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The SCR-277 was a mobile, trailer mounted radio range set for radio guidance of 
TM 11-487
Technical Manual. Electrical Communication Systems Equipment, 2 October 1944
SCR and BC lists
US Army Fort Gordon Military Museum Military radio systems of the United States Military electronics of the United States Air traffic control Radio navigation Surveying Wireless locating Equipment of the United States Air Force World War II American electronics Military equipment introduced from 1940 to 1944 {{Tech-stub
aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engine ...
. It was standardized by the U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
in June 1941.
Specifications
The SCR-277 was used as a navigation aid. It included the BC-467transmitter
In electronics and telecommunications, a radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. The transmitter itself generates a radio frequency alternating current, which is applied to the ...
with an RF output power of 800 watt
The watt (symbol: W) is the unit of power or radiant flux in the International System of Units (SI), equal to 1 joule per second or 1 kg⋅m2⋅s−3. It is used to quantify the rate of energy transfer. The watt is named after James ...
s, the BC-468 Goniometer, and BC-342 receiver. Frequencies utilized were 200-400 kHz for transmission and 1.5-18 MHz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose expression in terms of SI base units is s−1, meaning that one he ...
for reception. Radio range homing equipment transmitted tone identification signals to aircraft that lacked a radio compass but were equipped with command sets. Range was approximately 300 miles. It was powered by a single PE-90 generator.
Use
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" signal. Over land areas the beacon has 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.See also
* Low Frequency radio range * Signal Corps Radio *List of U.S. Signal Corps vehicles
This is a list of vehicles used by the U.S. Army Signal Corps from World War I through World War II.
Designations
Vehicles specifically designed or adapted for the Signal Corps were initially designated by a "K" number. The K-number was later ph ...
* List of U.S. military vehicles by supply catalog designation (G705)
* Radio navigation
Radio navigation or radionavigation is the application of radio frequencies to determine a position of an object on the Earth, either the vessel or an obstruction. Like radiolocation, it is a type of radiodetermination.
The basic principles a ...
* LORAN
LORAN, short for long range navigation, was a hyperbolic radio navigation system developed in the United States during World War II. It was similar to the UK's Gee system but operated at lower frequencies in order to provide an improved range u ...
* SHORAN
* Lorenz beam
References
General references
* TM 9-2800 Standard Military Motor Vehicles. dated 1 September 1943 * TM 9-2800 Military vehicles dated October 1947 * TM 11-227 Signal Communication Directory. dated 10 April 1944External links
TM 11-487
Technical Manual. Electrical Communication Systems Equipment, 2 October 1944
SCR and BC lists
US Army Fort Gordon Military Museum Military radio systems of the United States Military electronics of the United States Air traffic control Radio navigation Surveying Wireless locating Equipment of the United States Air Force World War II American electronics Military equipment introduced from 1940 to 1944 {{Tech-stub