A method of double-frequency modulation suitable for long-distance transmission of multichannel signals by means of radio-relay stations is described. Propagation, radio-frequency bandwidth, and radio-frequency power are discussed briefly. The signal-to-noise ratio and distortion of the system are shown by theory and experiment. An experimental circuit between Philadelphia and New York is described and the results are given.
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L.E. Thompson (1946) studied this question.
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