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FM Radios of WWII by Alan Tasker, WA1NYR Around 1940, a frequency allocation plan was implemented that carried through WWII and into the next generation of equipment after that. This plan was as follows. Armour, 20-27.9 MHz Artillery, 27-38.9 MHz (c1950, Infantry was officially assigned 38-55 MHz). A low power series of transceivers (i.e. both Rx and Tx in one box), sometimes called "Jeep radios," were developed, and a high power series of transmitters with companion receivers were also developed (sometimes called "Tank" sets). Later, the BC-1000 came along for the infantry (SCR-300) and for use in tanks and other vehicles (AN/VRC-3). Low Power Series (1-1.5 Watt Tx power output) The BC-620  covered 20-27.9 MHz while theBC-659  covered 27-38.9 MHz,
both in 100 kHz steps. These could be powered by dry batteries using
CS-79 (SCR-509 and SCR-609 respectively), or installed in vehicles using
the PE-120 power supply (SCR-510 and SCR-610 respectively). Later, the SCR-619/BC-1335  was developed to replace the somewhat
problematical BC-659. It could be used portably with CH-291 (early
models)(contained three ea BB-54 2 Volt batteries) or CY-740/PRC (late
models)(contained BA-70 dry battery). When installed in a vehicle, it
employed two ea CH-291 and a PE-219 battery charger (early models), or
ran directly to the battery for 6 V or 12 V operation (late models) (or
with DY-44 for 24 V operation). The BC-1335 employed miniature tubes like
those used in the BC-1000. Representative of this series of equipment is
the unit pictured below.High Power Series (20 Watts Tx power output) The following hardware was developed for high power capability in order to increase the communication range. BC-603 receiver, 20-27.9 MHz BC-604 transmitter, 20-27.9 MHz BC-683 receiver, 27-38.9 MHz BC-684 transmitter, 27-38.9 MHz This equipment was supplied different ways as follows. SCR-508, two ea BC-603 Rx plus one ea BC-604 Tx plus BC-605 interphone SCR-528, one ea BC-603 Rx plus one ea BC-604 Tx plus BC-605 interphone SCR-538, one ea BC-603 Rx plus one ea BC-604 Tx plus one ea BC-605 interphone SCR-608, two ea BC-683 Rx plus one ea BC-684 Tx plus BC-605 interphone SCR-628, one ea BC-683 Rx plus one ea BC-684 Tx plus BC-605 interphone Representative of this series is the BC-603 and the BC-604 shown below. (Pictures of BC-620 and BC-659 courtesy of Horst-Dieter Tiemann, www.surplusradio.de ) |
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Updated: Feb 27 2004 |
| Type Army |
Picture (only radio itself) |
Brief description | Completeness and condition |
| WSB44MK3
English  DETAILS |
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mobile
60..75 MHz, 3 Watts 3 Channels |
2x only radio
Condition fair, |
| BC-603
USA DETAILS |
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Receiver
28..38 MHz, WW II |
1x radio
no accessories |
| BC-604
USA DETAILS |
 |
Transmitter
28..38 MHz, WW II |
1x radio
no accessories |
| BC-1335
USA DETAILS |
 |
mobil
28..28.9 MHz, 1936 1 W FM |
1 x radio
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