The Frequency Diversity Radar program was a major radar developmental program at Air Force Rome Air Development Center [RADC]. Some of the prototypes developed as part of it included the AN/FPS-26. This equipment was designed to succeed existing Semi-Automatic Ground Environment (SAGE) radar systems, which had served as the backbone of air defense of the CONUS, in order to provide enhanced electronic counter countermeasures (ECCM) capability. Avco Corporation built this height-finder radar that operated at a frequency of 5400 to 5900 MHz. On 20 January 1960, after testing, RADC accepted the AN/FPS-26 air defense radar from AVCO, the contractor, stipulating that the contractor must correct certain component deficiencies. This radar deployed in the 1960s.
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