Description of the radar set, tactical-technical characteristics
Figure 1: AN/FPS-31 and AN/FPS-6 heightfinder (left)
Figure 1: AN/FPS-31 and AN/FPS-6 heightfinder
MIT’s Radiation Laboratory
|frequency:||420 … 430 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):||300 Hz (± 10 Hz)|
|pulsewidth (τ):||6 µs|
|peak power:||2 MW|
|average power:||3.6 kW|
|instrumented range:||250 NM (≙ 460 km)|
|hits per scan:|
|antenna rotation:||6 rpm|
AN/FPS-31 was operating in UHF-Band Ground-controlled Interception (GCI) radar that was a part of the Experimental SAGE Subsector (ESS). A prototype only was operational in the test site West Bath in Maine (43°54'07.0" N 69°50'43.0" W) in October 1955. The site was closed in November 1962. The tower is still used as a mobile phone mast.
The antenna’s reflector was 120 feet wide and 16 feet high. The transmitter was a liquid-cooled magnetron of type QK508 built by Raytheon.
- William W. Ward and F. Robert Naka ''Long-Range UHF Radars for Ground Control of Airborne Interceptors'', Lincoln Laboratory Journal, Volume 12, Number 2, 2000, S.209