Figure 1(b) shows a snap shot time domain display of an FM signal, together with themessage from which it was derived. The frequency change is large compared with theunmodulated output frequency, and the carrier frequency is only four times that of themessage. So this waveform is not a typical one. But it can be reproduced with TIMS.Note particularly that there are no amplitude variations - the envelope of an FM waveform isa constant.experiment
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