.
Good RX performance on HF and VHF.
£12 on cassette, £14 on microdrive.
G1FTU RTTY TX/RX
The classic RTTY program, still going strong. Split screen, type ahead
operation. 45-110 baud amateur and commercial reception. Reverse
tones, unshift-on-space, tuning indicator etc., etc.
£10 on cassette, £12 on microdrive.
G1FTU CW TX/RX
The ultimate morse transceive program. Split screen, type ahead, software
filters. QSO review, print, re-send. Variable speed and tone.
INCLUDES BUILT-IN IAMBIC KEYER
This program has it all. £10 on cassette, £12 on microdrive.
Write or phone for full details. Return of post despatch of all orders. (Please
include your callslgn with order)
Pearsons Computing
42 Chesterfield Road, Barlborough, Chesterfield, Derbyshire,
S43 4TT England. Tel: Chesterfield (0246) 810652
VHF RECEIVERS
GAREX VHF PREAMPS
AND RECEIVERS
Simple versatile designs for spot
frequencies in the range 40-200MH2.
Preamps measure only 34x9x15mm. Up to
26dB gain:
6m. 4m, 2m & Weather Sat £11.45
Receiver is basically single channel xta!
controlled offering choice of IF
bandwidths. excellent sensitivity. 2 watt
audio o/p stage, fully assembled, tested
boards (xtals to order);
6m. 4m. 2m & W/Sat £49.95
Other versions and frequencies to order
Timestep Weather satellite Systems:
complete & ready to go. Microwave
VHF (NOAA)
AskMeteosat
for full &details
of thesesystems.
products.
Prices inc pip & VAT.
GAREX ELECTRONICS
Harrow House, Akeman St., Tring
HP23 6AA 044 282 8580 & 0296 668684
Ma// Order only Access/Visa
TO ADVERTISE
RING 01 437 0626
RADIO AMATEUR LICENCE
Start training now for the following courses. Send
for our brochure — without obligation orTeiephone
us on 06267 79398
Radio Amateur
Licence
City & Guilds
Exam 271
Microprocessor
Introduction to
Television
NAME
Radio & Telecommunications Correspondence School, HRT 12,
12, Moor View Drive, Teignmouth, Devon. TQ14 9UN.
FOR SALE
POWER SUPPLIES 138 volt,
7amp regulation 0.1%. Twin 3055
15amp regulators. Current limit
protection £39.00. Also entirely
new range of kits with short wave
receiver, active antenna etc. No
DDFA, Lower Road, harlech,
Gwynedd, LL46 2UB.
CIRCUIT DIAGRAMS
Any Make, Model, type, Audio,
Music Systems, Television, Video
Recorders, Amateur Radio, Test
Equipment, Vintage Wireless etc.
£3.00 plus LSAE. State
Make/Model/Type with order.
Full workshop Manual prices on
request with LSAE.
MAURITON (HRT),
8 CHERRY TREE ROAD,
CHINNOR, OXON OX9 4QY
ELECTRONIC MORSE
KEYER
#
Available with internal paddie
(TA2) or for use with external
paddle (TA6) 12v supply or 240v
P.S.U. available.
* Wide range speed control.
* Adjustable sidetone vol. & tone,
TA2 - with internal paddle£49.90
TA6 - requires external
paddle
£42.50
PU1 - A.C. mains P.S.U. £7.50
All prices fully inclusive.
NO EXTRAS
TARGA ELECTRONICS
9, Renishaw Road, Mastin Moor,
Chesterfield, Derbyshire S43 3DW
CLASSIFIED ADVERTISING
TERMS 8. CONDITIONS
Our terms for new advenisers (semi-d.splay
and lineage) are srrictlv pro-forma payments
until satisfactory reference can be taken up
(excluding recognised advertising agencies).
Cheques and P O.'s should be crossed and
made paYable to ARGUS SPECIALIST
PUBLICATIONS LTD and sent together with
the advertisement to
"The Classifiad Dept.,
No. 1 Golden Square.
London W1 R 3AB.
There are no reimbursements for cancellations. Advertisements arriving too late for
a particular issue will be inserted in the
following issue unless accompanied by
instructions to the contrary. It is the responsibility of the advertiser to ensure that the
first insertion of every series is published
correctly, and corrections must be notified in
time for the second insertion, otherwise the
publishers will not accept any liability or offer
any reduction in charges.
All advertising sales are subject to Government Regulations concerning VAT
Advertisers are responsible forcomolying wit>
the various legal requirements in force eg: Jhe
Trade Description Act. 5e*discrimination^ct&
the business advertisements (disclosure)
order 1977
Full Terms 4 Conditions of Advertising
availet/le on request.
Rates: Lineage 51 p per word (VAT inclusive) minimuin £7.59
semi-display £7.75 per single column cm. No reimbursements for
cancellations. All ads must be pre-paid.
HAM RADIO TODAY, CLASSIFIED ADVERTISEMENT
Name
DEPT, No 1 GOLDEN SQUARE, LONDON W1R SAB spa Address
PLEASE DEBIT MY ACCESS/BARCLAYCARD NO. DATEDaytime Tel. No:
Signature
Date
Q FOR SALE
P] SOFTWARE
Q WANTED
Q EQUIPMENT
Q AERIALS Q OTHERWISE STATE
I CLASSIFIED COUPON
MM RADIO TODAY DECEMBER 1987
please mention HRT when replying to advertisements. 73G4NXV
ADVERTISERS INDEX
KW Ten Tec..
13
Lee Electronics
9
Lowe Electronics
34,35
Microwave Modules
IBC
Poole Logic
15
RAS Nottingham
15
South Midland Communications... 6,7
SMJ Electronics
13
Spectrum Communications
15
Technical Software
Telecomms
Western Electronics
Ray Withers Communications
12
14
11
IFC
Allweld Engineering
ARE Communications
Argus Books
Arrow Electronics
BNOS
Bredhurst
CapCo
Cirkit Distribution
Datung Electronics
ERA Ltd
Icom UK Ltd
Farnborough Communications
Ham Gear Electronics
13
12
11
OBC
16
8
9
13
10
8
4,5
15
15
AM
9
9
/?/ '//.
TOP
-S>/
WISH YOU WERE
A
4?
*
O/
•••
BETTER INFORMED?
<x. 'x
%
GREAT
NEW
RATES
O.
^
s
'4.
%
%
%
(X.
fixep IT, war?
12 issues UK
£15.60
12 issues Europe
£20.10
12 issues Middle East
£20.30
12 issues Far East
£22.00
12 issues Rest of the World
£22.00
or USA
$30.00
Air Mail Rates Given on Request
Send this form with your remittance to:
INFONET LTD., 5 River Park Estate,
Berkhampstead, Herts. HP4 1HL
VISA
HAM RADIO TODAY DECEMBER 1987
50
MHZ TRANSVERTERS
MICROWAVE MODULES
50 MHZ
NOW WITH A CHOICE
OF 144 MHZ OR 28 MHZ
IP's
■
50 MHz mmmm
transverter
%
£289.80 inc VAT
FOR THE CONNOISSEUR WHO KNOWS WHAT HE'S BEEN WAITING FOR,
MICROWAVE MODULES ARE PLEASED TO ANNOUNCE THIS ADDITION TO THEIR
PRODUCT RANGE. BUILT ON A NEW EXTRUDED ALUMINIUM CHASSIS AND
RATED AT A FULL 20 WATTS OUTPUT THIS IS THE NEWEST ADDITION TO A
RANGE OF ALREADY SUPERB PRODUCTS. OUR 50MHZ MULTIMODE
TRANSVERTER OFFERS THE FOLLOWING FEATURES.
ALC RANGE 20dB
NOISE FIGURE BETTER THAN 3.8dB
FM SSB FSK AM CAPABILITY
SO 239 50 OHM INPUT & OUTPUT
CONNECTORS
20 WATTS OUTPUT POWER
144 OR 28 MHz INPUT I.F. RANGE
FULL 50-54 MHZ OUTPUT
150mW - 15 WATTS INPUT POWER
We know that our new product specifications are really impressive. Those customers who already own the 144/28R Transverter will
appreciate these comments. Those of you who don't and would like to own the best for 50MHz please phone the factory and ask for a spec
sheet. Club secretaries - we will be pleased to visit your club and give a presentation relating to our range of amateur products as well as a
demonstration of the METEOSAT weather system. Bookings are available for the latter part of '87. Please phone Mick on 0403-730767 for
details.
PRICE LIST
MML144/30-LS
MML144/50-S
MML144/100-S
MML144/100-HS
MML144/100-LS
MML144/200-S
MML432/30-L
MML432/50
MML432/100
2m 30W Linear, 1 or 3W input
2m SOW Linear, 10W input
2m 100W Linear. 10W input
2m 100W Linear, 25W input
2m 100W Linear, 1 or 3W input
2m 200W Linear, 3. 10. 25W input
70cm 30W Linear. 1 or 3W input
70cm SOW Linear, 10W input
70cm 100W Linear, 10W input
TRANSVERTERS
MMT144/28
2m Linear Transverter, 10W o/p
MMT144/28-R
2m Linear Transverter, 25W o/p
MMT432/28-S
70cm Linear Transverter
MMT1296/144-G 23cm Linear Transverter
MMX1268/144
1268MHz Transmit Up-Converter
MMT 220/28
220MHz Transverter 15/output
MMT 50/144
6m Linear Transverter 20W o/p
MICROPROCESSOR
MM2001
RTTY to TV Converter
MM4001-KB
RTTY Transceiver with keyboard
MMS1
The Morsetalker
MMS2
Advanced Morse Trainer
TOTAL POST
inc.
VAT RATE
98.90
B
106.95
B
149.96
C
159.85
C
169.97
c
369.84
D
169.05
c
149.50
c
334.65
D
139.84
289.80
195.50
258.75
195.50
139.84
289.80
188.83
299.00
129.95
168.82
MMC435/600
70cm ATV Converter, UHF output
MTV435
70cm ATV 20W Transmitter
CONVERTERS
MMC50/28
6m down to 10m Converter
M MCI 44/28
2m down to 10m Converter
MMC432/28-S
70cm down to 10m Converter
MMC432/144-S
70cm down to 2m Converter
MMK1296/144
23cm down to 2m Converter
MMK1691/137.5
1690MHz WX Satellite Converter
PRE AMPS
MMG144V
2m RF Switched GaAsFET Preamp
MMG1296
23cm GaAsFET Preamplifier
MMG1691
1690MHz GaAsFET Preamp
OTHER PRODUCTS
MMD1500P
1500MHz Divide by Ten Prescaler
MMR3/25
3dB 25 Watt Attenuator
MMR7/3
7 dB 3 Watt Attenuator
MMR15/10
15 dB 10 Watt Attenuator
Postage/Packing Charges:(inc VAT)
A = 2.35 C = 5.60
B = 4.91 D = 6.98
35.65
197.80
A
B
37.95
37.95
44.85
44.85
129.95
144.90
A
A
A
A
B
B
37.95
74.98
129.95
A
A
B
119.60
19.78
19.78
19.78
A
A
A
A
DURING THIS YEAR OUR TEAM WILL BE FOR MORE CLUB LECTURES. TO BE SURE
THAT WE DO NOT MISS YOURS PLEASE RING MICK, G4EFO, ON 0403 730 767.
VISA
WELCOME
MICROWAVE MODULES Ltd
BROOKFIELD DRIVE, AINTREE, LIVERPOOL L9 7AN, ENGLAND
Telephone: 051-523 4011. Telex. 628608 MICRO G
CALLERS ARE WELCOME, PLEASE TELEPHONE FIRST
HOURS:
MONDAY-FRIDAY
9-12.30, 1-5.00
E & O.E.
YOUR ONE SOURCE FOR RADIO
^
^
ELECTRONICS
M
LIMITED
j^KKWWV
Hatlield
Chelmsfdrd, Essex
THE NAME YOU CAN TRUST FOR PRICE & AFTER SALES SERVICE
YAESU SPECIALS!
FT767GX now
with NEW
synthesizer
modification
£1449.00
FOR IMMEDIATE DESPATCH
phone with your Access, Eurocard,
Mastercharge or Visa number to
0245 ICIwImslordl 381673 or 381626
Tolox 995801 lre< A5)
ICOM SUPER DEALS!
IC735 ICOM
Superb HF
transceiver with
General
Coverage
£839.001!
FT726R 2 Meter
base stations
£839.00!!
FT290R Mark II
25 Watt version
inc. Mobile
Mount £449.00
FT23R Yaesu's
fantastic 2 Metre
Handheld inc. FBA
9/10 £208.50
All above are cash prices.
Please telephone for
competitive Finance
quotations.
CASH PRICES??
This Advert, is prepared two
months
it. If
anybodybefore
elseyouis read
selling
cheaper — just give ARROW a
ring (any branch) for our
LATEST price!!!
■$S
BARGAIN
\VisjS,
KENWOODS!!
1
IC-R7000 ICOM
Scanner 25 MHz - 2 GHz
£849.001!
Full range of specialised
antennas for this model.
ICOM AH700 Discone
£82.00
Diamind D130N Discone .
£82.25
Active Antennas P.O.A.
IC28E ICOM
25 Watt 2 Metre
FM Mobile with
receive
modification
(138-174 MHz)
£319.00
^ ALL THE
K TOP BRANDS
AT
m
^ UNBEATABLE
W PRICES
TS530SP H.F. Transceiver 9 Band Mains
powered Complete at a staggering £749.00
(Limited offer while they last!!)
* v'
TS430S H.F. Mini transceiver with General
coverage/
Only £749.00!!
(Limited quantities only!!)
S8
TM221ES Kenwood NEW
MODEL 45 watts on 2
Metre FM Excellent
performance. £307.00
TH215 Kenwood NEW
MODEL 2M FM Handheld
with keypad entry.
Capability to receive to
160 MHz! £252.00
COMPLETE RANGES STOCKED OF ALL MAJOR BRANDS
COMET ANTENNAS
CA-1243E Base Ant. Dual Band
70cm + 23cm
£39.83
CA-2X4FX Fiberglass Base Ant. 2M +
70cm
£52.50
CA-2X4SUP Dual Band Base 2M + 70
Hi gain
£69.00
CA-2X4WX Dual Band Extra High
gain 2M + 70
£74.00
CA-2X42 2M + 70 Ultra Hi gain Fiberglass
Base Ant.
£91.90
CA412NN Diplexer 23cm/70
£31.74
CA-ABC21 2M 5/8 Mobile Ant. £24.50
CA-ABC22A Base Ant. 2M 2 * 5/8
Colinear
£36.00
CA-ABC23 Base Ant. 2M. 3 * 5/8
Colinear
£59.50
CA-ABC72 Base Antenna 70cms 2 * 5/8
Colinear
£33.00
AC-MS58 Magnetic Mount
£18.20
CA-SUS22 Stainless Steel Colin. 2M
2 * 5/8 Base
£52.50
SATELLITE TELEVISION
We are one of the U.K.'s most experienced
suppliers & installers. Systems from £459.00 to
£3000 or more. We can deliver & install
throughout UK or Continent. (Other countries
subject
specialMONTHLY
arrangement)
SPECIAL
EXPORT toPRICES.
DELIVERIESTO
E.E.C.
INTEREST FREE FINANCE
Many Major items are available with our FREE
CREDIT Scheme:
20% down Balance over 6 months
1/3rd down Balance over 9 months
50% down Balance over 12 months
Competitive Finance available with 10%
deposit/Part exchange as deposit balance
over up to four years. Written details on
request.
CA-2X4MINI Miniature Mobile Dual
Bander 2+70
£15.89
CA-CRD58M Book Mount S/S £14.79
CA-RS2 De-Luxe Gutter Mount £10.65
Full Comet range available, send SAE for
price list/Cat.
DAIWA RANGE
MR750E Multitorque Rotator £245.00
MR750PE ditto + preset cont. £278.00
MR300E High Speed VHF rotator £243.00
LMC Lower Mast Clamps
£18.00
MR750U Motor unit"
£75.00
MR300U Fast motor.unit
£75.00
KS065 Mast Bearing
£35.00
(Meters are Crossed needle type)
CN410M 3.5-1 SOMhz SWR/PWR £58.00
CN460M 140-450Mhz SWR/PWR £62.00
NS448 900-1300Mh2 SWR/PWR £86.00
MS660PA 1.8-150Mhz SWR/PEP + RMS
&
Averageing meter
£115.00
30/300/3 kW
U66VN 140-525Mhz (NS660P) £55.00
CNW727 Dual Band Aerial Tuner &
SWR/PWR Meter
£110.00
PS310M 30 Amp PSU Var. Volts £199.00
PS120XM 3.15v Var. 12 Amp. PSU £99.00
CL680 Antenna Tuner
£99.95
CS401 4 way Antenna Switch £59.50
CS201 2 way Antenna Switch £21.90
CS201G 2 Way Antenna "N"
Switch
£35.00
CS4 4 Way Ant. Sw. BNC
£30.00
BUTTERNUT (USA)
ANTENNAS
HF2V BOM + 40M Vertical
£139.95
HF6V 6 Band Vertical
£154.65
TBR160 Top Band Coil
£55.24
STR2 Radial Kit
£45.00
EXPORT?? WHY PAY FULL PRICE IN LONDON?
Special prices AND Tax-free for foreign visitors with free delivery to your
London Hotel by our Courier service. (Also Harwich/Felixstowe). Please
Telephone 0245 381673 (or 0836 294230 after hours)
Only
a few showrooms
in the
offer ALL MAJOR
as
FRANCHISED
DEALERS.
OurU.K.
maincanshowrooms
are onlyBRANDS
10 minutes
from the M25 Outer London Motorway (Take the A12 dual carriageway
—
just past
ChelmsforiS)
(British
HatfieldPeverel
Free car
parking.
Monday
to Saturday
9 —Rail5pm.
Closed alt day3 mins.)
Thursday.
SAGANT
SA450 2 way Antenna Switch
SO-239
£21.05
Super Rod 2 for 2M BNC
£12.95
Super Rod for FT290R
£12.95
Super Rod 7 70cms BNC
£12.95
BL40X HF Balun
£19.50
WELZ - DIAMOND
SP225 HF+6M+2M PWR/SWR Meter
PEP+Avg.
£99.95
SP425 2M + 70cm ditto
£119.95
SP620 HF + 6M+2M+70cm ditto £109.95
SP825 HF to 1200Mhz with Auto
SWR
£169.95
RS3050 30 Amp PS 3-15v
£159.00
CPS 10-80M vertical with radial kit£195.00
D130N Discone 26-1.3Ghz "N" socket
+ lead
£82.25
ADONIS
AM303G Desk Mic
£53.00
AM503G Super directional w.sp.
proc.
£69.00
FX8 Super directional mobile mic £69,00
ALINCO
ELH230D(II) 2M Linear 3 in 30 outw.
pre-amp
£89.95
ELH260D 1-5w in up to 60W out with
pre-amp
£109.00
KENPRO
KR250 VHF Rotator
£78.00
KR400 Meter cont +/- 180 deg. £139.00
KR400RC Round Meter 360 deg. £169.00
KR600RC 360 deg HD rot
£219.00
KP100 Electronic Keyer
£109.00
ALL MAIL ORDERSTO
CHELMSFORD
OFFICE
BY POST
Glasgow Showrooms
— 1st 339Floor
91
Dumbarton
Road, Partick-Tel:041
6445. All
week 9 5.
..
214969
^9en^ «irn ^Cook, «...
(Wigan), 0942
ul"'
ROTATOR SPECIAL
OFFER KENPRO
BARGAIN
KR500 Elevation
£136.00
KR5400 Combined Elv & Azimuth£249.00
KR5600 Azimuth
£332.00
CUT PRICE TONNAS
Complete range is over 125 antennas &
accessories. Price list + new Catalogue
(Send SAE please)
2 Metre Beams
"N" sockets
9 El. Yagi
£29.75
9 El. Crossed
£54.25
17 El. Yagi
£58.00
70cms Beams
"N" Sockets
9 El. Yagi
£27.00
19 El. Yagi
£32.00
19 El. Crossed — not "N'
Socket
£38.00
21 E1. Yagi
£42.00
21 El. (ATV)
£42.50
2M + 70cm
£38.00
Combi Yagi
27/28 Mhz
3 El. Beam
£90.00
934 Mhz Beam
13 Element "N"
£20.00
Splitters. Couplers. Multi-stacking
frames available to order.
Our normal despatch is one or two days
(as thousands of satisfied customers will
tell you). Subject to manufacturers
supplies being available. CARRIAGE
FREE on all orders of £300 value and over
(UK Mainland only) Access and
Barctaycard accepted. Save time-phone
over your order with your Access or
Barclaycard number.
Leicester Agent
Alan Faint (Market
Harborough)
0858 62827
North714657
Wales Agent John Lewis (Anglesey)
0248
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