Comments on "Spectral Properties of Single-Sideband Angle Modulation

It is noted that the essential results published by Mazo and Salz were previously disclosed and obtained using simple and direct Fourier transform computer techniques. When comparing the rms bandwidth of this system with the analogous double-sideband spectrum on the basis of equal modulating signal strength in the two systems, the bandwidth crossover point is actually lower than the value stated by Mazo and Salz. However, when comparing the two systems on the basis of equal relative sideband power, the bandwidth of SSB angle modulation is always less than conventional angle modulation.