Globe Electronics V -10 Variable frequency oscillator Technical Manual

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Form FR-028-L
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S ANGELES: 18,
Copyright 1961 Globe Electronics Printed in U.S. A.
Variable Frequency Oscillator
ICALIFORNIA PRS
TABLE OF CONTENTS
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FORWARD. . . : + + + # # + 00 + o + + + + + + + 0 a oo se 2
IL DESCRIPTION. ... +. +... зо с + » % = à aile va: vai vai de a 3
l. Introduction + www +++. "+ + + + + + +» 0 ver va es 3
2. Design . . . . .. ESE UNE SCS каз. 3
3. Equipment Complement . . . + + + + + + + + e e 4 2 9 4
4. Equipment Specifications. . . . + + + + + + + + 4 .. 4
IL INSTALLATION AND OPERATION . , e e » e e 5 5 4 5 5
1. Preliminary . e e » ++ + + 0 e e e e » * me e . .. 5
2. Pre-operational Check. . . . . . o eo. "s @ a am a-B
A. Descriptionof Controls . . . . + + + + + + + e e 5
В. External Connections . . . . « » e e + +. ++ me 9
3. Installation . . . « . « e e e » e + e e e e e e * e e e e 7
4, Operation. « « + + + + + +» #4 0 6 0 + + 6 5 + a ….. 8
IIT. MAINTENANCE . + + + + + + + + + + + + + + + + ze ‚зв 9
]. Forward & @& a id 4 8 5 5 8 & df Tf Wad % % % % % à 9
à. Alignment. . . « « « « « © CEE EN 7 ... Y
3. Service Aids
A. Parts Identification Top. . . . « « e +. + +» +... 12
В. Parts Identification Bottom . . . . . . . . . „mx 13
С. Dial Stringing Drawing . . . . . . . . o« oe ew 14
D. Parts List Schematic, Volume Chart. . . . . . 15
E. Service Stations and Distributors. . . . . . . Inside
Back Cover
Е. Warranty . . 2. 24 4 4 44424 44 24 Back Cover
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1. PURPOSE
The purpose of this manual is to
provide the owner and/or serviceman
with detailed information for the in-
stallation, operation and maintenance
of the equipment. It is suggested that
this manual be thoroughly read’ and
understood before any attempt is made
to place the equipment in operation.
2. PRODUCTION CHANGES
From time to time, electrical and/
or mechanical changes are made to fur-
ther improve the product. When a suf-
ficient number of changes have been in-
corporated to justify a model number
change, an А, В, or C, etc., is added
to the original model number, i.e., V-
10A. When and if such a change is made,
a modification kit will be made available
to enable the purchaser to update his
equipment.
3. MANUAL REVISION BULLETINS
As production changes are made,
manual revision bulletins are inserted
in the manuals and packed with the eq-
uipment. Authorized service stations are
also supplied with current bulletins as
they appear.
The manual revision bulletins con-
tain such information as type of change,
reason for change, circuits affected,
parts added and deleted, and a revised
schematic.
4. SERVICE ORGANIZATIONS
Located throughout the United States
are authorized service stations, which
are qualified to repair all equipment
manufactured by Globe Electronics. All
service stations are also authorized to
perform warranty repairs on all equip-
ment. Each service organization has
been carefully selected for their com-
petence, quality of service, necessary
test equipment and interest to service
our products.
Globe Electronics also maintains
an efficient service department within
the plant for those who wish to return
their equipment directly to the factory
for modifications or servicing. `
5. REPLACEMENT PARTS ORDERING
When ordering replacement parts .
from either the factory or authorized
service stations, always include the
Globe part number, description and
model number of the equipment, and
also the method of shipment desired.
Include the serial number of the equip-
ment if the part is to be a warranty re-
placement. Under no conditions will
Globe Electronics accept damaged or
defective goods for warranty exchange
unless proper authorization from our
customer service department has been
issued.
I. DESCRIPTION
1. INTRODUCTION
The V-10 consists basically of a
seven band, electrically, mechanically
and thermally stable variable frequency
oscillator to be used in conjunction with
CW, AM, or SSB transmitters. It pro-
vides a stable output for 160, 80, 40, 20,
15, 10, and 6 meters, covering all por-
tions of each band.
à. DESIGN
Considerable time and effort were
spent in the engineering of the V-10 to
accomplish the most favorable arrange-
ments of electrical, mechanical, and
thermal designs.
A modified Clapp oscillator was
chosen because of the series tuned arr-
angement of the frequency determining
circuits, in which case small changes
in input capacity of the tube will have
little or no effect on frequency. By us-
ing electron coupling, frequency varia-
tions, due to output loading, were min-
imized.
All frequency determining compon-
ents have been completely enclosed in
a separate compartment to isolate them
from drafts and sudden changes in tem-
perature. The remotely controlled band
switch was also enclosed in this com-
partment to provide short leads to the
components it controls.
A sturdy, two section variable cap-
acitor was used to provide maximum
band spread and stability on all bands.
Temperature compensation was
used liberally to reduce frequency drift
during and after warm-up.
A cathode follower stage proceed-
ing the oscillator, isolates the oscilla-
tor from the buffer amplifier, while .
the broadband buffer amplifier provides
amplification and also isolation from
the transmitter.
Voltage regulation is used in all
voltage sensitive circuits. The unit
contains its own power supply, thereby
enabling it to be used with all types of
equipment.
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An illuminated slide rule dial was
incorporated to facilitate tuning, Also
incorporated are colored illuminated
indicators to show at a glance which
band is currently in operation.
A separate SPOT-ON-OFF, spring
return, lever switch enables ZERO
BEATING with another station.
3. EQUIPMENT COMPLEMENT
The Globe Electronics V-10 VFO,
as supplied, consists of the basic VFO,
coaxial cable complete with RCA phono
plug and crystal socket plug, operating
manual and a two circuit phone plug.
4. EQUIPMENT SPECIFICATIONS
Frequency Coverage: 1.75 to 2.0
mc (160 & 80 meters), 7.0 to 7.425 mc
(40 & 10 meters), 7.0 to 7.175 mc (20
& 15 meters), 8.333 to 9.0 mc (6
meters),
Minimum Output Voltage (P. P. )
140V Е
Maximum Frequency Drift (after 20
minutes warm up period)
100cps
Power Consumption (watts)
15w a
Height 4 inches
Width 9-1/8 inches
Depth 9-1/2 inches
Weight 9 pounds
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II INSTALLATION AND OPERATION
1. PRELIMINARY
Carefully unpack and examine the
equipment for any damage. Should any
damage have occured, report it to the
carrier -- NOT TO GLOBE ELECT-
RONICS. The carrier will supply you
with the proper forms and instruct you
in on obtaining repairs or replacement.
If no damage is apparent, proceed with
the pre-operational check.
2. PRE-OPERATIONAL CHECK
Description of controls:
Bandswitch - Permits instant selection
of band of operation; 160 through 6
meters, The Bandswitch has four posi-
tions: 160-80 M, 40-10 M, 15-20 M,
and 6 meters. ,
Tuning - Tunes the VFO to the desired
frequency after the band has been sel-
ected. |
SPOT-ON-OFF - When this switch is in
the OFF position, AC power is removed
from the VFO. In the ON position, the
switch completes the primary circuit
of the power transformer and power is
applied-to the VFO. In the SPOT posit-
ion, the switch completes the cathode
circuit of the oscillator, thus permitt-
ing the operator to "zero beat! a re-
ceived signal without turning on the
transmitter,
External Connections
WARNING - Before making any external
connections to the VFO or between the
VFO and the transmitter, remove the
AC line cord plug from the AC outlet.
Also, place the lever switch on the VFO
in the OFF position and all transmitter
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switches in the OFF position.
Key Jack - Located on the rear apron
and used for keying of the VFO.
Output Jack - Located on the rear apron
and used for output cable connection to
the transmitter.
Power Cord - Located on the rear
apron and used to supply AC power to
the VFO.
AC Fuse - Located on the rear apron
and requires a 1.5 A., 250v fuse.
ee
The pre-operational check as out-
lined, must only be followed before the
equipment is placed into initial opera-
tion. Once they have been preformed,
they may be disregarded.
The V-10 is very well shielded, as
is a good receiver. In the following
checks it may be necessary to bring a
wire from the output jack and place it
near the antenna terminals of the re-
ceiver if a suitable strong signal can-
not be received.
A. Place the lever switch in the OFF
position.
В. Insert the power cord plug into an
AC outlet.
C. Place the lever switch in the ON
position, Allow a few minutes for
the equipment to warm up.
D. Place the band switch in the 160-80
meter position.
E. Set the VFO dial pointer to 3. 8mec.
F. Turn on the receiver BFO and set
the receiver to 3. 8 mec.
G. Place the lever switch in the SPOT
position.
H. Rock the tuning knob of the VFO so
the dial pointer moves across the
3. 8mc point on the dial. An audible
tone that varies in pitch, should be
heard in the receiver as the VFO
is tuned across the frequency to
which the receiver is tuned.
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Place the band switch in the 40-10
meter position.
Tune the receiver to 7.1 mc.
Place the lever switch in the SPOT
position and rock the tuning knob
so the pointer moves across the
7.1 mc point. An Audible tone
should be heard as in step "H",
Place the band switch in the 20-15
meter position.
Leave the receiver tuned to 7. 1 mc.
Proceed as in step КМ,
Place the band switch
meter position.
Tune the receiver to 8. 666 mc.
Place the lever switch in the SPOT
position and rock the tuning knob
across the 52 mc point. An audible
tone should be heard as in preced-
ing steps. If the receiver will not
tune 8. 666 mc, but will tune 52 mc.
check at this frequency with close
coupling between the VFO and
receiver.
in the 6
If all checks up to this point are
satisfactory, the VFO may be connect-
ed to the transmitter.
3. INSTALLATION
A. Insert the RCA phono plug (attach-
ed to the coaxial cable supplied)
into the OUTPUT jack on the rear
apron of the VFO.
B. Insert the other end into the cry-
stal socket on the transmitter
making certain that the grounded
pin in the plug mates with the
grounded pin in the crystal socket.
IMPORTANT
Approximately three feet of RG/
59U is supplied with the equipment. A
RCA type Phono connectoris assembled
on one end. This cable should be cut
to as short a length as possible, and a
suitable plug (a crystal socket plug is
supplied which will be used in most in-
stallations) assembled on the other end.
Only in extreme cases should the full
length of cable, as supplied, be used.
For optimum drive, each band
should be peaked, with the VFO conn-
ected to the transmitter, as follows:
Place the dial pointer in the center
of the scale. Select the band to be
peaked and adjust the proper output
coil for maximum drive as indicated on
the grid current meter on the trans-
mitter.
Note: L-5 160-80M, L-6, 40M,
20M, 15M, 10M, L-7-6M.
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The phone jack on the rear apron
provides for keying the VFO or
placing it in stand-by during non-
transmitperiods. The tip connect -
ion on the phone plug must be key-
ed to ground only, in order to op-
erate the VFO. This may be
accomplished with a telegraph key
for CW or a switch or relay on the
transmitter for push-to-talk AM
operation. (See figures A & B)
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4. OPERATIONS
Operation of -the V-10 is quite
simple once the proper connections to
the transmitter have been made.
Merely select the band you wish to use
and then select the frequency by zero
beating with another station or by us-
ing the dial calibrations.
The transmitter will have to be
retuned each time you change bands
and also when a large frequency change
within a band is made. This will de-
pend on the particular transmitter be-
ing used.
Phone Plug
К 7
| To KEY JACK
VFO
To 115V AC on Aux, Remote, Antenna Relay Control
Relay Cord
115V AC
Fig.
TO YFO | TO XMITTER
KEY JACK + KEY JACK
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KEYING | NEY
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SECTION III
MAINTENANCE
1. FORWARD
The design and manufactor of this
unit is such that it should require
little or no servicing. The following
section, however, contains information
to aid in rapid servicing, should the
need arise.
Should alignment become necess-
ary due to the replacementof a tube or
component, the following procedure
should be followed to produce the best
results.
NOTE: If only one band is in need
of calibration, it is unnecessary to
preform the alignment steps for the
other bands.
2. ALIGNMENT
A. Adjust trimmers C-4, C-7, C-10,
and C-13 to the "half open'' posit-
ionin such a manner that further
rotation of the shaft, in a clock-
wise direction, will decrease the
capacitance.
В. Adjust the slugs in coils L-1, L-2
L-3, and L-4 to the point where
they just start to enter the winding.
Adjust the main tuning capacitor
so that the plates are fully meshed.
If the tuning plates cannot be fully
closed or they rotate past the fully
closed position, the set screw
locking the gear on the capacitor
shaft will have to be loosened and
repositioned so the capacitor stops
in the proper position. Also, make
certain the dial pointer lines up
with the first calibration mark on
the dial scale when the plates are
fully closed.
Rotate the tuning knob clockwise
to the limit of its rotation. The
dial pointer should now line up
with the last calibration mark on
the scale. NOTE: The plates of
the tuning capacitor will not be
fully open since the stops limit
the rotation to 160°.
Place the cover on the oscillator
shield and fasten all screws.
Insert the power cord plug into a
115 V AC outlet and place the
lever switch in the ON position.
Allow approximately 15 to 20 min-
utes for the unit to completely
stabalize. Connect a closed key
or shorting plug in the KEY jack
while the unit is warming up.
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Place the unit on its side and ro-
tate the band switch to the 160-80
meter position.
Rotate the tuning knob to its max-
imum counter-clockwise position.
(1. 75/3. 5 mc)
Set the dial of a good communicat-
ions receiver of known accuracy,
to 3.5 mc. Turn on the receiver
BFO.
Adjust the slug of L-1 ina clock-
wise direction (core entering the
coil) until the VFO's signal is
heard in thereceiver. Continue
adjusting the slug until the signal
zero beats in the receiver,
Retune the receiver to 4. 0 mc. ,
Retune the VFO to 2.0/4.0 mec.
Adjust timmer C-4 for zero beat
in the receiver.
Repeat steps H, I, J, K, L, M as
many times as necessary, until
the 3.5 and 4.0 mc points on the
VFO correspond to the same
points on the receiver.
Place the VFO Band switch in the
40-10 meter position.
Tune the receiver and VFO to 7.0
mec.
Adjust the slug of coil L-2 for
zero beat in the receiver, by
turning itin a clockwise direction,
Tune the receiver and VFO to
7.425 mec,
Adjust trimmer C-7 for zero beat
in the receiver.
Repeat steps P through S (incl. )
as many times as necessary to
make the 7.0 and 7. 425 me points
on the VFO dial correspond to the
same points on the receiver dial.
Place the VFO band Switch in the _
20-15 meter position.
Tune the receiver to 7.0 mc -and
the VFO to 14.0 mc.
Adjust the slug in coil L-3 in a
clockwise direction until a zero
beat is heard in the receiver.
Tune the receiver to 7.125 mc and
the VFO to 14. 350 mc.
Adjust trimmer C-10 for zero beat.
Repeat U through Y (incl.) as
many times as is necessary to
make the 14.0 and 14.350 me
points on the VFO correspond to
the 7.0 and 7. 125 mc points on the
receiver,
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Place the VFO band switch in the
6 meter position. STE:
Tune the receiver to 8—333 mc
and the VFO to 50.0 mc. ,
Adjust the slug in coil L-4 in a
clockwise direction until a zero
beat is heard. ox
Tune the receiver to 9:-6 mc and
the VFO to 54.0 mc.
Adjust trimmer C-13 for zero
beat in the receiver.
Repeat steps BB through EE
(incl. ) as many times as is пес-
essary to make the 50 and 54 mc
points on the VFO dial correspond
to the 8. 333 and 9.0 mc points on
the receiver dial. |
This completes the oscillator
alignment. Output coils L-5, L-6
and L-7 should be adjusted for
maximum output after being conn-
ected to the stage to be driven.
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VOLTAGE CHART =
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VTVM MEASUREMENTS T-! “le lo PUT | PCR) PUB)
PIN NO. | 2 3 4 5 6 7 8 9
6BH8 41! dc 3i dc 185 dc O 6.3ac 5dc | -1Odc | О ас | 135 ас
6CB6 | -56dc | 2.4dc | 6.3 ac O 185 de | 185 ас o SR-1
ОА2 | 145 ас O O © |45 dc O О
20,000 Ohms/ Volt |
6BH8 | 6Odc | 36dc | 185 de O 6.3ac ,5dc О 10 дс | 135 дс /SW-SA
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NOTES еее -
I. ALL RESISTORS 1/2 WATT UNLESS OTHERWISE STATED. _ — 3<
2. ALL CAPACITOR VALUES ARE MMFD. EXCEPT THOSE STATED IN DECIMALS WHICH ARE MFD. ЗМ Y < al <> | A E
3. VOLTAGE MEASUREMENTS IN BOTH CHARTS MEASURED WITH LINE VOLTAGE II5VAC, LEVER Az
SWITCH
IN SPOT” POSITION, AND BANDSWITCH
IN
""60-80M" POSITION.
MODEL:
V-10
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