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Purpose:
SCR-536/BC 611
is a hand held radio in the 80-m-Band. Its appearance is well-known
to everyone, who saw one of the many films on D-Day. In the end of WW II it
played an important role in shortrange connection.
The distances are amazing that can be still be covered
today despite small performance and an antenna with very small efficiency.
There are no more heating or plate batteries, there are, however,
plans for transducers.
One channel (out of 50) can be chosen by replacing crystals and coils , stored in the box BX-49.
Realignment and fine tuning can only be made by maintenance personell.
The radio comes in versions A,B,C,D,E,and F. Versions A to E have the same schematics.
A "Bottom Cover Asembly" can be attached to Version F, thus providing the radio with a jack for
external headset and a jack for an external microphone.
It was replaced by PRC-6.
Special features:
The radio is switched on/off by uncollapsing the antenna,
There is no loudness knob,
There is no squelch.
SCR-585-A / SCR-585-B
is the slightly changed glider - version.
The radio itself is called BC-721-A or BC-721-B, und
it is placed on the mounting FT-295-B.
The PTT is operated by a control shaft (MC-355 or MC-365-B) ,
depending on the type of glider.
The Radio Control Box BC-722-B provides the electrical connections. It contains :
two jacks for headphones, one jack for a throat microfone, an on/off switch, a volume control and
a microphone matching transformer.
While used in a glider, two headphones (for pilot and co-pilot) can be used, but only one throat microphone.
On one side of
the radio, there is the PTT switch, above that there is a small
sliding door. The radio fits into the mounting
with this side down. The sliding door needs to be open, and
in the bottom of the mounting there is a pin that goes into a hole behind the
sliding door. This pin presses on a recessed switch which disconnects
the BC-721 telescoping antenna from the electronics, and connects the
glider antenna.
The radio can be unbuckled and taken out of the mounting. It can be used as a normal
"Handy Talkie ©". It is switched on like the BC-611 by uncollapsing the antenna; and there is no
volume control any more.
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Radio Set SCR-585-B
(Components)
[<= click]
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BC-611 is a "Squad Radio", a small hand held unit for very local communications. The
collection shows all American Squad radios from their beginning (1941) to 1986. ==>
You may also read the article by Alan Tasker :
"U.S. Military Portable Radios"
- Frequency range:
3,5... 3.6 MHz
Technical data :
- Channel spacing / number of channels:
- 40 kHz, 1 channel.
- Channels possible:
- 50
- Transmitting power
- 360 mW (the TM says 36 mW : a misprint)
- Frequency control
- Crystal
- Modulation:
- AM
- Sensitivity,
- 3 to 5 µV
- Tubes:
- 5
- Range:
- over land 1 mile
- over salt water 3 miles
- Antenna:
- collapsible rod antenna
- Batteries, Voltages, Consumption
- Filament battery BA-37, 2 x (parallel), 1.5V, Receiving: 250 mA, Transmitting: 300 mA
- Anode battery BA-38, 103.5V, Receiving: 11 mA, Transmitting: 35 mA
- Hand set
- built in
- Developed
- 1942
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WS-38
SCR-511/BC745)