Discussion
What happens to the carrier component of a PM signal as the index rises?
Answer: A
The Bessel behaviour is shared with FM, so the carrier weakens as power moves into the sidebands and vanishes at particular indices before returning. Growth would violate the constancy of total power. Staying constant is the AM behaviour, where the carrier is fixed and the sidebands are added on top. And the nulls are isolated points rather than a permanent disappearance. The carrier nulls are as useful for calibrating a PM index as they are for an FM deviation.
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