Discussion
What distinguishes narrowband PM from AM despite their similar spectra?
Answer: C
The spectra look alike in magnitude, but the sideband phases differ by a quarter cycle, which is what keeps the PM envelope constant while AM's varies. That single difference changes the detector required, the amplifier class permitted and the noise behaviour. Sideband count and spacing are the same in the narrowband case. And the power comparison depends on how the two are normalised rather than being intrinsically lower. Phase is what separates them, which is a reminder that a magnitude spectrum is an incomplete description.
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