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This study reviews the analysis of the output autocorrelation function and spectral density for two CW signals which are passed through a hard limiter, describes the experimental results for two CW signals passed through a TWT, and analyzes the output autocorrelation function and spectral density for two FM signals, four CW signals, and four FM signals passed through a hard limiter. The principal analytical result shows that the output spectrum of multiple FM signals has the properties of multiple CW signals, as far as the centers of the cross-modulation spectrum are concerned, and the properties of narrowband Gaussian signals as far as the spectrum spreading is concerned, although the mechanism by which the spectral spreading occurs is different. The principal engineering result is the channel spacing for two, three, and four FM signals which will yieldnegligible third- and fifth-order crosstalk, when the input signals are passed through a hard limiter or TWT. The analysis of the output autocorrelation function and spectral density for an angle modulated signal when passed through a limiter is a contribution of the author.