Discussion
What is the narrowband condition for phase modulation?
Answer: C
Narrowband PM requires an index well below one radian, in which case only the first sideband pair matters and the bandwidth approaches twice the message frequency, as in AM. The deviation condition is the FM form of the same idea. A high carrier is assumed throughout and is not what defines the regime. And a large index is the wideband case. Both angle schemes have the same two regimes, distinguished by their own index. The shared properties explain why these schemes form a family, and the differences explain why more than one exists.
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