Discussion
Which comparison of PM against AM is correct?
Answer: C
PM's power is constant and its envelope carries nothing, whereas AM varies its power with modulation depth and puts the whole message in the envelope. Only AM among the two carries envelope information. Full-carrier AM famously needs no coherent detection, which is its chief advantage, so the last option is wrong for AM. Setting the angle family against the amplitude family on these two axes - power constancy and where the information lives - organises the whole subject.
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