Discussion
As the modulation index falls well below one, the FM bandwidth approaches
Answer: A
In the narrowband limit the bandwidth tends to \( 2f_m \), exactly as for AM, because only the first pair of sidebands carries appreciable power. That is why narrowband FM occupies a channel comparable with AM's and why it is used for voice radio. Twice the deviation is the wideband approximation. The deviation alone is never the bandwidth. And half the message frequency is less than the message needs. The two limits of Carson's rule are worth knowing separately, since they bracket every practical case.
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