Antenna closeup, northwest face (1982).
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Each of the four phased array antennas contained more than 5,000 array elements, was 13 feet in diameter, and weighed over 400,000 pounds.
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The radar could continue to function even after the loss of some of the individual array elements.
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The smaller antenna array located to the lower right of the main array was the Q-channel antenna. Its purpose was to reject or "blank" signals received on the array sidelobes (portions of the antenna response pattern not contained in the main beam).
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The pipes and nozzles around the perimeter of the antennas were the antenna washdown devices. Their purpose was to wash and/or de-ice the antenna face/elements with a cleaning/de-icer solution.
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The white plug-like device to the lower left of the main array was the exterior control for the antenna wash system.
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Description from Clint Esckilsen and ABM R & D at Bell Labs.