Radio Navigation Equipment - Signalspaning.se

Radio Set SCR-277 is a mobile ground radio range
transmitter used to set up ranges at regular intervals along
air routes to provide beacon facilities for navigation of
aircraft from point to point. The equipment is mounted in
a trailer type K-29-C, to provide portability.
In operation the transmitter sends out signals
coded "A" or "N" in each of the four quadrants around
the beacon. The signals overlap on the range, providing
the pilot of the aircraft an indication of his position in relation
to location of the beacon. Thus, if he is heading
toward the beacon he will receive an aural signal coded
"A" or "N" if he is between the beam, and when he is on
the beam he will receive an "AN" signal. Overland areas
the beaconhas a range of about 300 miles, while over water
areas the range is extended to about 1,000 miles. Charts
prepared for air navigation show the position and the orientation
of the various beacons.
Power for operation of the equipment is furnished
by a gasoline driven power unit that provides 7.5
kilowatts at 115 volts and 500 cycles per second, and two
six volt storage batteries.
Test equipment required for maintenance includes
Tool Equipment TE-60 and Test Set 1-77.
Army Supply Program requirements as of 1 February
1945 were 11 equipments for the calendar year 1945.
TUBE COMPLEMENT
NO. TYPE NO. TYPE
2 6C5 2 807
1 6F6 1 814
4 6K7 1 -128-A
1 6L7 1 5A3
1 6R7 2 866/866A
1 5W4 2 872-A
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SCR-277
Radio Range SCR-277 set up for operation.
POWER INPUT 7.5 KW@110 VOLTS
POWER OUTPUT 810 WATTS
FREQUENCY 200-400 KC.
TYPE OF SIGNAL CW: W
RANGE LAND-300 MILES;
WATER-bOOMILES
ANTENNA CROSSED LOOPS 70
______________FEET HIGH
Radio Set SCR-277 is a portable low frequency 1oop radio range - providing a 4 course range with facilities for
voice transmission and periodic station identification.
Nay 1945