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About: Mills Cross Array     Goto   Sponge   NotDistinct   Permalink

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The Mills Cross Array, or the 96-acre antenna array, was a Mills Cross Telescope-style radio telescope located in Seneca Maryland, near Washington, D.C. Constructed in June, 1954, it was operated by the Carnegie Institution of Washington. The full array consisted of two arms, each 2047 feet in length with 66 dipole antennas. The dipole antennas were supported by unpainted wooden poles, connected with wires. The telescope had around 5 miles (8.0 km) of wire, with an army surplus truck housing the phase-switching radio receiver. It was built to conduct a 22.2 MHz (13.5 meter) sky survey, and at that frequency it had a beam about 2.5 degrees wide.