University of Illinois 400ft Antenna
The University of Illinois radio telescope compiled a catalog of faint extragalactic radio sources. It was a 400 x 600 foot cylindrical parabolic reflector made by covering a shaped-earth excavation with asphalt and wire screen. A catwalk at 155 feet above the ground supported about 400 conical log-spiral antennas along the focal line. Scanning in one plane was achieved by the Earth’s rotation; in the other plane by physically rotating the circularly polarized spirals.
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