SCR-277
TheSCR-277was a mobile, trailer mountedradio rangesetfor radio guidance ofaircraft.It was standardized by theU.S. Armyin June 1941.
Specifications[edit]
The SCR-277 was used as a navigation aid. It included the BC-467transmitterwith anRFoutput power of 800watts,the BC-468Goniometer,andBC-342receiver.Frequencies utilized were 200-400kHzfor transmission and 1.5-18MHzfor reception. Radio range homing equipment transmitted tone identification signals to aircraft that lacked aradio compassbut were equipped withcommand sets.Range was approximately 300 miles. It was powered by a single PE-90 generator.[1][2][3]
Use[edit]
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.[3]
See also[edit]
- Low Frequency radio range
- Signal Corps Radio
- List of U.S. Signal Corps vehicles
- List of U.S. military vehicles by supply catalog designation(G705)
- Radio navigation
- LORAN
- SHORAN
- Lorenz beam
References[edit]
- ^"DIRECTORY OF SCR ITEMS".US Army Fort Gordon.US Army. Archived fromthe originalon February 5, 2009.Retrieved9 January2019.
- ^George Raynor Thompson; Dixie R. Harris (1966).The Signal Corps: the outcome (mid-1943 through 1945).Office of the Chief of Military History, U.S. Army. pp. 652–.
- ^ab"Graphic Survey of Radio and Radar Equipment"(PDF).Walt Gromov's Radio Museum.Army Air Forces, Air Technical Services Command.Retrieved9 January2019.
General references[edit]
- 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 1944
External links[edit]
- TM 11-487Technical Manual. Electrical Communication Systems Equipment, 2 October 1944
- SCR and BC listsUS Army Fort Gordon Military Museum
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- Military radio systems of the United States
- Military electronics of the United States
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