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:
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