File:RSI test.jpg

CHILL antenna and positioning system undergoing pre-delivery tests at manufacturer’s test facilities in approximately early 1971. Three equipment boxes near the base of the pedestal housed control equipment used with the motor-generator sets that drove the four 9 HP, low inertia motors in the antenna drive system (two motors on each motion axis). The feed horn could operate at either horizontal or vertical polarization. As built by RSI, the horn support struts lay in the H and V polarization planes. RSI built a second, identical antenna system that NCAR used for the Grover Radar (subsequently renamed CP2) used in NHRE. (Photograph from Gene Mueller’s files.)