OVERVIEW: The AN/FPS-20 is a fixed early warning and ground-controlled interception radar system operating in the D Band
DETAILS: The FPS-20's were simple pulse-radar systems and subject to jamming using basic techniques.
Frequency: 1250 to 1350 MHz (D Band) Power output: 6 KW (average); 2.5 MW (peak) PRF: 350 Hz Range Resolution: 1.85 km (range), 1 degree (azimuth) On/Off time: unknown Deploy/Stow Time N/A Max Range: 322 km
NOTES: IOC 1956. The radar family started with the AN/FPS-3 in 1950. By the late 1950s, this radar dominated the US radar defense network, with deployment continuing into the early 1960s. Later updates largely improved ECCM capabilities and were designated AN/FPS-64, AN/FPS-65, AN/FPS-66, AN/FPS-67, AN/FPS-91, AN/FPS-93, AN/FPS-100, AN/FPS-113, AN/GPS-4, and AN/FPS-508.