Discussion
Why does the FM carrier amplitude fall as modulation increases?
Answer: B
Total power is constant, so whatever appears in the sidebands must come out of the carrier, and at some indices the carrier vanishes entirely. Output power does not fall; that is the whole point of the constant-envelope property. The limiter is a receiver stage. And deviation does not cancel anything; it redistributes energy according to the Bessel functions. This redistribution is the clearest way to see why FM power arithmetic differs so sharply from AM's.
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