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The SCR-277 was a mobile, trailer mounted radio range 
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 History of 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
set
Set, The Set, SET or SETS may refer to:
Science, technology, and mathematics Mathematics
*Set (mathematics), a collection of elements
*Category of sets, the category whose objects and morphisms are sets and total functions, respectively
Electro ...
for radio guidance of aircraft
An aircraft ( aircraft) is a vehicle that is able to flight, fly by gaining support from the Atmosphere of Earth, air. It counters the force of gravity by using either Buoyancy, static lift or the Lift (force), dynamic lift of an airfoil, or, i ...
. It was standardized by the U.S. Army
The United States Army (USA) is the primary land service branch of the United States Department of Defense. It is designated as the Army of the United States in the United States Constitution.Article II, section 2, clause 1 of the United Stat ...
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 (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna (radio), antenna with the purpose of sig ...
with an RF output power of 800 watt
The watt (symbol: W) is the unit of Power (physics), 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 quantification (science), quantify the rate of Work ...
s, the BC-468 Goniometer
A goniometer is an instrument that either measures an angle or allows an object to be rotated to a precise angular position. The term goniometry derives from two Greek words, γωνία (''gōnía'') 'angle' and μέτρον (''métron'') ' me ...
, and BC-342 receiver. Frequencies utilized were 200-400 kHz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base uni ...
for transmission and 1.5-18 MHz
The hertz (symbol: Hz) is the unit of frequency in the International System of Units (SI), often described as being equivalent to one event (or cycle) per second. The hertz is an SI derived unit whose formal expression in terms of SI base u ...
for reception. Radio range homing equipment transmitted tone identification signals to aircraft that lacked a radio compass
Direction finding (DF), radio direction finding (RDF), or radiogoniometry is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an inadvertent source, a naturall ...
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
Signal Corps Radios were U.S. Army military communications components that comprised "sets". Under the Army Nomenclature System, the abbreviation SCR initially designated "Set, Complete Radio", but was later misinterpreted as "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 ...
* List of U.S. military vehicles by supply catalog designation (G705)
* Radio navigation
Radio navigation or radionavigation is the application of radio waves to geolocalization, determine a position of an object on the Earth, either the vessel or an obstruction. Like radiolocation, it is a type of Radiodetermination-satellite servi ...
* LORAN
LORAN (Long Range Navigation) was a hyperbolic navigation, hyperbolic radio navigation system developed in the United States during World War II. It was similar to the UK's Gee (navigation), Gee system but operated at lower frequencies in order ...
* SHORAN
SHORAN is an acronym for SHOrt RAnge Navigation, a type of electronic navigation and bombing system using a precision radar beacon. It was developed during World War II and the first stations were set up in Europe as the war was ending, and was op ...
* 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 History of 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