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A tracking horn-reflector antenna, a maser preamplifier (or standby parametric preamplifier), and a special FM demodulator were combined to form a low-noise receiving system which was used to achieve a high-quality voice circuit via the Echo I passive satellite. This paper describes the 2390-MC receiving system located at Holmdel, New Jersey.
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E. A. Ohm (1961) studied this question.
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