Discussion
Which is true of narrowband PM's spectrum?
Answer: B
At small index only the first sideband pair matters, giving a spectrum that looks like AM's three lines but with the sidebands in phase quadrature rather than in phase. That similarity is why narrowband angle modulation occupies a channel comparable with AM's. Sidebands are certainly present. A wideband spectrum has many more significant pairs. And the spacing is the message frequency in every case.
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