Intermodulation noise in V.H.F. multichannel telephone systems

This paper considers the noise which is introduced into the individual channels of a multichannel telephone system (frequency division multiplex) during transmission over a v.h.f. f.m. radio system due to various forms of distortion in the radio system. Formulae and curves are given for the computation of noise levels in systems of up to 60 channels and methods of measuring the parameters used in these formulae are discussed.