BC-61 I WALKY-TALKY
1 COMPLETE W I T H CASE
. . .
B C - 6 1 1 W A L K Y - T A L K Y C H A S S I S , NEW! Excellent, new, Spare Chassis for above, prlced so low t h a t in the event of trouble i t would be cheaper t o insert a new chassis.
Also excellent for t h e Amateur or Technician who pre- f e r ~ t o make h i s own style of Walkv-Talkv. Supplied less tubes (1-1R5. 1-15s 1-1T4 and 2-384 tubes required), and less plua-in bsc. and'^^ Ant. Coils, less crystals. Supplied w i t h Schematic Wiring Diamaml.
Shp. wt. 8 Ibs.
TG-34 CODE PRACTICE SET
I.earn to ronv mde.
i s r e e l s ) , available from many other surplus houses. Also usai,le f o r prac- ticina "sendinp" by means of internal oscillator keyed by external hand key. Operates from 9 0 to 1 2 0 V. or 1 9 0 to 2 4 0 Volls, 6 0 C v ~ l e s AC. Units are Used- Very Good e o n d ~ t i o n . Shpg. wt. 54 Ibs.
s p E c l A L . . . $14.75
T G - 3 4 - 1 5 ABOVE. N E W - U N U S E D . . . . . 818,95
ELECTRIC DEFROSTER
I ~ I
FOR CAR OR TRUCKBC-1306 TRANS.-RECEIVER FOR MARS, HAMS, ETC.
For MARS application. 3 8 0 0 to 6 5 0 0 KC, MO or Crystal Control. Includes Crystal Cali- bratlon and Net Controls. NEW UNITS, with a l l tubes except Final RF 2E22 tube. Shpp.
wt. 50 lbs.
E A C H . . ... $22,50 --
PE-237 POWER SUPPLY For ALlOve BC-1:%06. Supplies a l l necessary voltapes and cur- r e n t for hoth transmitter and receivep sections. O p e r a t e s from 6 . 1 2 . or 2 4 Volts DC.
"1.IKE-NEW" units. Shpg. wt.
1 2 5 Ibs.
E A C H . . ... $14.95 REMOTE CONTROL FOR MOBILE
Volume i n speaker or Dim: 6sis" long. 5V4"
Shpz. wt. 1 0 Ibs. PRI C A N N O N P L U G C O N N E
OR MARINE USE
HI-PRECISION FM SIGNAL Generator-Mobile Band
m B O * u L OHM L,Ne ~;;~E&,mL DIAL IILM ZERO SLT
I / I / RFUMRWL
SENSATIONAL BARGAIN!! TCS TRANSMIT- TERS. RECEIVERS, AND ACCESSORIES
You've never seen TCS Transmitters and : f . , c i , . ~ r s priced s o low! This communlrations ''wo~.k hvr.u" of t h e Navy and Coast Guard never sold in s u r r ~ l u s for less than $300. per s e t (Acq. cost over 8 4 0 0 0 0 0 Per set).
It's ideal for mobile or fixed statlun use; precise, trou- ble-free, and consistent. Excellent for Manne-Band ( 2 - 3 mc) arrDlications if certain front panel controls on
~ ~ ~ F ~ ~ & ~ ~ ~ ~ ~ ~ ~ , " ; , F ~ ~ ~ ; P , T p~;e;;;;~;:~;f,F:?"p;d
requi~wzments regarding- second harmonic radiation, stnee t h e transmitter uses a Buffer staae, p l u s (varia1,le) link eouplinp between t h e final RF Tank and a pi-network which couples t o t h e antenna, a l l of which reduces har- monic radiation t o absotute minimum. Other features of TCS Transmitters and Receivers arq: *comolete eov- erage 1 . 5 t o 1 2 . 0 mc. all band-switchmg. 24-channels crystal-control, nlus o n e channel manual t u n i n p (in transmitter precision VFO). r u s e s 1 6 2 5 instant heat- in8 filament tubes (equivalent $0 Type 8071, i? RF Amp and Mod. sections of Transmitter t o minlmlze dram.
*Rated a t 4 0 w a t t s CW and 2 0 watts phone Outout when transmitter plate voltape i s 4 2 5 V.. b u t t h i s power can be easilv doubled bv using 6 0 0 volts plate SUPPIY. *Transmitter or Receiver d e s i m e d to operate from either 12. 2 4 1 1 0 V. DC o r 1 1 0 / 2 2 0 V. AC power supplies. ~ b w e r Supply ' Diagrams furnished.
*Receiver i s super-sensitive superhet. w i t h excellent sensitivity & selectivitv ehsraeteristies. gnd tncludes BFO circuit f o r CW reception. Units priced below are complete with tubes. ~ o o d clean condition b u t untested.
TCS-S(to 9 ) T R A N S M I T T E R , w i t h a l l tubes. schematic diagram and power supply diagrams, as outlined above.
Shpp. wt. 6 0 Ibs.
P R I C E E A C H ... $ 3 9 1 9 5 T c s - 9 ( t o 1 4 ) T R A N S M I T T E R . same as above b u t has minor modifications which make these models more
...
desirable. E A C H . $ 5 9 . 9 5
TCS-5(to 14) R E C E I V E R , m m p l e t e w i t h tubes and
T C S A N T E N N A L O A D I N G COIL.
Uqed with above equipment t o Obtain maximum performance w i t h short whip antenna. Has fi-position tapped switch f o r various lengths of antenna.,, I n m e t a l housing 6 " A. x 91/1 W.
x fin/&" D. Shpg. wt. 6 IhS.
E A C H ... $ 7 . 9 5
All Above Material Subject to Prior Sale. 25%
Minimum Deposit with All C.O.D.'s. Min. Order -55.00. All Prices F.O.B. Our Address.
-
TELEMARINE-
COMMUNICATIONS CO., INC.
142 WEST B'WAY, NEW YORK 13. N. Y.
PHONE: COrtlondt 7-5444
30-40 M C DELUXE F M RECEIVER
TRANSMITTER C O M P A N I O N for ABOVE
BC-659 TRANS-RECEIVER CONVERT TO CITIZENS BAND
June-'59 issue of CQ Maga- zine furnishes the necessary conversion data to convert this low-nriced Trans-Receiver for satiifactory operation i n the new Class D Citizens Band.
This ~ransmitter-Receiver. i n i t s unmodified form, OPPIateS over a frequency range of 27 0 to 3 8 . 9 MC. has 2 crystal-mntrolled channels direetii controililig t h e Receiver frequency and through AFC action controlling the Trans- mitter frequency. I t is rated a t 2 watts power output. Voice F M , and uses a total of 14 loktal type, low-drain filnmen- t n r a tnlher. ... Its romnnrt dimenfiions. ll7/8" x 163,'s" x 21 I/*" with^-buiit-in loudspeaker ' a n d Meter Indicator makes i t ideally suitable for under-dash installation. Power Supply i s separate either dry batteries or Vibrator Power Supply PE-120 which operates from 6 12 or 24 Volt9 M All ,,nits are with tuhes. and U'SED:VERY GOOD
- ...
(untested) condition. Shpg wt.' 50 Ibs.
. . . .
BC-659. USED-GOOD as des. E A C H . . $10.95
BC-683 MOBILE FM RECEIVER
Provider 1 0 push-hultoh selected channels as well ns continuous Variable t u n i n a over t h e entire r a n e e of 27.0 t o 39.0 me. Io- ciudes features such as: huill-in
P R I C E , EACH. Used-Excellent C~mditicm. Not
~ E s n z D . . . $24.95
BC-221 F R E Q U E N C Y METER. T h e best instrument possible for determining frequency of transmitter or receiver, align- ment testing etc. Laboratory Precision! Range 125 K C to 20.00'0 Kc. i'dnplete with r a l i h r a t i n g Cwstal. tubes, matrh- i n g Calibration Bcmk. Tested, Used-E~cellent.
Shpg. a t . 65 lbs. ... EACH$74.50 TCS-12 V DC POWER SUPPLY
FOR MOBILE OR MARINE
BY
Kenneth B. Grayson, W2HDM
3 1 9 6 0 by Cowan Publishing Corp. A11 rights reserved. This book or any parts thereof may not be reproduced in any f o r m o r a n y language w i t h o u t permission of the pub- lis her.
L i b r a r y of Congress Catalog Card Number: 59- 15267
T A B L E O F C O N T E N T S
Introduction
...
4APA.38
...
5APN-1
...
6APR-1
...
7APR-2 (See SPR-2) APS-13
...
8ARB
...
9ARC-1
...
10ARC-3
...
12ARC.4
...
14ARC- 5 (See SCR-274) ARC- 5 VHF (See SCR- 274) ARJ (See ATK) ARK (See ATK) A T J (See ATK) ARN.7
...
16ARR- 2
...
1 5 ART.13...
20ASB-7
...
18AS-81-GR
...
22ATK
...
19BC-AR-231 (See RU- 16) AC-189
...
23BC- 191
...
24BC.221
...
25BC-312 (See BC-342) BC-314 (See BC-342) BC.342
...
26BC-344
...
26BC-348
...
27BC-375 (See BC- 191) BC-438
...
28BC-474A
...
29BC-603
...
30BC-610
...
31BC-611 (See SCR-619 BC-620
...
32BC-640
...
34BC-645
...
36BC-6 52 (See SCR- 506) BC- 6 530
...
37BC-654
...
38BC-659 (See BC- 1335) BC-683 (See BC-603) BC-684 (See BC-603) BC-728
...
40BC-733
...
42BC-745
...
41BC-779
...
44BC-794 (See BC-779)
...
BC-906 43 BC-969...
46...
BC-1000 47 BC- 1004 (See BC-779) BC- 1023...
48...
BC-1206 49 BC-1335...
50BN
...
51B P
...
52C3 ( S e e F 3 ) Subscription t o CQ
...
112CRC-7
...
53CRO-208
...
54....
CRT-3 Gibson G i r l 55 DAE...
56F 3
...
572F- 11 (See RU- 16) GO-9
...
58...
GRR-5 60...
Ham Shop 8 5 1-122...
641-177
...
591-208
...
62JT-350-A
...
65LM (See BC-221) MARK11
...
66MD-7 (See SCR-274) MN-26
...
67PRC-6
...
68...
PRS-3 69 R-174 (See GRR-5)...
RAK- 70 RAL...,...
71RAO-7
...
72RAS
...
73RAX
...
74RBH
...
75RBL
...
76RBM
...
77RBS
...
78RC- 56
...
80RC- 57 . . a . 0 . . . 81
RDC
...
84...
RDR 82...
RDZ 9 1...
RU-16 87...
SCR-274 88 SCR-284 (See BC-654) SCR-288 (See BC-474) SCR- 300 (See BC- 1000) SCR- 506 (See BC-652)...
SCR.522 92 SCR- 585 (See SCR- 6 10) SCR- 578 (See CRT-3) SCR- 593 (See BC-728) SCR-608...
9 4...
SCR-610 97 SCR-624 (See SCR- 522) SCR-628 (See BC-603) SPR-1 (See APR-1)...
SPR-2 98 Subscription t o CQ 112 TBS-99...
99TBW (See GO-9)
...
TBX 100
...
TBY 102
...
TCK 103
...
TCS 104
...
TG.34 106
...
T S - 3 4 / ~ ~ 107
...
T S - ~ ~ ~ / U P 108
...
VRC 8,9,10 108
...
V V X - 1 109
Introduction
We have received so many hundreds of r e q u e s t s for circuit diagrams of s u r p l u s equipment that we a r e p r e p a r
-
ing this book in self defense. In it you will find, in addit- ion to the circuit, some info which should be helpful in getting you s t a r t e d on a conversion. P l e a s e keep in mind that CQ is always interested in the result of your efforts.
Many of these Sows' Ears make wonderful Silk P u r s e s , and should your f e e t t r o d f i r m l y over unfamiliar t e r r i t o r y in the jaunt why not (once you have untangled the above metaphors) t r a c e out a map for the following tourist. CQ Pays f o r Articles. With just ordinary luck you can get back many times the price of t h i s book.
A P A -38
The APA-38 is a Panoramic adaptor which, when connected to your receiver w i l l let you observe the modulation characteristics of received signals and displays visually all signals present in the passband of the receiver IF.
The APA-38 was originally used with the APR-1 and APR-4 Receivers for identification of enemy radar signals. The adaptor may be connected to any communications receiver by tapping into the plate of the f i r s t detector (mixer); don't forget to use a blocking condenser and coaxial cable such a s R G - 5 8 / ~ .
Since the adapter input is a t 30 mc, the I F of the APR-1, you will have to convert from your receiver IF to 30 mc. The APA-38 has an I F of 6.5 mc.
A sweeping oscillator is used to convert the incoming signal, and the sweep voltage is also applied to the scope for synchronization.
Provision is made for use of the scope a s an oscilloscope for the examination of pulses. The APA-38 R F circuits a r e stagger tuned to provide the wide response desired.
The sweep oscillator may be reduced in frequency coverage to allow a closer examination of a particular portion of the band. This effectively expands the center portion of the band under exam ination.
The APR -1 is a Naval A i r F o r c e VHF-UHF r a d a r s e a r c h receiver covering the frequency range of 80 m c to 950 m c in two bands. The basic receiver, without plug-in tuning unit is the CPR-46 ABC. It is essentially a n I F amplifier detector audio-video amplifier having a 30 m c input to the I F amplifier. The output impedance is 600 ohm audio and 100 ohm video.
A 1000 cycle audio tone can be used a s a BFO if a cw signal is being received.
The 80 to 370 m c tuning unit is designated CPR-47 AAE and the 290 t o 950 m c band is covered by the CPR-47 A A F tuning unit. Signals can be picked up a s high as 2850 m c using harmonics of the oscillator.
power consumption i s 6.25 a m p e r e s a t 12 volts using the internal
dynamotor. Provisions have been made f o r a n external power supply to provide 6 volts a c o r dc f o r the filaments and 250 volts f o r the plate supply.
Schematic Circuit Diagram of Type CPR-46ABC Radio Receiver Model APR-1 Equipment.
The ARC -1 is an airborne transmitter receiver covering a frequency range of 100 to 156 mc. It is crystal controlled and uses t h e s a m e crystal for
control of the transmitter and receiver. The IF is 9.75 mc. Power output is 8 watts. The equipment is amplitude modulated. A guard channel is a l s o monitored during reception. The receiver is a conventional superhet,
using a crystal multiplication of 18 t o obtain the mixing frequency for the proper IF output. On transmit t h e heterodyne oscillator is mixed witb a 9.72 mc signal to obtain the s a m e output frequency.
The equipment is capable of operation on ten channels, each channel being selected with a pre-determined setting of the auto-tune dials. The equipment is designed for remote operation in a plane and requires 28 volts a t 7 amperes during reception, and ten amperes on transmit. For short
durations during transmission, when switching channels, a s much a s 15 amperes may be required.
The input is 50 ohms coaxial to a whip antenna, and the output i s normally to a headset. A .carbon microphone is normally employed with the equipment. Crystals used in the ARC -1 are in the range of 5000 to 8120 mc. The oscillator is below the signal.
Tne ARC -3 is b a s ~ c a l l y a n airborne radio transmitter-receiver equipment which, witn accessories, provides a i r to a i r and a i r to ground communications.
I t nas a l s o been used in s o m e shipboard installations. I t operates in t h e VHF region over the frequency range 100 to 156 m c on eight pre-set frequencies, each of
wnich i s c r y s t a l controlled. The ARC-3 is tone o r voice modulated (AM). It operates from a nominal 28 volts dc a t a current of 5.5 a m p e r e s on receive and 1 2 a m p e r e s on transmit. The power output is approximately 8 watts.
The transmitter uses nine tubes and is c r y s t a l controlled a t a frequency 1/18th of the output. The modulator Is capable of operation a s an interphone amplifier when desired. This is accomplished by a positioning switch (S-103) located at the bottom of the transmitter and accessible from without. A barometric (aneroid) gain control reduces the audio by 6 db at 15,000 feet and 12 db a t 25,000 feet. Also in the modulator i s a sidetone amplifier which can provide 0. 8 watts of audio. The transmitter voltage requirements a r e 2.45 a m p e r e s a t 28 volts and 325 m a a t 410 volts for full power output.
The r e c e i v e r is known as the R - ? ~ / A R c - ~ and is a superheterodyne, crystal controlled with an intermediate frequency of 12 megacycles. The oscillator is on the low side and the c r y s t a l used is multiplied f r o m eleven to eighteen times,
depending upon the desired receiver frequency. A noise limiter, c a r r i e r operated squelch, and AVC are provided to produce a fine piece of equipment. In addition, a flat response between 90 and 150 cycles is provided to allow the use of received navigational signals. T h e r e c e i v e r power requirements a r e 28 volts at 3.5 a m p e r e s and 210 volts a t 125 ma.
[ I ] .
a
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A 3 Z d Z k e . 9 0
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9 . 2
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c m a , a , o a g u
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& Q ) c d S
cd
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220 mc conversion (the only practical band to use this unit on). For this conversion the RF coils can be squeezed a bit and an external oscillator fed into J-106. This oscillator may tune either 221-225 m c o r 219 to 224 mc.
The e a r l i e r model of this equipment, the ARR-1, was quite similar circuitwise, but used acorn tubes.
The ARN-7 is an aircraft receiver used primarily for radio direction finding by aircraft. It is a superheterodyne receiver and covers the frequency range of 100 to 1750 kc in four bands. It normally operates from a power supply of 115 volts 400 cycles and a 28 volt supply for the operation of certain relays.
When a supply of 12 volts is the only d. c. available the RA -59-A is employed for relay control in addition to the 115 volt 400 cycles.
The receiver required a control box C - ~ / A R N - 7 for tuning and operation.
Several loop antennas a r e available such a s the LP-21 and the LP-31. A sense antenna is required for proper operation of the direction finder a s well. The output is to headsets as well as to indicators when the loop antenna is used. It is not ne.cessary to make use of the loop antenna if direction finding characteristics are not required. The indicators used a r e the I-81-A and I-81-N panel type and the I-82-A and I D - ~ ~ / A R N navigators type compass indicator. The indicators indicate the true null bearing of the direction finding loop. The nulling of the loop antenna i s either manual, o r automatic. When automatic direction finding is
employed the loop antenna w i l l automatically locate the station to which the receiver is tuned.
ALIGNING FREQUENCIES
BAND ALIGN FREQ. L<OOP ANT 1 s t R F 2nd RF Osc R F
The IF frequencies are 2 4 3 . 5 k c and 1 4 2 . 5 k c depending upon the band
J setting.
ART-13
The AN/ART-13 is an airborne transmitter for use in patrol aircraft. It
covers the frequency range of 2000 to 18,100 kc
.
Some versions have an additional low frequency band of 200 to 1500 kc. The equipment uses an external dynamotor power supply providing 400 volts dc a t 225 ma and 1250 volts a t 250 ma. This is in addition to the 28 volts dc for the operation of the tube filaments and motors. The equipment is preset to any frequency within the range specified and may be automat-ically tuned upon selection of a particular channel by the radio operator. The power output is approximately 200,-watts from an 813. The unit uses a VFO, but h a s a crystal calibrator included to check the frequency. At high altitudes a switch is actuated t o reduce power.
Output is either CW o r voice, amplitude modulated and keying is'accomplished by means of a keying relay.
1
The AS-81/GR is a direction finding loop attachment f o r u s e with any
communications r e c e i v e r covering the frequency range desired. It uses one of four loops, depending upon the band desired, and supplies loop directivity to the
receiver. A twelve volt vibrator within t h e s e t s u p p l i e s a l l necessary high voltages.
Loop
=27/GR A T -28/GR AT-29/GR A T - ~ O / G R
Color Code White Red B lue Yellow
Freq. Range 1.1 to 2.1 mc
Provision is made for loop balance and s e n s e to determine the direction of the received signal.
REF.
- NO.
R l R 2
R 3 ~ ~ 4 '35
R 6 R 7 C l C 2
DESCRIPTION I MEG 1/2 WATT
s o o n 112 WATT 50,OOOn l / 2 WATT 2 5 , 0 0 0 n 1 0 WATT 1 5 o o n POT 5 o o o n 114 WATT 12-252 Y Y F 6 0 0 U U F 5 0 0 V
REF.
NO.
c3.=4
DESCRIPTION .Ol UF 3 0 0 V
REF.
NO. DESCRIPTION
-
LM-I NEON LAMP LM-2, LM-3 PILOT LAMP FUI 2 AMP FUSE SW, SWITCH, ROTARY SWz,SW3 SWITCH, TOGGLE RFCI JMH 1 5 n
RF Cp 5 5 TURNS # I 6 ENAMELED COPPER WIRE TI TRANSFORMER, POWER
b Capantors.- C i m t Element c, c,
c, C. (none) c,, C,, C,. C. (see c
c.
Cl0 c , , c,, c,,
C,. c,, c,, c,,
el8
T h e BC-189 is a p r e d e c e s s o r of the BC-312. I t c o v e r s the r a n g e of 150 k c to 13 m c by twelve s e t s of plug in coil d r a w e r s . T h e r e c e i v e r i s a superheterodyne with a n IF of 470 kc. T h e BC-189A has a n IF of 850 kc. When operating n e a r the IF frequencies s o m e instability will b e noted.
Power is supplied by a dynamotor, and the input i s 12V dc. Output is to a p a i r of headsets.
circuit element dssignotion, and rolues.-n. Rcststors".-
Value
-
30.000 ohms 75,000 ohms 1 megohm 500.000 ohmc 1 megohm 2.000 ohms 30,000 ohms fi0 ohms 1.000 ohms 3 . M ohms
..ln arldltlon fa thr rrrlsfo~s lndicatcd on the clrcult diozram of Aeure 2. roll sets C 112. C-142-A. C-I*.
and r 1 1 3 A have a 2 ~ . 0 ~ - o h r n reslrfor tRS-148) connertcd to the secondary tcrmlnnlr of buih transformers I., and 1 4
The BC-375, built by G E , building 89, 1 River Road, Schenectady, N. y,
,
is an archaic behemoth whose design was finalized in 1935, and was produced in tremendous quantities for war destruction in planes and other expendable vehicles. The design engineers responsible almost had heart attacks when they received an ARC-5 f o r t e s t comparison and found it to be a fraction of the s i z e and weight, infinitely m o r e stable and put out m o r e power.
The BC-375 is designed f o r 28 volts; the BC -191 for 1 4 volts, otherwise they a r e almost identical. T h e r e a r e a few moderately usable p a r t s in the transmitter and t h e tuning units make nice cabinets.
Radio transmitter BC-101-(*) with transmitter tuning unit TU-6-A or -B--schematic diagram.
T h e s e equipments a r e r e c e i v e r s used f o r communications purposes. They a r e basically identical in appearance, T h e B C -31 2 is a s u p e r heterodyne r e c e i v e r covering a frequency range of 1500 t o 18,000 kc. It o p e r a t e s f r o m a 12 volt
s o u r c e (dc) a t about 7 1/2 a m p e r e s , f o r those models with thermostatic h e a t e r s f o r oscillator stability, and about 4. 5 a m p e r e s f o r those models without such
heaters. An a c model, operating a t 110 volts a c i s known a s the BC-342. Those models using h e a t e r s consume about 100 watts, while those without use about 75 watts. T h e intermediate frequency is 470 kc.
T h e BC-314 is the low frequency counterpart of the BC-312. It o p e r a t e s o v e r a frequency range of 150 to 1500 kc. It has a n I F of 92.5 kc. T h e BC-314 has a n a c counterpart in the BC-344,
The BC-438 is a heterodyne frequency m e t e r with a range from 195-215 mc.
It uses a c r y s t a l a t 4.1 mc to provide a 20.5 m c standard frequency (205 m c tenth harmonic) and a variable 19.5
-
21. 5 m c oscillator to z e r o beat the unknown signal f o r measurement (again using the tenth harmonic of the oscillator) o r for providing a signal for receiver adjustments.The BC-474-A is a portable AM radio transmitter-receiver covering the frequency range of 2.3 to 6. 5 mc. It is capable of operation on both CW and voice.
Power is supplied by a 90 volt dry cell and a 1.5 volt d r y cell, or a hand generator, GN-44-A f o r the transmitter. Transmitter output is rated a t 4 watts. A
35 foot antenna and a 35 foot counterpoise a r e required f o r proper output and operation.
The receiver is a superheterodyne with an IF of 455 kc. The input is to an R F stage and the output to one o r two p a i r s of high impedance headsets. T h e transmitter is VFOtd and uses a s e p a r a t e power amplifier f o r the output stage.
The power amplifier is keyed f o r CW operation.
V.8
1." i*,C,,G " - 2
2." 2.76, .I.* "-1 I . I C .
".
" r .(..LI'I/" C O * * ~ l l E " 1,-C. OY.."C
1.1.101167 O L I I C I O I . I7n I U D .UO#O
Receiver achematio, Receiver T r m s m i t t e r RC-474-A.
C 5 100 M M F i 9 1000 MMF 1 4
Tronsrnitter wchematic, Receiver and T r a ? u ~ n i t t e r BC-474-A.
i, i t :
I?.
While it is possible to use the BC-610 with the tuning boxes, the stability resulting is not corlsistent with current amateur standards and will probably lead to considerable correspondence with FCC monitoring stations plus rapidly deteriorating neighbor relations due to TVI, BCI, HAI, EOI, etc. Ad Nauseum. 4 screws remove the tuning box assembly. It is a simple matter to drive the transmitter with a low power VFO by mounting a SO-239 connector on the exciter deck and driving the 807 buffer-multiplier. If a higher power exciter is available, the 250th final may be driven directly. Don't rejoice yet. The TVI is still there.
The BC-620 is a low power, frequency modulated transmitter-receiver unit, covering the frequency range of 20 to 27.9 mc. It operates on two preset c r y s t a l controlled frequencies, which a r e selected by a front panel switch. It is designed to operate from batteries o r a s i x o r twelve volt power supply system.
It was originally intended for mobile o r portable use,
The receiver is a superheterodyne with a 2.88 m c intermediate frequency.
The receiver local oscillator is c r y s t a l controlled. The t r a n s m i t t e r operates with a VFO. The VFO is held on the proper frequency by a reactance tube which is in turn operated by receiving a s m a l l portion of the transmitted frequency, and correcting the VFO to IF.
T r a n s m i t t e r power output is approximately one watt. The receiver uses c r y s t a l s in the frequency range of 5.7067 m c to 8.340 mc. The power require- ments of the BC-620 a r e a s follows:
FUNCTION Battery Battery No. Volts Amperes
Receive Rec ''A l 7 BA -40* 1. 5 0.7
Receive Rec "B" BA -40* 90. 0 0.025 Trans. Rec llA l 1 BA -39&BA-40* 1 . 5 0.7 Trans. Rec llGTT BA -39&BA -40*90.0 0.045 Trans. TR. "A1' BA-39&BA-40* 7.5 0.300 Trans. TR. "Bt1 BA -39&BA - 4 0 q 50.0 0.045
*BA -39 and BA -40 a r e multi-voltage batteries.
Note: Red dots on the t r i m m e r shafts indicate the side of the slot that should be towards the dial card. The width of the slot is about one-tenth division. In c a s e the red dot has worn off, i t s proper
I position can be found by fully meshing the capacitor. The end of the slot near the 0 of the 0-6 scale i s the end that should c a r r y the r e d dot.
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The BC-640 is a ground type, rack-mounted t r a n s m i t t e r f o r the 100 to 156 m c band f o r general communications with a i r c r a f t It is amplitude modulated,
providing 50 watts output over the band. Provision is made f o r the use of tone modulation when M C W operation i s necessary, Operation is c r y s t a l controlled, with frequency changing being accomplished by changing the c r y s t a l and
the circuits. Crystals used a r e in the 5555.5 to 8666.6 m c range, for a total
multiplication of 18 times. Various sections make up the complete transmitter and each is individually removable f o r repairs. Input power is 110/220 volts 60 cycles single phase. Minor differences exist between various models such a s the addition of dial locks, and the reduction in the number of m e t e r s employed in t h e RC-640(R\
This is the biggest, most powerful TVI generator ever built, and w i t h slight modification will be able to completely blank out a l l vhf and uhf
channels f o r miles around. This gives TVI even when turned off.
The BC-645 i s an a i r b o r n e IFF t r a n s c e i v e r f o r 470-495 mc and transmitted either a pulse o r rriodulated CW signal (30 kc). T h i s unit can be converted for 420 m c ham use, r a t h e r easily. F o r conversion details, s e e CQ, December, 1956, P. 66.
The BC-653 is a vehicular transmitter receiver operating from either 12 o r 24v dc. On 12 volts the battery drain is 42 amperes while on 24 volts the drain is 30 amperes. Transmitter output is over the range of 2 to 4. 5 mc a t a cw power of 50 to 90 watts. Voice power output (AM) is approximately 1/4 of this.
The receiver is the BC-652A and covers the range in two bands.
The transmitter is the BC-653A. The antenna uses mast sections MS-49 to MS-53 inclusive and a base MP-37. A T-17 microphone is used f o r voice. A 200 kc crystal oscillator is built into this equipment to calibrate the transmitter. The receiver u s e s a 915 kc if.
This is 400 lbs of nothing. Actually, it works pretty well but takes the patience of Job to s o r t out the millions of tuning units.
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This equipment is a s i x tube, push-button radio r e c e i v e r designed for portable o r vehicular operation. It is powered by a two volt storage battery, a BB-54-A.
The power supply consists of a vibrator unit complete with a recharger f o r the stgrage cell. The BC-728-A operates over a range of 2 to 6 mc on four preset frequencies chosen by the operators selection of appropriate push buttons.
Button A has a possible range of 2.0 to 2 . 6 mc, button B covers 2 . 6 to 3. 5 mc, button C covers 3.5 to 4. 5 mc, and button D covers 4. 5 to 6 mc. The receiver operates with AM signals and has a n intermediate frequency of 455 kc.
An external whip type antenna, AN-75-A is used with the equipment and a jack is provided for earphone operation when desired. A loudspeaker is normally used with this equipment, and it is mounted within the c a s e of the BC-728-A.
The BC-745, a s m a l l transmitter-receiver known a s the "Horsey-Talkyv1 covers 2-6 nic c r y s t a l controlled. The receiver has an I F a t 455 kc, and the transmitter is grid modulated. Power under 1 watt. Power: Filament, 1. 5 v, Plate, 67 volts receiver; 120 v transmitter
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The BC-906-C is a frequency m e t e r of the absorbtion type. The
BC-906 is housed in a metal c a s e with a door to protect the dial, m e t e r and switches, but which a l s o s e r v e s as a housing f o r the calibration chart and the antenna. In
use the antenna is plugged into the socket located through a hole a t the top of the case. The sensitivity of the m e t e r depends upon the length t o which the antenna is extended and the antenna should be adjusted in length t o maximum sensitivity. The frequency range of the BC-906 is 150 to 225 mc. The detection is accomplished by a diode section of alS5, the pentode section of that tube acting as a m e t e r amplifier.
The required voltages a r e 1. 5 volts f o r the filament, and 45 volts for the plate s U P P ~ Y
This i s the military version of the Hammarlund Super-pro. 455 kc IF.
These receivers normally use a separate power supply, or may be battery operated .Six, 45 volt batteries a r e used, 5 for the plate, 1 for bias. The filament uses a 6 volt battery.
Model C o m m e r c i a l Equivalent Frequency Range
The BC-969A is a superheterodyne receiver covering the VLF band of 15 to 150 kc. The intermediate frequency is 455 kc Power is supplied by an AR-61A supply or a PE-223. It may be operated on any power supply producing 12 volts at 2 amperes and 250 volts at 120 ma dc. The receiver employs a EFO, noise limiter, crystal filter, AVC and uses a VR tube for oscillator stability.
The SCR -300-A, whose major component is the receiver-transmitter BC -1000 -A is a low power, battery operated set. It is primarily designed to b e carried on the back of one man like a knapsack. It operates within the frequency range of 40.0 to 48.0 mc. The t r a n s m i t t e r and receiver both tune to the s a m e frequency
I simultaneously. T h e emission is FM and each transmit channel is 200 kc from the previous one, having been hand calibrated a t the factory. Output is approximately
i one half watt to the antenna. Harmonics of a 4.3 m c c r y s t a l within the equipment a r e used f o r calibration points. T h e equipment employs squelch, AVC and AFC to maintain the t r a n s m i t t e r on frequency. One special note is that during transmit periods the DIAL LIGHT AND CALIBRATE button should not b e depressed. The IF frequency of the receiver is 4.3 m c f o r the f i r s t IF stages, and 2. 5 m c f o r t h e second I F stages, t h e receiver being of the double conversion superheterodyne type.
Power requirements a r e 4.5 volts (filament) a t 0.3 a m p e r e s and 90 volts plate supply a t 25 ma. On t r a n s m i t the requirements a r e 4. 5 volts a t 0. 5 a m p e r e s , 90 volts plate supply a t 25 ma, and 150 volts a t 45 ma. Normally a 90 volt and a 60 volt battery a r e connected in series f o r the transmitter supply In operation a telephone headset o r earphones and lip type microphone a r e used by the operator.
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wThe BC-1206 receiver is a 200 to 400 kc superheterodyne using 28 volts on the filaments and plates. The output is to either low or high impedance headsets. The input is designed to operate on very short antennas such as are generally found in aircraft. The intermediate frequency is 135 kc. The entire receiver is designed for installation on the panel of a plane, the size being 4 by 4 by 6 5{8 inches.
The BC-1335 is a self-contained FM transmitter receiver covering the range of 27 to 38.9 mc. The unit operates on either of two channels, each crystal controlled. One crystal is used per channel. This controls the receiver. The transmitter is monitored by the receiver during transmissions and this causes the transmitter oscillator to be held on frequency by means of a reactance tube across the transmitter oscillator. A carbon microphone such as a T-17 is used with the 1335. The press-to-talk feature of the microphone energizes the transmitter filaments. The receiver output is to a headset. A telephone type handset may be used. The receiver IF is 4.3
mc. The receiver local oscillator is below the signal trl C] frequency and uses the fourth harmonic of the crystal.
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The power supply uses either 6 or 12 volts (neg- ative ground). Provision is made by the input power plug and a switch to select between input voltages. For positive ground vehicles it will be necessary to reverse the high voltage leads going to the synchro- nous vibrator The BC-1335 is manually used with a whip antenna though a coaxial output is also available. Power output is approximately 2 to 4 watts. NOTE CHANNEL SWITCH 5-21, 5-28 5~2C 5-20, AU RESISTOR VALES IN W UlLESS OTHERWIY SPECIFIED 5 ZE, 5 2F. S-2G S-2H, 5-2J 'SHO*IN IN ALL CAWITOR VUUES IN UUF WESS OTHERWIP SPECIFIED 8 POSiTONThe BN is an IFF transmitter receiver operating in the 157 to 187 mc band. It is designed to operate from llOV 60 cycles. Some models may have been modified to 400 cycles by a change in the blower motor only. The receiver is of the super- heterodyne type using a wide band IF covering 28 to 32 mc. The output of the IF is detected and amplified by a video amplifier with a response from 100 cps to 200 kc.
CRC -7
The AN/CRC-7 is a hermetically sealed transceiver with a watertight battery
compartment. Transmission is on MCW o r AM. Originally designed for operation a t 140.58 mc the hermetically sealed portion may be opened and the crystal changed and the coils trimmed to the 2 meter band. The crystal should be in the 18 mc band for multiplication factor of 8 times. The stages should be tuned with the antenna fully extended.
The microphone also s e r v e s as headset on receive. Power is switched by turning the appropriate filament switching. See conversion CQ-A pril '58.
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#PRESSING THE TRAN KEY ALSO DEPRESSES THE R E C KEY.
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The Gibson G i r l transmitter is also known a s the AN/CRT-3 because of its similarity to the cathode ray tube shape. It is a transmitter producing 2 1/2 watts on 500 kc and 2 watts in 8280 kc both of which a r e international d i s t r e s s frequencies. It is normally carried in lifeboats o r with other survival equipment.
In operation it is held between the operator's legs and the hand crank is turned.
A s e r i e s of coded signals used to key the transmitter a r e developed by the crank rotation. A generator i s operated simultaneously to supply filament and plate power to the transmitter. Power is a l s o supplied to a visual lamp for night operation. The antenna is held aloft by either a kite o r a balloon provision being made to generate hydrogen for balloon inflation. Hand keying iS possible.
The DAE is a direction finder. It is a superheterodyne receiver covering the frequency range of 240 to 2000 kc. The input power is 115 volts 60 cps although a c c e s s o r i e s a r e available f o r inputs of 24, 32 o r 115 volts DC.
The direction finder loop is s e p a r a t e from the receiver f o r installations aboard ship. The intermediate frequency is 175 kc. The input is from the loop and s e n s e antenna. The output is to head phones of 600 ohm impedance.
A BFO is provided f o r CW reception, but no AVC is available.
The Wilcox F-3 (ARC -3) r e c e i v e r i s a rack-mounted fixed frequency r e c e i v e r covering the range of 1900 to 16500 kc range. Some models may cover different frequencies from these in standard groups.
Group 1 Group 2 Group 3 Group 4
The F - 3 i s a superheterodyne using a c r y s t a l controlled oscillator and has a 455 kc IF. A V C and a M o r s e s u p p r e s s o r a r e provided.
The GO-9 is a Naval Airforce transmitter for use on sections, the middle one being a power distribution patrol aircraft.. It is rated at 100 watts and covers a section. Input power is llOV 800 cps, and either 12 or frequency range of 300 to 600 kc and 3.0 to 18.1 mc. 24 volts dc. The equipment is constructed in three side-by -side The TBW is very similar to the GO-9.
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The AN/GRR-5 is a mobile radio receiver used f o r tactical purposes. It may be used with its internal speaker, o r with handsets o r other equipment. It covers a frequency range of 1 . 5 mc to 18 mc. It can operate from 6, 12 o r 24 volts dc f o r mobile use, 115 volts 60 cycles f o r fixed use o r from 1. 5 volts a t 350 ma and 90 volts a t 27 m a f o r portable use. It is capable of reception of AM, CUT, MCW.
Provision is made for ten p r e s e t frequencies, although the equipment is capable of continuous tuning. A built in c r y s t a l calibrator supplies a check point every 200 kc. The intermediate frequency is 455 kc.
The equipment is divided into two sections. The r e c e i v e r proper is known a s the Radio Receiver R - ~ ~ ~ / u R R while the power supply is known a s the Power Supply P P - ~ O ~ / U R R .
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The signal generator 1-208 covers the frequencies of 1.90 to 4 . 5 m c and 1 9 m c to 45 mc. It i s used to align FM equipment such a s the BC-603 and BC-683.
The frequency deviation can b e adjusted from 0 to 5 k c on each s i d e of the center frequency of the 1 . 9 to 4. 5 m c band, and from 0 to 50 k c either s i d e of the 19 to 45 mc. Five modulation frequencies a r e provided: 150, 400, 1000, 2500
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A U D I O O S C I L L A T O R U N I T
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