Discussion
What is the spacing between adjacent FM sidebands?
Answer: D
Sidebands sit at multiples of the message frequency either side of the carrier, so their spacing is that frequency regardless of the index. The index controls their amplitudes rather than their positions, which is a distinction the Bessel expansion makes precise. Deviation sets how far out significant energy extends. Half the message frequency and the index-scaled figure appear in no standard result. Positions from the message, amplitudes from the index, is the pairing to remember.
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