FPS-90

FPS-90 Long Range Height Finder Radar Set - A Long Range Height Finder Radar set developed at RADC and built by General Electric. The FPS-90 was a long range, high power, air transportable, height finding radar used in conjunction with a long range search radar set. The basic components for the FPS-90 came from the FPS-6, FPS-6A and FPS-6B. The differences with the FPS-6 series were: Removal of the variable nod functionality in the FPS-6B models. Replacement of the magnetron with a higher power QK-338A magnetron. The FPS-90s (and FPS-6s) were used in the SAGE System to provide height data for targets selected by the direction center. The direction center would preposition the height-finder through the FST-2 and an operator would verify the target and transmit the correct altitude back to the direction center. The Range Height Indicators (RHI) of the FPS-90 were used to find the target and a cursor would be positioned at the correct altitude. FPS-90 Height Finder Radar FPS-90 Height Finder Radar Element Value Notes Nomenclature FPS-90 Origins AN/FPS-6 Variants FPS-507 Manufacturer General Electric Type Height Finder Number Made IEEE Band S Band Frequency 2700 - 2900 MHz PRF 300-400 pps Pulse Width 2 to 3 usec Rotation Speed Variable Power 4.5 MW peak power Range 220 nmi Long Range Altitude 75,000 feet Elevation Accuracy +/- 1000 ft. Introduced FPS-6 Radar Set Antenna on Tower. See Also: FPS-6 FST-2 US Radar Sets Sources: Winkler, David F., Searching the Skies: the Legacy of the United States Cold War Defense Radar Program, USAF Hq Air Combat Command, 1997, 192 pages, Pdf. MIL-HDBK-162A, 15 Dec 1965. Links: FPS-90