Radio Navigation Equipment - Signalspaning.se
Radio Navigation Equipment - Signalspaning.se
Radio Navigation Equipment - Signalspaning.se
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<strong>Radio</strong> Set SCR-578 is a simple, rugged emergency<br />
transmitting system designed for operation from a<br />
life raft. No receiving equipment is incorporated in the<br />
<strong>se</strong>t. The <strong>se</strong>t provides automatic code transmission of predetermined<br />
signals so that any operator, with or without<br />
training, can <strong>se</strong>nd distress signals which, when received<br />
by rescue parties, will permit bearings to be taken. The<br />
<strong>se</strong>t operates on the international distress frequency of 500<br />
kc. with a 1000-cycle tone modulation.<br />
It may be u<strong>se</strong>d as a hand-powered signal light<br />
with manual keying to transmit instruction, or as a con.stant<br />
signal light. If the signal light is u<strong>se</strong>d, no radio transmission<br />
takes place.<br />
Various models of the transmitter differ only in<br />
details of electrical or mechanical design. AKite M-357-A<br />
and two Balloons M-278-A are provided to rai<strong>se</strong> the antenna.<br />
The kite is a collapsible box kite measuring 17"x 1 7 "x 36"<br />
inches as<strong>se</strong>mbled. It will fly in wind of 7 to 40 miles per<br />
hour velocity. The balloon is u<strong>se</strong>d when lack of wind does<br />
not permit the u<strong>se</strong> of the kite. It is inflated by means of a<br />
hydrogen generator to approximately four feet diameter.<br />
Power for the operation of the equipment is obtainedfrom<br />
ahand generator, which is a part of the equipment.<br />
This equipment is to be super<strong>se</strong>ded by a dual<br />
frequency radio <strong>se</strong>t AN/CRT-3. Army Supply Program requirements<br />
for the two equipments as of 1 December 1944<br />
were 40,742 equipments for the calendar year 1944 and<br />
55,025 for 1945.<br />
TUBE COMPLEMENT<br />
NO. TYPE NO. TYPE<br />
1 12SC7 1 12A6<br />
J .; t iA<br />
SCR-578<br />
<strong>Radio</strong> Transmitter 778-E<br />
POWER SUPPLY HAND GENERATOR<br />
POWER OUTPUT 2.5 WATTS (PEAK<br />
FREQUENCY 500 KC<br />
TYPE OF SIGNAL TONE<br />
RANGE 200 MILES,RAFT TO<br />
AIRPLANE<br />
Principal ude of <strong>Radio</strong> Set SCR-bI8 is toprovideair crews forced down over water with a means of transmitting<br />
an international distress signal from liferafts. It is automatically'keyed to transmit the signal andis<br />
powered by a hand-driven generator.<br />
May 1945
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