SHOWCASE 8. CELL 8-23
US Army Radios
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T-74 / CRT-3
("Gibson Girl") - Life-raft transmitter
used for sea rescue purposes, part of AN/CRT-3. Pre-tuned to
the international distress frequencies 500 kHz and 8280 kHz.
A2 only, up to 5 W output. Provisions for both
automatic and manual keying. Manufactured from 1944.
To
be continued after the picture set...
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Powered
by a built-in generator operated by a hand crank. Shaped to fit between the knees
of operator, watertight and capable of floating. With wire antenna 100 m
long raised up by a kite or a balloon operating range was about 300 km to a
rescue aircraft flying at 600 m.
From 1942
there was another rescue radio set, SCR-578 manufactured in
the United States based on
BC-778 transmitter which was capable of operation on 500
kHz only.
The
prototype of BC-778 was German NSG 2 (Notsender 2) of
1941. The BC-778 in turn served as a prototype for Soviet rescue transmitter,
"AVRA-45" of 1945.
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