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When two or more frequency modulated signals are transmitted simultaneously through a nonlinear device, intelligible crosstalk from one signal to another is a potential problem. Such a situation arises in connection with the multicarrier use of satellite transponders. In this paper, intelligible crosstalk arising from transmission vs frequency deviations followed by amplitude-to-phase (AM-PM) conversion is considered. The AM-PM conversion characteristics of the transponder are represented by a single constant coefficient determined through a simple measurement technique. Crosstalk ratios for an arbitraryNcarrier system are derived and experimental verification is presented for the two-carrier case.
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Chapman et al. (1964) studied this question.
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