Hammarlund SP-600 JX general purpose communications receiver Instructions

GENERAL PURPOSE

COMMUNICATIONS RECEIVER

MODEL SP-600-JX

INSTRUCTIONS

ISSUE 2 - MARCH 1951

Manufactured by

THE HAMMARLUND MFG. CO. INC.

460 West 34th St.

New York 1, New York, U.S.A.

GENERAL PURPOSE

COMMUNICATIONS RECEIVER

MODEL SP-600-JX

INSTRUCTIONS

ISSUE 2 - MARCH 1951

Manufactured by

THE HAMMARLUND MFG. CO. INC.

460 West 34th St.

New York

1,

New York, U.S.A.

Printed in U. S.

1\.

FIG 1

FRONT VIEW

.

SP-600-JX

INOFC

RECEIVER

2

TABLE OF CONTENTS

Title

T1::chnical Summary

General Description

II Circuit Description

II [ Installation ...

IV

Operation and Description of Controls .........•.....

V Maintenance ....

VI Alignment ..

VII

Conversion of

Table Model Receiver for Rack Mounting .....

Table I-Tube Socket Voltages.

Table 2-Tube Socket Terminal Resistances.

Table

~-RF and HF Oscillator Alignmcm fro:quencics .........•...•...............

Table 4-Approx. Signal lnputs at IF and AF

St;I~CS

. • . • • . • . • . • • • • • . . • • • . . . • . . • . • .

Table 5-Parts List

ILLUSTRATIONS

Figure

Figure 2

Front View of Receiver SP·600·jX, in cabinet..

Block Diagram

Location of Tubes and Adjustments .

Figure

,

Figure

Audio and Overall Fidelity Curves .

Figure 5 Selectivity Curves

Figure 6 Rear Vicw of Receiver .

FIgure

7 Top View of Receiver .

FIgure 8

Figure

9

Top Vio:w of Receiver-eapaciror Shield Removed ...

BoHom View of Receiver SP·600-JX ...

Figure 10

BoHom View

of

Receiver-Tuning Unit Shield Removed.

Figure II Circuit Diagram of Receivcr.

.

FIgure 12

Connection Diagram-Recclver Chassis.

Figure I:; ConncctiOn Diagram-Tuning Unit .....

Figure 14

Connection Diagram-Frequency

Control

Unit.

3

9

12

16

10

II

13

II

17

Page

,

6

5

8

I'

14

15

20

21

2

7

23

24

25

27

29

JI

GENERAL PURPOSE COMMUNICATIONS RECEIVER

MODEL SP-600-JX

TECHNICAL SUMMARY

Electrical Characteristics

Frequency Range--cotal 6 bands .......•.........•....•....•....•....•....•....•.....

Band I ..........................••......•••••••...••....•......••.•.••.•.....

Band 2 .........................•............................. _.......•.......

Band .\ ....................•..............•....•....•....•....•....•....•.....

Band

-4 •.....•.•.........••..•.•.••.•..••.••••••••••••••••••••••.••...•.•..••.

Band 5...........................

.

.

Band 6 .............................................•....•...•..••...•....

Maximum UndistorlW Output-approximate-2.5

waUS.

.54 to 54.0 me

.,54 to

1.3.5

mc

1.3.5

to i,45 mc i.45

7,40 to 7.•0 mc to 14.8

mc

\ •.80 to 29.7 mc

29.70 to .504.0 me

Output Impedance-600 ohms-balanced split windmgs.

Phone jack-winding: delivcrs 1.5

milliwatts to iln 8000 ohm resistivc 10ild, when the iludio output to the

600 ohm power lood is adjusted to .500

milliwalt5.

Power Supply Requirements

Line Rating _ _. . . . . . . . . .

95, 105, 117, DO, 190, 210, 234 OInd 260 volt tilpS, 50-60 cyeln.

Power COIl5\lmpuon..................................

130 watts. 1.25 ilrnpt. ilt 117 vol1$-mill:irnum.

Tube Complement - total 20

RF, fF and BFO A.mplifiers .................•..... _

HF,

2nd ConversIOn and

BFO

O.scillillors

_

, ....•...••........

Crystal Controlled

HF

Oscillator ....................................•..•.•.. _.•......

.

Mi:ters ..............................................................•.... _ .

Detector,

"C" Bias

Rectifier and Noise Limiter

&

Meter Rectifier .......•....•............

AF Amplifier and

IF

Output ......................................•... , ...• , .

Power Oul put .........................................................•...........

Rectifier

Voltage Regulator

, ..............................•......

.

7 68A6

.' 6C.

1 -

6AC7

2 -

J -

68E6

6ALS

1 - 12AU7

1-6V6CT

1-5R4CY

1 OA2

Mechanical Specifications

Rack Modcl- Dimensions: 19 Ulchcs wide, 100 Inches high and 160 inches deep from rack mounting surface. Weight 66 lbs.

Table Modcl- DImensIOns: 21H Inches wide. 12.l.j inches high and 17}i inches deep.

Wei~ht 87'~ lbs.

Performance Data -

(approximate valurs·takt'h on a sample rect'iver)

SenSItivity is 2.3 miuO\'olu, or beuer, throughout the entire frequency n.nge. for oflOto1.

Image rejection ratios are better than 80 db throughout the frequency n.nge.

200,000 microvolts.

a

signal to nOIse power ratio

The IF rejection ratio at 600 kc is 1700 to 1

The

AVC

action will maintain the output constant within

12

db when the input is increased

from

2

to

4

GENERAL PURPOSE COMMUNICATIONS RECEIVER

GENERAL DESCRIPTION

The SP·600-]X is a 20 tube Radio Communications

Receiver with self contained power supply. The JX

suffix in this model number denotes that this receiver

is made in accordance with JAN specifications. with the exception of the use of a few capacitors and resis· tors where special design considerations require special values and tolerances nm included in the JAN preferred value lists or where space limitations do not permit their use. The special componclHs so used arc equal or su~riur to the JAN components in quality.

The receiver is supplied in either a well vcntil:l.tcd

steel, tanle model cabinet finished in dark grey to complement the lighter

~rcy front panel or for mounting in a standard 19 inch rclay rack.

The self contained power supply is designed for opcntion from a single phase. 50 to 60 cycle ahemating current power source.

The power transformer primary is provided with taps covering a line voltage range from 90 to 270 volts. The power consumption iF

no

watts.

The receiver is suitable for either headphone or louo speaker reception of AM radio telephone, CW tcle-

~raph or AM MCW telegraph signals.

The standard modd provides continuous coverage over a frequency range from 0.54

to

54.0 megacycles in sill: bands. The lar~e eHily operated band change control knob. on the front p.lncl, selects the desired frequency band and a band indicator visible through a small front p.lncl window indicates the frequency hand

1Il u~e.

This control also aligns the dial frequency indi..:ator with the pr()pcr dial scale.

In addition to the frcqucnc}' scal..:.s, the. main dial has an arbitrary

~::tle which in conjunction with the band spread dial provides continuous band sprcad scales Over each frequency band f{lr clI:tremely ::tccu' r:\tc logging and resctability.

The single tUlling control is large and of special design to permit ma:<immn traverse speed as well as e:<ccptional opcrating case.

It controls both the main and band spread dials.

An anti-backlash gear train provides extremely close calibration accuracy and completely accurate resctlbility. A tuning lock provides positi\·e locking action without affecting the frequency setting.

The tuning ratio from the tuning control to the main dial is 50 to I and the ratio from the band spread dial to the maiJl dial is 6 to 1.

to

An ingeniously designed rotary turret is employed change bands and to place the coil assemblies of the RF amplifier. Mixer :lnd First Heterodyne Oscil· lator stages directly adjacent to their respective 5ec' tions of the four gang tuning capacitor and their re' spccti"c tubes.

This assures mall:imum sensitivity at high signal to noise ratio.

Two stages of tuned radio frequenc}' amplification arc provided on all bands. The circuit for single conversion, uso.:d

011 frequencics up to

7.4 megacycles, includes a mixer, h.:terodync oscillator, fnur stages of

IF amplification, detector and AVC rectifier, noise limiter and meier rectifier. beat frequcncy oscillator, be;ll frequcn.:y buffer ;lmplifier. IF output, A.F amplifier and output powcr stage. The drcuit for double cOllversion. employed for frequencies abo\'!': 7.4 mega· cycles, include,; a second m;lI:cr and a second heterodyne crystal controlled oscillator. The power supply system includes a B powo'r rectifier, C bias rectifier and

,I voltage regulator_

The frequency control unit provides for fixed channel crystal controlled operation on any six frequencies chosen within the range of the ro.:ceivcr. Front panel comrols permit the sele.:tion of the normal hig:h stability continuously variahle lUning or either of the six selected fixed fretjuency signals. F(lr crystal controlled fixed channc1l)pcr:Hion it is only nl:ccssary to set the dial to the signal frequency, switch to the crystal frequency desired and tunc with the delt,1 frequency con' trol. Nl) retuning of the main tuning is necessary or desirable, when swit.ching (rom VFO to crystal opera· tion for the same signal frequency. These crystals arc not supplied with the rCCclvl:f, but shnuld be purchased on special order from HAMMARLUND

MFG. CO. specifying: the signal frequency for which

It is til (unction.

The two scale tuning meter 11I1rm.dly lIlclk,ltes the rdative strength of the r..:ccived signal in db from 1 microvolt, when operatcd on A VC ;\110 with the RF g;lin cOlltrol ;ll maximum. A re,lr .:ontrol is provided for adjl.1stmcnt at the plus 20 db scale reading with an

RF signal input of

10 mi.:rovolts.

011

depression of the panel meter switch the lower scale of the metcr indicates the audio output power level in db from 6 milli' watts.

A rear control is provided for adju.stlOent of the 0 db reading.

The AVC circuit is provided with s.:par:ltc time constants for CW and

Mew

(lperatioll. The beat frequency oscillator employs a hIgh cap,lClty Colpitts circuit which gives a high ordcr of frcquency stability and minimizes oscill:llOr harmonics.

The beat frequency oscillator vollage is introduced into lhe dctcctor through a buffer amplifier which eliminat.es

oscillator lock-in.

This feature mdkcs it possible to tune signals sharply to

:cro beat and permits the in-

5

dusion of the rear control for ;adjustine the beat ascii· lator lIlJecrion to suit opcr.umfZ" .:onditions. A front fUnd control varies the audio Ix.t frequency from 0 to plus or rnmU5

3 KC.

The nni~ limiter circuit effectively hmits the inter· ference from ic:nition systems or other .soUft:es of pulse type nOI~.

The hmitcr SWItch permits optional usc of the hmlter.

The antenna input cirCUli is duiJ,.:ned for

USl: wuh a halanccd Ime. Thc mput Impedancc IS nominally

100 ohms. The receiver may also

be

operated with

;a

COnventional

STOgie wire antcnn,l.

The audIO output circULt IS tle~IJ:JH:d for a 600 ohm load (lr Illle and is provided with a four terminal spilt wllldlrl~ for balanced load oper-ttiOIl.

Undlstoncd power output

IS approll:imatcly 2.5 W;lttl!. The head phone circuit whell referred to;'1I1 ROOO (111m load provides si~nals

;"tlcnuated apprOll:imatcly 15 dl:- helow the 600 ohm power output.

An RF f!ain conlrol is provided for the manual COil' trol of sensitlvity In the prescnce of strong signals and tlper-lles on either MANUAL or

Aye.

The scnd rc':CI\'O:: switch dl:5Cn~ltl:es the receiver but Ic,Ixcs the power on to provide for mstant recep' tlon

~twccn transmissIOn pcmx!s.. A re,lr re.:ept'Il.:le proVides for the connectiun uf an external rela)'

Radiation is negligible :lIld complies with requir~­ ments for .!lhlpboard OflCr:lIIOn and for multi·rccclwr insullations.

Frequency drift after a IS mlllute warm up pcmx).

ranges between .001 percent and .01 pcr..:enr of frequency depending on the frequency u$:d.

This IS a vcry unusual dCj.!fCe of frequency stability for \'an,lble tuned HF oscillators and dosd}' appro.1.chcs crystal

.!ltabllity.

The selectivity control pro\'ides three degrecs of crystal and three degrees of nOll'cryst:11 .selectivity

ranging from sh;'trp (.2kc) tl) broad (13.KC). The crystal tiltcr embodies the S,IIllC Circuit fealures that have provcd so effective OInd deSIrable ill Hammarlund

Super Pro Recei\'.::rs. incorporated in an improvcd mechanical design.

II

CIRCUIT DESCRIPTION

Gtntral- The circuit is shown schem;atie:tlly in

Figure

11.

A block diagram. Figure 2. is provided to more deilfly show [he arranflemen[ and functions of the various Circuit sections. The locatlon of the van' ous tubes is shown in Figure J. The circuit, for single conversion. used for sienal frequencies up

[0

7.4 me consists of two staJtes of RF amplification V·I and Y·2.

First MotU Y,S. First Heterodyne Oscillator Y-4. four stagCll of IF amplification Y'?, Y·9. Y·IO and Y-li,

Detector and

Aye

rectifier Y·H. Noise Limiter Y·15.

Beat Frequency Oscillator Y-n. IF output :md AF amplifier Y·16·A and Y-16-B. OutpUt Power st'age

Y'J? and the Power Supply system which includes B

Power Rectifier Y-19, e

Bias Rectifier Y·20 and Yoh· age Regulator V-JB.

Sign of the four gang, twm section. \'anable tunlllg capacitor and rug~ed construction throughout. pro'

Vide frequency stability and dial calibration accuracy to a previously unattained degree.

First Heterodyne Oscillator (Crystal Controllrd

V.j) _ For services requmng extremely stable. fixed frequency operation. a crystal controlled high fre· queney oscillator is proVided. Instant ch"n~eover from variable to crystal controlled oscillator. with a choice of silt crystal positions. is effected by a front panel con' trol. A .second front panel control permits adjustment of the crystal oscillator frequency over a plus

Of minus

.005 percent range.

In the circuit for double convcrsion. used fnr signal frequencies above 7.4 me. the Second Mixer Y'6 and

Second Heterodyne Oscillalor Y·S are substituted for the Gate tube Y-?

Input Coupling The antenna coupling is designed to provide optimum coupling from ;a 100 ohm trans' miMion Ime. A M.laneed doublet or straight wire an' tenna may

be

used.

Intermediale Frequency Amplifier Single cOllver' sion to 4S5 kc is employed for signal frequencies be' low 7.4 mc. There arc four stages of IF ampltfication incorporating the Hammarlund patented crystal filter circuit. Six positions of scl~etivlty prOVIde 6 db band· widths of 2•. 5, 1.3. :.. Sand 13 kc. On the thre.: narrower bandwidth positions, th.: cry9.,,1 filta IS

III

IIpcratlQl\ The .::rystal ph<lsmg .:ontrol prOVides ex treme SCIC':I1\·lty for tho? high :lttenualloo of dC1SClr

,tdJ.cent lllierfermg sign:lls.

RF Amplifiu An ingeniously designed rotary lurret is employed to change bands and to place the

COli as-~mblies of the RF amplifier Y·I and Y·l, Mixer

Y·5 and First Heterodyne Oscillator V·4 stages di· rectly adjacent to their respeetiv~

SC.:tl(1115 of the four gang tuning capacitor and their respective tubes. ThiS assures maximum sensitivity at high signal to noise ratio.

Firsf Heterodyne O.scil1ator_ (Variable V4)-

The rotary turret band change swilch, advanced de·

Double conversion is employed for signal fre.quen' des alXl\"c 7.4 me. The signal IS heterodyned to :;.955

me by the First Mixer V·S and Heterodyne Oscllla!Or

Y'4 or Y'3 for high Image rejection. The 395S me signal is then heterodyned to 455 ke by the Second

Mixer Y'6 and the 3.05 me Fixed Crystal Controlled

Oscillator Y·B, for selectivity.

Detector and AVC The Y,14 tube is used as a high levcl Detector and

Aye

RectIfier. The

Aye

cir· euit is provided with separate time constants for CW and

Mew

operation.

6

Beat Frequency Oscillator The beat frequency oscillalor employs a high capacity Colpitts circuit which gives a high order of frequency stabIlity and minimiz.es

oscillator harmonics.

The beat frequency Oscillator

Y-I

3.

is coupled into the detector circuit through Buf· fer Amplifier Y-12. which eliminates oscillator lock-in and permits vuiation of the beat oscillator injection by means of a eOlllrol [l1cated on the rear of the ch;lssis.

A frolll Panel control varies the audio beat frequency, from "era beat to plus or minus

3 kc.

Noise Limiter-The noise limiter circuit Y-15, limits the noisc interference from ignition systems or

Other sources of pulse type noise. A separate control

,,~

Clll'$TAl CONrllOllEO

Power Supply The power supply is an imegral part of the recei...'er.

It

includes the B recnfit'r Y'19 and the

C

rectifier Y-20, together with their respective low pass filters and the Yoltage Regulator Y·IS. The power transformer is provided with screw terminal primary taps, covering a power line source range of

90 to '270 volts, 50 to 60 cycles. The power transformer is protected by

a

fuse in the primary circuit.

Tuning

MelCr-

The tuning meter is used on AYC operation to indicate thc accuracy of tuning and the relative strength of received signals. DeprcS5ion of the

Meter Switch converts the meter circuit for indication of output level ill db from

6

milliwatts.

IF

outpur

''0 c REcr

"" a

",

RECT

5R4GY

'"

0"

,BLOCK DIAGRAM' f1G.2

switch S-6, permits optional use of the limiter on an)' mode of operation when pulse type interference is present.

Audio Frequency Amplifier A resistance coupled amplifier triode Y·16-B. amplifies thc audio frequency signal from the detector.

Audio OUfpul-The audio output tube Y·17. is transformer coupled through a split. balanccd wind:ng to deliver 2.5 watts undislOrted output to a 600 ohm load. The split balanced winding pcrmilS balancing of the direct currellt in the Output circuit, as used for teletype or similar service. A separate secondary wllld· ing provides attenuated audio signal output for headphone operation. This winding will deliver an output of 15 milliwatts inro an 8000 ohm resistive load when the 600 ohm power secondary is delivering 500 milli· watts to a 600 ohm resistive load.

IF Outpul- A cathode follower Y-16·A provides a low impedance source of intermediate frequency

(455 Kc) signal to the connector on the rear skirt of the chassis.

- - - Sl9nQI

II'lT~ e,,"'"wm ft> "" f"Q~ne;n

............ 5'9"'" pot!>

fGI'

frfll~1ICj

••

obG';. 7.4""

• •

b.'o...

7.4 me

RF Gain Control and Power Switch The RF gain control is provided for manual control of sensi· ti\.ity to prevent overloading on strong signals when opcratin2 with the AYC·MANUA.L switch in the

"MANUAL" position.

This comrol al.so operates when the switch is in the" AVC" position. The Power

··ON-OFF" switch is operated at the counter-clockwise extremity of the RF gain control.

Send·Receive S.....itch The send-receive switch dc· scnsitizes the receiver but leaves the power "on" to provide for instant reception between transmission periods. A rl!ceptacle is provided on the rear of the receiver for the extental connection of a relay.

Convenience Outlel A cOllvenience pOwcr outlet i1> provided on the rcar of the chassis for the connec' tion of an :lccessory such as a lamp or electric clock.

Radiation Advanced design and shielding of the high frequency, second conversion crystal and beat frequency oscillators 'has reduced radia'tioll to a negligible point so that interference of this nature, common in multi· receiver installations, is reduced to a minimum.

7

III

INSTALLATION

Tu~s and Packing-Inspect the chusis to see that all tubes are: firmly in their respective sockets ;md tha.t

any p;lcking is removed from the receIver.

Power Supply- Make sure that the primary tap lead on the power tri!.l1sforrner

is connected to the transformer tap which most nearly agrees with the 50 to 60 cycle power source voltage.

Anlenna The input impedance at the antenna terminals is designed to match

OJ.

100 ohm transmission hne. The angle plug adapter and connector. supplied

WIth the receiver, is designed for use with a small diameter,

"TWINAX"

tr.tnsmission Ime, which should

be

used with a bab.nced antenna Installation.

If it

is deSired to operate with a smgle wi~ antenna. the ;mleona

lud·in

wire should

be.

connected to one tcrminOlI of the connector plug and a ground lead should

be

connected from the other terminal of the connector plug to the ground terminal. whIch is adjacent to the

;l.ntenna input receptacle :u the reu of the tumng unit.

Speaker The loud spea kcr should

be

of the pt:rmanent magnet dynamic typt: and should include a speaker voice coil to 600 ohm linc matching traIl!former for connectiOn to the 600 ohm audio output terminals of the receiver.

Headphones Either low or hi~h impedance head· phones may

be

used in the phone jack. The high 1m· pedance type is recommended. The phone jack IS

10-

CilIOO at the lower left side of the front panel.

Mounting The receivcr may

be

plotced on a tahle or mounted

In a

~D.ndard

19 lOch nll'k.

If

a table model

IS purchased.

It is supplied WIth a steel cablllel The cabinet should

be

placed in a position which permlU the free access of air for the ventilation louvers.

IV

OPERATION

DESCRIPTION OF CONTROLS

The front panel dials and controls ue shown in

Figure I and the rear chassis skirt controls ilnd terminals are shown

10

FIgure 6.

Tuning Dials The milin diiil is to the left and the band spread dial is to the right. The main dial has six frequency band scales, calibrated in megat:yclcs and an arbItrary, outer scale. The band spread dial has an arbItrary. 0 to 100. scale The numernl under the fixed p,.,inter of the main dial indicates the number of revo' lutions thilt have been made by the band spread dial at any setting Thus. if the pointer, for the outer scale. of the main dial indicates over the figure 4 and the bitnd spread dIal indicates 87.6. the reading to lol,!

lor this setting IS read. 487.6. This precise mechanical hand spread system divides the rotation of the main dIal over each frequency band into approximately 600 band spread divisions. with one half division calibra.tlOn pomts. SlOce it is easy to estimate one tenth dIVislons. on the I»nd spread snle, thLS divides each frequency hand into itpproximately 6000 readilble settings. ThIS permits extreme i1ccuracy in the logging of stations.

Crystal Controlled HF Oscilla.tor for operntion on fil(eJ frequency chilnncls the "FREQUENCY

CONTROL" IS provided. The crystals are not supplied with the receiver, hut will be supplied on special order.

In order to insure correct crystal controlled frequency operation crystal units should be ordered from HAMMARLUND MFG. CO. INC. and the order should specify the signal frequency. for which each unit is to

be

used. The frequency control unit has provision for six crystals. Variable frequency opcration or crystal controlled frequcncy operation on any of the six crystOlI positions is sclected by the

"CRYSTAL SWITCH". The crystal OSCillator is desIgned for uSC! WIth suitOlble crystals at ;)Iny frequency

10 the rnnge of the receiver Olbo".:: one megacycle. The

"DELTA FREQ" control is uSC!d to compcns..lte for a very small plus or minus frequency tolerance of the crystals.

The procedure for crystal frequency control operation should be as follows: Loosen the knurled thumb screw on top of the crystal unit and push the retainer spring assembly to the reu. lnscn the crystal or cry' stals in the crystal sockets, numbered I to

6. Bring the l'Ctainer spring assembly fOl"\ollard so th;n the sprinc:s press on top of the cryst41 holders and tl.ghten the thumb screw. Mark the sign:lll frequency for which each crystal was selected. in megacycles on the plastic chart provided for this purposc alongSIde the crystal switch. PenCil or mk may

be

used and can be ernsed

If

It is desired to change these figures at any time. The numerals on the chart should be used !O that they agree with the numerals on the crystal socket positions.

which are also indicated by the crystal switch. The main tuning dIal should be set at the signal frequency for which oocration IS desired. The crystal switch should be set at the pOsition corresponding to the number for that si~nal frequency on the chart. The

Delta Frequency control should be adjusted for m:tximum si~nal or for 2.ero beat as required.

It

~hould be nOled that this luning adjustment of the Delta Frequency control must be made each time that the si~­ nal frequency is changed and that the main tuning dIal should be set to agree with the new signal frequency.

"

Tuning Lock The tumng lock, located to the right of the tumn~ knob, ptovidcs a posillVC locking for the tuning me.:hamsm without affecting the fre' quency settmg. when it IS clesLrt~d tl) prevent accidental shlflln~ of the tumO(:: or when the receiver

is

operated under:" severe condition of 'I.-ibration.

Tuning Meter- The tunmg metcr at the upper left on the front pand

15

useful m a..::curau:ly tunm~ a sljtnal and provides

;m mdic.ition of the relativc strength of the rccel'l.'ed signal in clb from

I microvolt.

The "METER

AD)

RF" ,:ontml at the rear of the chassis proVides adjustment of the plus 20 db readmR on the

Rf

scale, with a

10

microvolt input signal.

Dc,

pression of the "METER

SWITCH"

co",,'ercs the meur circuit for Illdlcatl0n of the

AF

output power

I~vcl in t1b from

6

mllhwaltS. This switch is spring returned to the

RF

scale cirCUlt pnsition when released and should 110t be depressed for Ihe

AF

scale ulIlcss the audio output has bC1'1i adjuslcd for

10", po",cr outpili, by means of hcadphones or speaker. Failure to observe this precaution may re<ult ill dama~e 10 the meter. The "METER AD)

AF"

control at the rear of the chassis proVides adjustment of the

0 db

reading (In the AF scale. which should be made when the AF out· put power from the 600 ohm ,lUdio output termllldls

IS

6 milliwatts or 1.9 voll.5 acrOM

:l

600 ohm load

Band Change -

Th~ large knob, to the left. is the band change 1.'0ntroi. Each revolution of thiS control turns the turret. contilimn,l:l the

RF

and HF oscil1uor

COIl, tnmmer and SWlt.:h cont<lct <tsscmbiic.s, from one frequency band to the neX[. The turret has no stops and m<lY

ble

turned

11\ either direction desired. A po.!Iitive detent machanism <lSsures correct location of the various bands.

The: band change control simultaneously operates the small frequency band dial, located at the center of the panel and aligns the dial frcquenC)f indIcator with the proper scale.

Selectivity Switch The selectivity switch provides three crystal and three non-crystal degrees of sclel.'tlvity. ranging from extremely sharp, for CW recep' tlOn.

LO broad for good fidelity MCW opc.r,luon. The control knob di;ll indicates the

6

db band width at each setting.

Phasing Control The phasing control permits hlllh attenuation of closely adjacent channel interference on either side of the signal frequency. when the crystal selectivity positions are used.

Beat Frequency Oscillator The: 1>£at frequency os..:lll,ltor is turned "on" for

CW

si~na.1

operuinn by tht: "MOD-CW" SWitch.

The heat frequency dial l>hould

be

set at z.ero for tunin~ to l.ero beat and then adJum:d to -,!,i"e the desired audio pitch. The heat frequency OSI:llIator inJection '·olu.gc is ;p.dJostablc hy the

"BFO IN)" control on the rt:;1r skirt of the chassis_

No~

Limiur The noise limiter switch i lOdepend..nt of other controls a.nd is useful

10 e:rca.t1y attl'nua.ung nolSC mterference from ignluon or similar pulse .ype sources. regardless of the mode of operation.

Send-Recdve The send· receive switch permits descnsitl:ing the receiver during transmission periods.

to prevent damage to the receiver. when operated in proximity to the lransmitter ;\nd provides instant re~ turn to reception between transmission periods

Relay Receptacle The relay receptacle. on the rear of the receiver. is connected in paralh::l wHh the l>cnd-rcceive switch ;\nd provides for the connl;ctiorr of an externally connected relay. to perform the scnd· receive operation. When the relay is used the send· receive switch is left in the "open" or "scnd" position.

A

VC-Manual Switch The AVC-Manual Switch pi'rmlts the chOice of either AVC or Manual sensillv-

Ity Oper.ttlOIi as desired. The AVe has a dcldy bias.

which insures maximum sensitivity for weak Signals.

RF Gain Control- The

RF

gain contrlll prOVides adjustment of the sensitivity for signals of various suength. when under the "manua'" opcratlllg condition. in ordi:T th.u the receiver scnsitivit)· may be ad-

Justed to SUit the Signal strength and prevent owrloadmg_ This control IS also in the cirCUli when Opeutllll:: on AVe.

III order that the senSitivity may be adJu5h:::d to reduce undCSll'<Ible nOISC dunng "off" periods

III the transmission of the received si~nal.

When it IS dc'

Sired to use the tunin~ meter fllr indication of rc!atn·c signal strength. the RF gain control should

be

at maxImum.

Audio Gain Control- The audio galll control ad-

JUSts the audiO input to the audio >tmpldier tube.

It

should be adjusted for the reqUIred audio output when operating on AVe and is nest left :n or ncar maximum whell operating

011

MANUAL contro!'

Phono Input Termmals arc provided on the rear of the n;cclver for phonograph or other audl() freo quency source IIlput to the audiO frequency a.mplifier.

Convenience OUllet -

A provided on the rear pow.::r outlet receptacle is

of

the receiver chassis for operatmg an accessory, !Uch as an dectne dock or lamp.

V

MAINTENANCE

This receiver

IS deSigned for continuous duty and should normally require httle attention beyond the replacement of tubes.

However, should trouble develop that c-a.nnot

be

eliminated with new tubes, the socket voltages and resistances should be measured to

.:hassis. Any ;\PPTf'l.'iable departure from the values shown in tables 1 and 2 will generally indicate the

L-omponent or circuit at fault.

Opcratinf[ and maintenance of the rccel'l.·er will

~reatly

be

facilitatecl if the contenlS of this instruction m;\nual are thoroughly dit;ested. Approximate lIlput signal values for stajZe hy !ta.$tc gain checks arc shown

III table 4.

9

TUBE SOCKET VOLTAGES-TABLE 1

Volu,gc to chusis. Ma.surements m.de with Westen Model 661 Volt-Ohmmwer. except those indIcated by

<Istcflo!k were milde with Mca.surcrncnu Corp. Model 62 VTVM. The 500 ..-olt scale "''as used for all "'oltagcs above 10 volts iilld the 10 volt scale (or voluges below 10 volts. Lme \'Oltagc 117, no signill mpu!.

Audlu G:am

,,:oolrol at minimum and C\V-MOD SWitch on

"CW"

TUBE

V·I

V·I

V.,

V·,

V.,

V·,

V.,

V.,

V·.

V·,

V.•

V·.

V.,

V••

V.,

V·,

V·,

V.,

V.,

V·,

V·,

V.,

V·IO

V·IO

V·II

V·II v·n v·n

V·13

V'14

V·iS

V-16

V'16

V-11

V-17

Y·18

Y-19

V-19

V-lO

V-20

I 2

,

•

,

SOCKET

PIN NUMBERS

•

,

..

,

,

'6.3..(

MODE OF OPERATION

'-I

·-5~

'-I

·-5-1

-

-

-

-

-6.3ac

·6.3:1.<:-

-

-

'00

'0

-

-

RF G:lIn max.

260

III

-

RFG~m min.

-

-6.1;0.,

-

210

100

-

RFCam mn.

·6.h.c

·6.33C

-

-

'60

1<0

-

-

RF Gain min.

-

0

-

265

-

Rt' G;o.m max.-VFO operatlon

t6.hc

-

ISO

-

2"

-

RF Gam mn.-Crystal fretl. Control

t6.h.c

-

-

0

0

290

-

RF O,lIn mm._VI'Q operation

-

-6.h.c

-

ISO

0 280

-

RF Gam mm.-Cr~·5tal Frcq. ContrQ[

130

-

-6.);&c

-

130

-

-

-

RF Gam mn. or mm.

l.l

t6.3ac

-

1<0 110

-

-

RF Gam max. or mm.

-

-

'-II

'-II

'-II

'-II

0

'-I

'-54

'-1

'-54

--II

-

-

-

-

-

-

-

-

'6.lac

-

225

90 '-I

-

RF G:un mn.

FrclI,.loixwc 7.4mc

'6 hc

-6hc

'6 lac

'6hc

'6.3at

'6 lac

'6.3:.c

-

-

225

170

'0

10'

-

-

'-1

-

'6.lae

-

205

'0

-

-

RF Glom mu.

_.

'6.3:.c

'6.3:.r

'6.3ae

'6.3:.c

'-II

'6lar

-

-

'6.lae

-

'0

-

-

-

-6.hc

ns

-

'-I

-

RF Gam mu.-Frc'ls. bc-Iow 1.4mc

-

-

'6.lac

-

'60

-

'-I

-

RF Glom m,n._Frc'l" b<low 7 4mc

"

-

-

-

-

-

-

-

-

'6.3loC

e6 hc

'6.hc

-

-

'60

"

,

-

-

-

-

RF Gaon mm.

Frrq$.lobovr 7.-4mc

-

-

RF Gam mu.-Frrq,. brlow 1 4mc

-

260

190

-

RF Glom mon.-frrqs.. b<low 1 4mc

-

215

0

-

-

-

RF Gam mu -Frtqf. abovc 7 ..4mc

-

260

0

-

RF Gloon mm.-Frrq5... bolle 7.4mc

-

0

-

-

-

FrrquenclCf below 7.4mc

freqUtnen:f lobovt 7.-4mt

-

260

235

-

-

Rf Glom mm.

-

105

'0

-

-

RF Gain mon.

-

260

235

-

-

RI'Cain min.

-

210

'<5

-

-

RF C;lln max.

-

240

1<5

-

RI' Cain min.

210 .0

-

-

RF C:l1n max

nro

h1ltetion max

-

140

'22

-

-

<5

-

-

-

-

-

RF Gam nun,-BfO Inll:CllOn max.

RF C.un mu. "r nun

RF Gloin max. or mm.

-

-

·6.hc

-

-

-

-

-

RF Glom lOU.

or m,n.

'0

52

-

-

-

I l

I '

260

-

-

HO

-

228

-

~

•••

'6.3lo(

RFCa,n mu.

'<0

-

RF Cain min.

-

'6 he 12

-

RF Glom mu

~

"0

-

-

280

-

2"

-

~

"0

-

'6.3u

13

-

-

-

-

-

RF Gam mm.

RF Gain ron or min.

-

'00

-

-

-

-

'00

-

RF Gain mu-'S Y

I (

Pon 2 to Pm II

no

-

-

-

-

520

~

RF Gam mm.-'S V loe Pin 2

[0

Pm 8

-

'-96

'6.lae

-

'-96

-

-

RFGlom mn.

-

'-97

'6.31oc

-

-

'-97

-

-

RFGalll min.

10

TUBE SOCKET TERMINAL RESISTANCE-TABLE

2

V·5

V·,

V.,

V.,

V·,

V·,

Resistance to chassis.

MC,l.Surcmcnts made wIth WestOll Modd 663 Volt-Ohmmeter, mum.

Tub.:. removed from socket under Illcasurcm..:m.

Audio Gain Control ,n maximum, RF Gain Control at mini"

Limiter

S\\!ltch "OfF". CW·MOD Switch on "CW", AVe·MAN

SWitch all ..

AVe",

Socket

Pin No.

Tub.::

Socket

,

,

8

,

MODE OF OPERATION

V.,

1.8M

0

0 -18K

SOK

0

<8K

V·l L.8M

0

0

80K 0

V·3

V·,

V·,

0

Inr.

'8K

Inf.

I

"f.

0 47K

0

0

0

In£' luI.

<16K

47K

<1K

0

0

'oK

Crystal Frc,,!_ ,<mtrol pu~.

,-,

Cr}'sl;Il frc",. control pus.

,-,

vre

Operatlon

<8K

47K nK nK

IISK

IISK

150

0

0

0

0

0

0

0

0

0

0

46K

-16K

<OK

46K

Inf.

51K

Info

70K

In!'

80K

22K

SOOK

,OOK

LOOK

0

0

0

!'rel.!.

Band~ below 7 -Ime

I'rcq. Bands above 7.4me

Preq. Bands above

7Ame

F.eq. Bands below

7.4mc

frcQ. Bands below

1.4me

Frel.l. Bands above 7.4me

V·1f

V.,

0 150K 22K 0

UM

0 0

52K 80K 0

80K 0

V·lO l.3M

0 0 52K

SOK

V·ll

V-12

12SK

0

0

0

0

0

48K

48K 145K

0

0

•

"0 to I K (BI'O InJcctlon c<.>l1trvl1

V·l:; 0

1'J5K

lOOK

0 770K 0 220K V·H

V·15

V-Ill

V.l7

V·18

V-19

V·1O

\I-IK

150K

0

118K

SDK

InL

500K

0

46K

6~K

'K

46K

0

"

0

0 16K

0

Inf.

0

46K

0

470K

78K

SOl(

0

"

0

46K

InC

220K

470K

0

680

360

"K

65K

VI

ALIGNMENT

The alignment of a mndcrn communications re' ceiver requires precision instruments ilnd a thorough kr)O\Vletl~c uf the circuits involved. This receiver, bemg

.1

douhle super-hcterooyne. the <llignmcl'lt procc' dure

is

even more involved than is usual.

UIH.kr normal service the receiver will stay in aliJ!I1' ment for extremely long periods of time. Cf'lIlscqucntly realiJ!nmcrH should not be attempted unless all other possible causes of a particular trouble h.\\'c been eliminated When

It has hCt:11 ddcrmincd that any rc,d(l!nmenl should be ,ltu:mptcd,

:1 g:rcat dc:d

(If caution

...hould be cl\crciscd in makin~ the adjustments. as an)' required readjustment should not entail mOre than a slight angu[M motion of lh..: aJjusting screw.

ALIGNMENT OF THE IF STAGES

The low frequency IF should be aligned first, The recommended method for aligning the low frequency

IF

involves the use of

11 sweep frequency si~nal generator and

;U\ oscilloscope. Since thcSi: instruments are not avaIlable at the average service station the alternate method using all amplitude modulated signal g.ma:\.lor and ;In output meter will be described first.

The additional information required for the visual dlignmcllt nlcthod

will be

cov..:recl in

a

later paragraph.

Th..: si~nal gencr.llor should

b..:

coupled to the grid of the mixer tube V5 thmugh a capacitance of ap' proximately .01 mfd.

A miniature tube adapter will be required to make the mixer grid connection avail·

.Ihle. Such an adapter is.mlll1\lfactured b}' the Akkn

Manufacturing

Co.

An output meter should be connected across the output terminals of the receiver or the speakl?r voice coil. The receiver controls should

IIOW be

Sd as follows:

COlilrol

Selectivity

Send

~

Recci\''':

CW~MoJ

Phasing

AVC~Man

AudIO Cain

RF

Gain

Hand Switch

Dial

Posilion

Sec text

Reccke

Mod

Arrow

Man

Set for approx. 20 volts

Sec text

1.35 3.45

me

2.5

me

The signal generator should be modulated

:iO

percent at 400 cycles. Turn the selectivity switch to the

3 kc Dosition :lnd advance the RF Cain control tll maxim'um. Sct the signal generator frequency to 455 kc and adjus.t Its output until some deflection is not;.:d on the Output meier. Refer to figure?> for the location of the various alignment adjustments.

Adjust L42.

1.4 [, L:i9, L?>8. L?>6 and L32 for maximum output. rc' ducing the signal generator output and the

RF

Gain contwl as required to prevent overload or excessive output. Now lurn the selectivity SWitch to the narrow' est position, .2 kc. and adjust the sign,ll KencTrI!Or frcquency for the maximum nutpuL This establishes the correct signal frequency by the 455 kc crystal for the

IF

amplifier and the frequcncy of the signal

~":llerator should not be disturhed for the rcm.tinUo:t of the low frequency

IF

alignment, unless it should be to recheck this establishment of crystal frequency to make sure th,lt the signal generlltor frequcn..:y h,ls not Jnftcd dllnng the alignment. The sekl:tivity switch is nnw lurned to the?> kc position and

L42, L41, U9. US.

L?>6 and

L:.2

:Ire ;Ig-al1l adJustct.l for maximum Output.

Now turn the selectivity switch to th..: I.:' kc pos:tit1n and :ldjust U7 for maximum output. llcJor..: ch:lng' ing this sct-up the

BFO

should

be

turned on by throw· mg the CW-Mod switch to

CW and checked for zero beat with the

BFa

knob dial at its :i:ero read mg.

If

necessary

LH

should be adjusted for :i:ero ompul. This check and adjustment of the

BFa

should be done WIth the signal generator carrier unmodulatcd.

The procedure for the visual method of aligning the

low

frequency

IF

should be the SJme

,u; the above

ex-

..:ept thJt the adjustments arc made for hoth m;u;imum

:Imphlud..: and coincidence of the oscilloscope images.

The oscilloscope vcrtic,d input should be I:onllcctcd across the dIOde detector load resistance, from the junction of R64 <tnd

R65

to ch~lssis.

The high frequency

IF

should be aligned next. Set the band switl:h

[0 th..:

7.4~ 1~.8

mc b<tnd. The sc'

I.:::CtJvit}, switch should be in the:' kc position. Adju.st

Ihe si!!nal generator frequency to ;'.955

mc ami adjust

Ul, U:'

;1l1d

U4

ffIT maximum output.

The ?> .

.i

mc I:rystal used

III thlt s<;:cond ':(lllv.. rSIIHl oscillator circuit is held to :\ wry dose frt.:qucilcy tolerance :lIld may be used

<I.!' a frcqucney s[;:Uldard at multiplc-s of :1.5 me from 10.5

Ttl..: upwards.

III orda to do this. in \,iew of the .::umplete shlc1t.ling ag<tinst r,ldia.tioll from this os.6I1ator, it

will

be necessary

!(\ t..:.mpor:trily connect a two foot length of Insul;Hed wire to the antenna terminal and dress the fre..: end of chis le:td around the tulle shield

Oil th..:

.~

.

.s

m\'

CJscill,lwr tube V8. This t..:St kad should, of ..:our:...:.

he rcmov..:d exr..:pt

\vhd~' in us,'

,IS a fn:yu'·l1q·

.;t.lndard.

ALIGNMENT OF THE RF AMPLIFIER

& HF OSCILLATOR

To ;uJcquately align the RF Amplifier and HF OscIllator an accur.ttdy calibrated slj.:nal generator lind an output meter arc required.

The frequencies n:qui red arc shown in table :'t. The location

1)(

the ad-

Justments is showil in Figure ). The use of Table

~ and Figure:; should be made in following this put uf the alignment which

will

llOW be described for une ircquenc)' band. The s.1mc

procedure should then be followed for the other frequency bands.

To align the .54-1.35 me band the sign.d generator is coupled to the antenna input terminal through a

100 ohm carbon resistor.

The gcncr;llor should be modulated :;0 percent at 400 cycles and the outp\ll meter cnnnected across the receiver

Output terminals.

The nX:l.'i\'cr controls should be set as follows;

Control

Selectivity

S~nd·Reccive

CW-Mod

AVC-Man

Audio Gain

RF Gain

Band Switch

Limiter

Set the re..:.:iva and signal generator dIals to .56 m.::.

The RF Gam control should be set at maxmmrl"\ and

Ih;: AVe Man .o;wHch sct

Oll

A

ve.

The

HF Os,:. L

adjustmcm shown in Figure :;, should now

t-l:

set for maximum output. Then the Ant., 1st RF and 2nd RF

I.

adjustments should he .set for maximum output.

Th~ receiver and signal genc.r'ltor dIals are now set ttl I.:' me and the

C adjustments,

~hown in Figure

3, should be adjusted for maximum output in the same orJer, beginning with the Os.:

C

adjustment and then m,lk· ing: the C adjustments for the Am, 1st RF and 2nd

RF. This proccdur\: should

be

..:arcfully rcpe'ltcd un' til

110 inerc,,-sc in output can be r.::all:cd. The

AVe

Man switch should then be set

II)

Man and the sic-nal

I-:enerator should he set for ,ipproximatc1y :; n~icro

\'oIts.

The Land

C

adjustments should now

be

checked for maximum OutpUl, adjusting the RF Gain control as found necessary to m,lintaill the output at

;lpproximatc1y 20 vOllS.

PositiOn

:;kc

Recei\,c.

Mod

Sec

Text

Set (or appro:.:. 20 volts

Sec text set for band to be aligned

off

Following the frcqUl::ncit:s, shown in Table

3, align the rcmainlllg banus using the same procedure

.t$ above.

TABLE No. 3

RF AND HF OSCILLATOR ALIGNMENT FREQUENC.IES AND ADJUSTMENT DESIGNATIONS

!'REQ.

BAND

IN Me

H-l.3~ t.H-3.4S

3.45-7.4

7.4-14.8

\4.8-297 29.7-54.0

Rf

"

:\DJUST

HI' OSC

L

."T.

RF

Ei

HI' OSC

ADJUST C AT

.56

I.'

3.75

7.'

15.0

30.0

J.j

~.4

7.1S

14.5

29.U

52.0

TABLE No.4

APPROXIMATE SIGNAL INPUT AT IF

&

AF STAGES FOR 20 VOLTS OUTPUT

Output measured across a 600 ohm resistive load at output terminals of rccciva.

RF signals modulated

30 percent at 400 cycles. Signals :lpphcd to tube ltrids through ,I .01 mfd capacitor. Selccllvity switch ;n 3 kc

AVC-MAN .o;wit.::h On MAN. CW-MOD switch on MOD, RF Galli ;Ind Audio Gain at maximum.

BAND SWITCH

Any

Aoy

U5-).4~ me

1.35

3.45 no.:

1.3 .•-345 Ill('

1.35-3

4~ nit"" l,l~-345

In,'

7.40~ 14 8

In".

7.40-14.1I

me

FREQUENCY

AudIO 400 cyel.:s i\udlO 400 eyell's

Mod

RF 4H kc l'o.·lod

R!' 455 ke

Mod Rf 455 ke

Mod RF 455 k.-

Mud ItF

45~ k..

Mod R!' ~_955 me

Mod :~I' l.9~S me

INPUT TO

1'",5,V17

Pin

2, VI6B l)in I, VI t

Pin l.

VIO

Pm t.

V?

Pm I, V7

Pm 7. V5

P'" 7. V5

Pin 7, V6

APPROX. INPUT

U

,"olts

,

.

,"olt•

.35volt<

ClOOO 'meru\'olt.,

110 nllcnwolts

40 lI"n"volts

65 Oller' "'olts

40 Il"novolu

2501llICrtwolts

13

§

8

L41 L42

OT50

e

L38 L39

OT40

e

L37 L36

OT30

8 e

L34 L33

OT20

,

,

i------ --,

,

,

lee!

L..: ________

J

6

8 e e

80@

1/

'\

T8

0

OND

0

~c

0

ANT

GC

0

0

L

'RF

0

e~

- - . "

0

L32

0

2RF

0

@~

0

Tl

0

L3\

0

0

HF

8?

1"'/

~

V3

I 2

:5 4 5 6 e

0

L44

rn

0

0 0 0 0 0 0

0 0 0 0 0 0

0 0 0 0 0 0

TOP VIEW OF CHASSIS

SHOWING ALIGNMENT ADJUSTMENTS

5

<Xi

o

z o

....

::>

....

::> o z o

5

~

::> i1i \

0

....

\i

5

2

0

5

,-

~

100

FIG.3

'AUDIO AND OVERALL FIDELITY CURVES'

CURVE - Audio frequency amplifier.

Input

to

phono 'terminals.

CURVE - Overall fidelity at 2.5 me.

Modulation 30 percent.

Selectivity switch in 13 kc position.

RF Gain set for 20 volts output at 400 cycles.

Output measured across 0

600 ohm resistive lood.

Audio goin control at maximum for bath curves.

1000

CYCLES PER SECOND

FIG.4

-

~

,

\

10,000

100

0

1

• SELECTIVITY CURVES

Overall at 2 Megacycles.

2

NUMBERS DENOTE SELECTIVITY SWITCH POSITIONS

1,2 AND 3 NON CRYSTAL 4

1

5 AND 6 CRYSTAL

3 456 654 3 2

1

1\

>-

:::>

z

(fl

W

:;;

>w u

Z

<I

Z

0

(fl

W

0::

10

0

1a

,

i

I

I

I

15 10

"'

.... ~

l.o::'

5 0 5

KC OFF RESONANCE

!.I

FIG.5

/5

10

15

VII

CONVERSION OF TABLE

MODEL RECEIVER FOR RACK MOUNTING

Tho.: SI'·60()

RCCC1\"er 15

UC$l'i!I1Cd

for either t<lbl..: cahinet or rack mounting.

\Vhcll table modds arc ordered. Ihe receiver is not supplied with a bottom

.:o\'cr plate

SIlH:C the cabinet

SCfV':.s

this purpOSl:. Wh.:n rack moods arc ord..red the rC';":lvcr IS suppl~cd

WIth a bottom cover pl.llC.

but is not supplied

WIth :1 top cover pl.IlC

.;llllCe

In milst elSC!

the r:u:k is of the cabmet

1}'Po.:

A cover pl,tlC kit IS pro\'ldcd, Oil SoCpdr,lt..: order, for conversion to r,lck mountinj!

where table models have been ordered and where the covers arc desired.

The following instructions should be followed when lllslallin~ the -co\'er kit: To install the bottom co\'cr p1:llc. rcmO\'e the twO rear corner nut plate brackets by rcmovlIlg the

Ihr.:c. screws at the lower rear ends of the large side mounting brackcts ;lnd r~place these tWo nut plate buckets with Ihe two slIghtly shaner oues from the kIt,

USll1~ the $,\m,' 'erews. Remove th.:: nut and lock.... asher from the !crcw, near.:st the bottom ec.Ig,; of the chassis. holdmg C,lpaCltur CIS I (~" bottom of I:has,sls pholllgraph) Install Ihe short an!.:!e

bracket, from Ihe kil,

U~l1lg the ...1m,; s..:rew from whkh the nUl and washer wer..: rel1l()vec.I, with the t;tppcd (smaller end) of the bracket replal:lI1g Ihl: nut

The bottom

CU\'U plate is now l1lstatled

US1l1~ the fiv.-:

10-32

screws from the kit ,lnd the two 10,32 screws that previollsly held the hottom of the receiver 10 the cabinet. To install the top cover plate assembly, pldee the cover WIth the dn~1cs faclllg: dl)Wnward tow:trd the chassis anJ with pressure appheJ at the rear of the plate, to slightly compress the rubber chaonel against the rear of the front P,Ut.::!. s.::curc. the assembly in place With the four 6-:;2 scr.:ws from the kit, eng<tging them in the tilpp.:J holes lI\ the brackets through the clearance holes

III the sldc mountll1~ hrack':IS

'6

Symbol

Designations

DESCRIPTION

Hammarlund

Part No.

I

CIA. B,C. D.

CapOICilor, variable.

E,F,G.H

C3.

$.

19.20.

8 sections

Capacitor, .01 mfd

21,22.23.24.

21,29,40.41.

42,43.44, '!1.

34001-0.

23012_.

49,61. 64. 66.

68.10.71. 72.

73.74. 100.

105,115.116.

121. 122,127.

135.153.154,

IS'

C6. 30. 50

C8. 32. 52. 132

Capacilor, 20 rnmf.

Capacitor. 2400 mmf.

....

23003-41(,;

23011-40C

C9. 33, 53

Cll.17,35.55

C12,138.145

CI<

C15,1J9

CI8.25.45.75.

Capacitor. 100 mmf. ..

110. 1I2. 113

C37.57.67

Capacitor. 85 mmf ...

C39, 59. 99.134

Capacitor. 51 mmf

C60.88

C62

C63

C"

C69.107.117.

Capacitor, 33 mmf ......

23003·45C

Capacitor, 1500 mmf.

2301l·62C

Capacitor, 7 mmf .

Capacitor. 1000 mmf.

Capacitor, 15 mmf

Capacitor. 12 mmf ..

Capacitor, 2200 mmf.

Capacitor. 39 mmf .... :

Capacitor, variable ....

Cap.acitor.22O mmf..

....

...

~

23061.168F

23011·58C

23061.155J

23003·94C

2301\·59

..

23003·87C

23023·65UJ

23011·17C

23003.47C

11726·GI09

23003·102C

12'

cn

C78

C19.80

C82

C83

Capacitor. 3300 mmf ....

23011-69C

Capacitor. 404 mmf ...

Capacitor• .5 mmf

23071_67

C"

C87

C89

C91

C92

C93

C"

COO

C97

e98, 102. 103.

104. 106, 108,

Capacitor. 810 mmf

Capacitor. 10 mmf ..

23023·8UJ

..

23072·53

230J3·28

Capacitor. 1200 mmf..

Capacitor. 120 mmL ..

Capacnor. 190 mmf.

Capacitor, 92 mmf. ..

Capacitor, 51 mm£..

Capacitor, 379 mmf

Capacitor. 42 mmf ..

Capacitor. 610 rnmF

Capacitor, 65 mmf

Ca,Iacilor..022 mid ..

2301I·6OC

23071·50

..

...

23071_69

23072.52

...

23071-.58

"

23071·64

..

23011·71

23023-45UJ

..

23071·63

23013-1

109,118.123,

136,146,

148,1.56,157

CIlI

CII4

C1I9,125

Capacitor. variable

Capacitor. 270 mmi.

..

11776·GI

23003.I04C

Capacitor. 300 mmf. .. ::

23003-105C

C120, 126 Capacitor. 1300 mmf .

C128. 1.51, ISS.

Capacitor. 10 mfd, IOOV

159.160

CI29A.I298.

152A,1528

CI30

C131,13]

CI3l

CI40

C141,142

CI43.147.149

CI44

CI50

CI61A, B, C

I

HS Can, Electrolytic

Capacitor.

.0' mid

HS Can. Paper

Caj».citor. 27 mmf_ ..

Capacitor. 2500 mmf

8OOV.

..

Capacitor.

4S0V.

HS

2

3

•

•

20 mid

Can. Elec-

23011-61C

15462·1

15-'161·1

Capacitor. 430 rnmf _. .

Capacitor•.2.5 mfd 200V

CapaC:l0r. 100J mmf ..

Capacitor, 100 mmf

Capacilor. 5100 mmf

Capacitor, .05 mfd ..

23023·71UJ

23003·109C

23911·:i9E

23015·21A

..

23024-24SL

2301.5-16A

23911-77E

23070-40

£1

trolytic

2 Screw

Te~~j~~i:Ph~~o

Input .........

15463-1

......

4904·5

TABLE No. 5

PARTS LIST

Symbol

Designations

£2

£7

ES.8

E9, 10. II, 12

E13.14

E15,16

£17

£18

FI

F2

11.2.3.4

JI

J2

J3

J4.5

LI

L2

L3

L'

U

L'

L7, 14. 24, 35

La

L'

1I0

LII

L12

DESCRIPTION

Hammarlund

Part No.

4 Screw Terminal. Audio

Output _

31141_1

2 SoJdn Term. strip

I Soldcr term. Slr:p

16650-12

(left)

I Solder' term.·~tr:p

(riiht)

6 Solder term. strip ..

8 Solder term. strip

15 Solder term. strip

3 Solder term. strip

(meter)

16650-9

..

16650-11

16650·\0

..

JII6J·Ol

31162·Gl

.......

31454-01

Fuse, 3 Am'p. . .

"'usc,

..

!I.i

AmI) Pit/:tail

Fuse Holder

Fuse Holder, Spare ..

15928-8

158119.1

...

15923-1

15923·-'1

Uial Lamp. No. -'17

Muda

Dial l.amp

Assembly

S~Ck;t

16004·1

31453-1

AIlIenna Input Socket.

IF Output Socket..

15959·1

..

16111-1

Phone Jack ..

Power or Rday

5066-1 receptade

RF Input asse~bly.

dudes C2. 3. L I and

Switch contacts in: fo,

SIA

RF

Input dudes

Switch contaca

RF

SIA

C,.

,.

L2

..

31387-GI in-

,,'

'0'

Inp~; a~~~;"biy:·i~.

35013-1

31 39O·G I dudcs C6, 7. S. L3 and

Switch contacts fo'

SIA

RF

Input a~~e~bly. i~: dudes C9, 10.

II .

L,

'0'

Switch contacts fo,

RF

SIA

Input a~~~~bi;: 'i~: dudes C12.

13.

1< .

U

'0'

Switch

COntaCIS

31393·GI

31396·GI for SIA

RF

Illput assembly, in.

dudes C15. 16. t7.

...

L'

31399-GI

'0'

Switch contacts for SlA

RF Choke:' i92 micro-

31405·GI henries .. ......

.

...

RF Transformer assem-

15612·GI sembly. includes C26,

27, L8, R7 and Switch contacts for SI8 ...•..

31386-GI

RF Translormer assem· bly.

includes C2a. 29.

tacts for SI 8

....

_.

RF Translonner assem-

31389·GI bly. includes C30.

32.

LIO

'0'

31.

Switch contacts for SIB ..•..

31392·GI

RF Tran.sformer assembly, includes C33, 34.

".

LII.

RIO

'0'

Switch contacts

SIB

RF

Tr'a'n"s1o'r~~~ . assmbly. includes C36, 37.

L12

'0'

.

.

fo'

..

Switch con· tacts for SIB ...

....

3 1395·G I

31398·GI

17

L53

MI

PI

P2

P3

P,

L<7

L48

L49. SO

LSI

L52

Symbol

DesIgnations

L13

L15

L16

L11

LI8

L19

L20

L2I

L22

L23

L25

L20

L27

L2S

L29

L30

RF Transformer assembly, includes C38. 39, t i l and Switch con· tacts for SIB

Same as L8.

includes

C46. 47. LIS. R17 and

Switch contacts for

SIC .. .. . .....

..

Same:

35

L9.

includes

C48, 49. 1.16. RIB and

Switch contacts for

SIC ""

Same as L10, includes

C~O.

51. 52, 1.17, Rig and Switch contacts for SIC ..

Same: as 1.11, includes

C53, 54, 55, LI8, R20 and Switch contac~s for SiC .

Same: as L12. includes

C56.

57.

L19 and

Switch contacts lor

SIC

Same: as 1.13, includes e58.

59, L20 and

Switch conlatls for

SIC

RF Choke, 1

~fliil';~~;~

RF Choke. 10 millihen.

ries .

RF

Choke, 25 millihenries " .. ,.

HI" Ost, assembly, includes Ci6,

71,

78,

L25 and Switch con· tacts for SID ..... "

HF

Osc, assembly, in.

c1udes C81, 82, L26 and Switch contactS for SID .. , .. , .

HI"

Osc. assembly, indudes C83, 84.

85.

L27 and Switch contacts for SID ...

HI" Osc. assembly, in· c1udes C8!i. 87, 88. 89,

L28 and Switch contacts for SID ... , ...

HI"

Osc, assembly includes C90, 91. 92. 93.

L29 and Switch cont3ctS for SID

HI" Osc. assembly. indudes C94. 95. 96. L30.

and Switch contacts for SID .

RF Choke. 3,8 millihenries.

..

., . . .

RF Choke. 2 ohms dc ..

RF Choke, 2.7 ohms de.

1st Filter Choke 8.5 H

y,

170 ohms dc

2nd Filter Choke 20 Hy,

440 ohms de .,

I I" Output Transrormer

Tunin~

Meter

Power plug and cord

Antenna Input Plug ...

Antenna Adapter Con· nector

Cable Connector Plug

(for J2)

31404-·GI

31386-GI

31389-GI

31392·GI

31395-GI

31398·GI

31404·GI

15617·GI

15618·1

15619-1

31385·GI

31388-GI

31391-GI

31394_GI

31397-GI

31403-GI

1~16-GI

15611-1

15613-1

31030-2

31031_2

31488-1

4903-2

6143_1

16016-1

15987-1

16071_1

PARTS LIST (Continued)

DESCRIPTION

Hammarlund

Part No.

Symbol

Dc:siRnalions

DESCRIPTION

Hammarlund

Part No.

R46.94

R47.66

R59

R60.61

R63

R69.74

R72

R73

Ri8.98

R19

Rl. 13.26

R2. 12. 44. 52.

57.82.90.91.

92.70

R3. 14. 39, 48.

53

R4, 6. 16.29,

30.83.102.

R5.15.32

103 10110

R7.8.17.18

R9.19

RIO. 11.20.21.

R22, 23. 64. 65,

"

R24,25

R27

R28

R31. 37,41. 49.

54.58.80

R33

R34. 35. 38. 43,

51.56,62,67.

68.75.76,81.

100

R36.96

R40

R42,

50. 55

R<S

R84

Ras

R86, 89, 95

R87,88

R93

Rui9tor 510K ohms watt .,

l-S

Resistor 10K ohms Y2 wall

Resistor 33K ohms

~ watt . . . . ,.

..

',;

Resistor 1000 ohms

I/z

watt

Resistor 510 ohms watt

Resistor 51 ohms wall ..

Resistor 24 "hms watt ..

Res:stor 22 ohms watt

ReSistor 47K ohms watt

Resistor 180 ohms

\Ii

\Ii

Y;

walt

Resistor 150 ohms watt

Yi

Resistor 6800 ohms

Yi

watt., . , .... . . ..

. ..

ResiStor 2200 ohms

\Ii

watt..

Resisor 1500 ohms watt., ., ...

. ...

Vi

Resistor lOOK ohms

Yo

watt., ..

19317-7681"

19309-27881"

19309-2828 I"

19309_4981"

19309_17081"

19309.19381"

19309-18981"

19309-981"

19309-898 I~

19309-3181"

19309-25981"

19309-6981"

19309-5781"

19309-5381"

19309-97BF

Resistor 22K ohms watt..

Yi

19309·1788F

Resinor 20K ohms I wall

Resistor

10 ohms watt . . . .

\Ii

Resistor.

240 ohms watt ..

Yi

Resistor, 1100 ohms watt l<esistor 18K ohm;'

Yi

V.

19310·179BF

19309·IBP

19309-201BF

19309-208BF watt

Resistor 2200 ohms I watt..

.,

Resistor

I megohm

'h

watt

Resistor 27K ohms

I/z

19309·79BF'

19310-5781"

19309_12181" watt.....

.. .. "....

19309.83BF

Resistor variable 1000 ohms.

Resis:or 20K ohms

Vz

watt ..

Resistor 56K ohms I

15363-1

19309·21881"

19310.186BF

watt...

Resistor 470K ohms watt .....

Res:stor 680 ohms watt ..

Vz

Vz

19309-113BF

19309-45BF

Resistor variable SOOK ohms ., .

Resistor 2500 ohm 10 watts .

Resistor 82K ohms watt

Y2

Resistor 120K ohms watt .

Vz

Resistor variable SOK ohms includes switch

SIO ..

15342-11

19396-1

19309_287BF

19309-18181"

15342-21

"

Symbol

DC~lgnations

T.

DESCRIPTION

PARTS LIST (Continued)

Hammarlund

Part No.

Symbol

Designations DESCIHI-'TlON

Hammarlund

Part No,

X4

XS

XI8

X21

YI.2.J,4,5.6

VI

V8

Miscellaneous

Tube soc:ket, miniature, ceramic, less center shield . . . .

Tube socket, miniature, ceramic.

with center shield .

. . ,

Tube socket. "Noval"

Crystal socket. c:eramic.

for c:rystals VI to Y6

Crystal.

order special.

spedfy signal fre.

quency ...

15989-5

15989-J

16100-1

16092-5

31473-spec.

Crystal. l.5mc

Crystal. 455kc .

Wrench.

SCI screw No.6

Wrench, set screw No.8

Wrench. set screw No. 10

Snap Bulton Plug .

ll130-l ll~71-1

11806-2

11806-l

11806-4

29619·2 l1275·GI Shaft Coupling, rigId .

Shaft Coupling, Rexible, soh..

. , . .

Shalt Coupling.

R~~ible.

stiff..

.

. . .

Spring. l'elainer for

RF

coil assemblies"

Spring, retainer lor RF

415·G3

41$·G2 liOOl-1 coil' _ " .

. .

Spring, grounding for IF

310G4-1 transformer shields ' JI023·1

Spring. com'ersion switch . . .

Spring. indicator slide

Spdn!:". band change

31125_1 l1126_1 detent ., ".

Knob, frequency control

Knob, tunin!: lock

Knob

&

Skin (large) ..

Knob & Dial (RF Gain)

.

Knob & Dial

(Audio Gain)

Knob

&

Dial

(Crystal Phasing)

Knob & Dial

(Beat Freq. Osc.)

Knob

&

Dial

(Selectivity).

..

,

Chart, frequency control

Spring, anti-backlash , l120S-1

31434·GI l1<462·GI l1215-GI

J1227-GI

31227·G2 l1227·GJ l1U7·G1 l1227-G5 l1463-1 l12l9-1

/9

FIG.6

REAR VIEW OF RECEIVER

20

FIG. 7

TOP VIEW OF RECEIVER

21

FIG.8

TOP VIEW OF RECEIVER

CAPACITOR SHIELD REMOVED

22

...

o · u<

FIG.9

BOTTOM VIEW OF" RECEIVER SP-600-JX

23

e.::=f,j--R"

ROO

.-"1---

"

'"

,.

",

"

e,

C . . .

'"

. "

.,.

C, m

;C147

-::::~~~ll

~n t

:::"$-t!==:R"

C\4$

FIG.l0

BOTTOM VIEW OF RECEIVER

TUNING UNIT SHIELD REMOVED

lSI RF

VI

68A6

,

FREQ.

CONTROL

2ND RF

V2

68A6

JI

(

'"

V7

GSA

...

•

•

:!tcr-,---=-,------,--,

~ ro

~

'"

TIl

•

'25 rf

CO,

".

,

CO, s"

®-

r1'

m

R~~

•

;;

C1!~

5

C7'

'"

® t '

K';=" ' -

~ ,,;~ f--11rt i

•

,

,

I

I

CIC~

"

CIO

__ L __

...L...____

L __

.£

J. _

,

TUNING

~+ C4~

,

-

I"i~;r. RI~

I

, uF t

,

L_C'7"C/+-,-c--'/~CIH

J _ . . /

I

i

l----*-h

~ t

C66

••

us

~ ~

~

.------iIHii

T

, C81

f

-,

I

,

I

,

I

,

I

,

I

I

.1~~"

,

I

I .

,.

,.

I

)'1

I I

I I

I I

I I

I I

I I

I 1 /

/rf

I I

I I

I ,

: I

,---0-,

..,IC95

*

t

I I

L30

~

'-----.,jIH"!!:---'"1.1-- •

I,)

" w

~ s.

ffi

"

n n

RELAY

/

/

/

.

I

I

N

"•

,.------

I

I

I

I

I

I

I

I

'ntl2q:~f"sa::JN--

1"·~<IM,

CIO!

---

...

I

" , ' - '

I

I SINGLE CO!'iV(IISlON

I .S<l·T4 tile

f

<,

"

2Htl MIXER

1ST IF

GATE

"

',nv

~.~

~

GO ss.

,

,

:'

~R"1

: .-7

o~

1..,-- .....

_ _

0_°_

SELECTIVITY SW.

'"

CONV£IlSION

.<

2>ll> IF

YOO

6BA6

.12

REGULATED 150

v: __

~CJ6IC

'"

S8 Ave

I-':~

<

,

•

Cc o '

.~ co

I

I

I

,

I

f

"

,

,

•

<

•

10 V.

CI RCUIT DIAGRAM

25-26 or

RECEIVER

V,.

2/lD DET

GAL5

a

Ave.

VI5

LIMITER 6-

OUTPUT

METER.

6ALS

- XTAL

DRIVER

VII

6BA6

2ND IF

--

--,

,

,

,

---1,.J

,

J

,

, .

;;

,

'",±

:OI

•

N

•

" 0

6BA6

,

,

1-=,.

2

=

~

0"'-

•

•

•

NON XTAL

, c

,

,

,

,

,

,

,

,

,

,

,

1

:~1

,

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"

•

0

•

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:

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~

'+-=:_{,r

II

II

1

I...

~

1lI1!';!

l

~

U1.I

,

I

I

I -

s:Jl

a:"'-

•

l

C;

.

N

1

,

<l:

~T

U -

0

--'

I

----

-

VI2

BUffER

CI38

CI39

;;;

•

,.,

~

*"

R67

~ ~C!41

~

: $C142

'EO 150

~'

v._

Lt.

m

'

' -

\

1 OA 2

~V~-

VDLTAGe RCG.

V '0

, RECTIfiER

6ALS

S8

AV~r:--

, lolA"'.

0

•

•

•

•

•

10 V.

:::~

-~

'"

-

,

,

"

I

I

I

I

•

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OFF :

~

-+ '

IolDD-CW

I

I

I

J

,

,

•

57

,v.

IolnEIl

Ae

~r-r--'=

IF

'"

•

•

,

"

12AU7

VI6B

1ST AUDIO

0'

-

~

•

•

,

,

0

•

•

PHONES

§, r

L.-

"

'"

I T7

'"

I r,

1;

,

•

'

'

,

,

,

i

J.e

~

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J'

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•

•

~

VI'

OUTPUT

GVGGT

,

'r-

I

.-

I

R.f.

''0

'" k©1

~

"

I

OUTPUT

LEVEL

,w,

'l.F..A.F, LEVEL

,

"

"

A.F.

RIO!

t

FIG. '1

:UlT DIAGRAM OF RECEIVER

25-25

o

WHITE-BlA K

WH-GREEN

"

,

-,

BLACK

-

B A K-WHI

'@

,.

LU -RED

,

,

MAIN WIRING CABLE

...,....-...; CIQ2: l iGR~C~'~£O~-,F.i'~.J"-'-GR

I 2:3

'f

S h

'

NOTE. SWITCH

ON TUNING

UNI~S

MOUNTED

BY BANDswrTCH OPERATED

2-3 CLOSED 8ELOW

'-2 CLOSED ABOVE 74 Me

co,

'eo

,

"

27-'

EI

C

"

!:

"

"

WHlTE-Q, ACK

;~vi56'

~i i6~

N-

...

2

"

":"'~ ~

.

.i:f

'0

T2

WHIT'

,

.

CI06

27-28

FIGURE NUMBER 12

CHASSIS

j;CC!'0,!!N~N!!:E~CC!T~I02!N~D~1A",G",R.:.:A~_

•

•

•

•

59

"

~

L-:a-:-4

~

GIiASSIS

,

0 0 0

Ili

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