• Source: AN/FPS-27

      • The AN/FPS-27 Radar was a long-range early warning radar used by the United States Air Force Air Defense Command.
      Westinghouse Electric Corporation built a frequency diverse (FD) search radar designed to operate in the S-band from 2322 to 2670 MHz. The radar was designed to have a maximum range of 220 nmi (410 km; 250 mi) and search to an altitude of 150,000 ft (46,000 m).
      System problems required several modifications at the test platform located at Crystal Springs, Mississippi. Once these problems were solved, the first of twenty units in the continental United States became operational at Charleston, Maine, in 1963. The last unit was installed at Bellefontaine, Ohio, a year later. All AN/FPS-27 radars were installed at sites which had AN/FPS-6, AN/FPS-26, or AN/FPS-90 height finder radars. The 3-D functionality of the AN/FPS-27 was not available to the AN/FYQ-47 Common Digitizer for use in the Semi-Automatic Ground Environment (SAGE) system.
      The 3-D functionality was possible through the use of a "vertically stacked beam" radiating feedhorn into the parabolic reflector. The received radar return was detected in a single or adjacent feedhorn which the radar receiver calculated a relative position in elevation.
      In the early 1970s, AN/FPS-27 radar stations that had not been shut down received a modification (solid state receiver circuitry replacing vacuum tubes) that improved reliability and saved on maintenance costs. The upgraded radars were designated AN/FPS-27A.
      In accordance with the Joint Electronics Type Designation System, the radar's "AN/FPS-27" designation represents the 27th design of an Army-Navy fixed radar(pulsed) electronic device for searching.


      References


      This article incorporates public domain material from the Air Force Historical Research Agency


      See Also



      List of radars
      List of military electronics of the United States


      External links


      Radomes.org - AN/FPS-27, 27A
      FAS.org - AN/FPS-27

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