MIT AN/CPS-4 Radar

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File:AN-CPS-4 Radar.jpg
AN/CPS-4 Radar
Type Medium-Range Height Finding
Frequency 2700 to 2900 MHz

The AN/CPS-4 Radar was a Medium-Height Finding Radar used by the United States Air Force Air Defense Command.

Developed by MIT's Radiation Laboratory, this height-finding radar was nicknamed "Beaver Tail." The radar was designed to be used in conjunction with the SCR-270 and SCR-271 search sets. The CPS-4 required six operators. This S-band radar, operating in the 2700 to 2900 MHz range, could detect targets at a distance of ninety miles. The vertical antenna was twenty feet high and five feet wide. This radar was often paired with the AN/FPS-3 search radar during the early 1950s at permanent network radar sites.


 This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency.

  • AN/CPS-4 @
  • Winkler, David F. (1997), Searching the skies: the legacy of the United States Cold War defense radar program. Prepared for United States Air Force Headquarters Air Combat Command.