Westinghouse AN/FPS-27 Radar

The AN/FPS-27 Radar was a Long Range search radar used by the United States Air Force Air Defense Command.

Westinghouse built an FD search radar designed to operate in the S-band at 2322 to 2670 MHz. The radar was designed to have a maximum range of 220 nautical miles and search to an altitude of 150,000 feet.

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.

In the early 1970s, AN/FPS-27 radar stations that had not been shut down received a modification (solid state circuitry replacing vacuum tubes) that improved reliability and saved on maintenance costs.