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Investigation of Frequency-Modulation Signal Interference

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1 Author(s)
Plusc, I. ; Formerly, Colonial Radio Corporation, Buffalo, N.Y.; now, Syracuse University, Syracuse, N.Y.

The cause and mechanism of interference between two frequency-modulation signals are analyzed. It is shown that, while the interference of two frequency-modulation signals on the same channel is practically independent of receiver design, off-channel interference depends on the shape of discriminator curve beyond 120 kilocycles off resonance. Methods are developed to calculate the amount of interference for a given receiver, in terms of the relative strength of the interfering signal. Receiver design modifications, which will reduce the amount of interference from different channels, are indicated.

Published in:

Proceedings of the IRE  (Volume:35 ,  Issue: 10 )