Title :
Investigation of Frequency-Modulation Signal Interference
Author_Institution :
Formerly, Colonial Radio Corporation, Buffalo, N.Y.; now, Syracuse University, Syracuse, N.Y.
Abstract :
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.
Keywords :
Amplitude modulation; Frequency modulation; Interference; Phase modulation; RF signals; Radio transmitters; Resonance; Shape; Signal analysis; Signal design;
Journal_Title :
Proceedings of the IRE
DOI :
10.1109/JRPROC.1947.231929
