Reflection Module 07 (201-33-5321,A) by md selim - Tuesday, 31 August 2021, 11:22 PM Number of replies: 0 F.M. ( Frequency modulation ) : The frequency of carrier wave is varied in proportion to the modulating signal waveform.P.M. ( Phase modulation ) :The phase of carrier wave is varied in proportion to the modulating signal waveform. Permalink