Discussion
Which statement about PM and FM bandwidths at a fixed index is correct?
Answer: D
At a given index and message frequency the two bandwidths are computed identically, because the Bessel structure is shared; the schemes differ in how the index itself is arrived at. Neither is uniformly larger once the index is fixed. And PM bandwidth certainly does depend on message frequency, in direct proportion. The distinction to hold is that the difference lies in the index, not in the formula that turns an index into a bandwidth. A single measurement chosen to respond to the one asymmetry beats several that respond to shared behaviour.
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