Discussion
An engineer must halve an FM channel's width without changing the audio bandwidth. The available move is
Answer: D
Bandwidth is dominated by the deviation term, so reducing the deviation narrows the channel and lowers the index, which costs noise performance - the trade run in reverse. Lowering the audio level does reduce deviation, but only for that programme and not as a system change; the deviation limit is what defines the channel. Carrier frequency does not affect bandwidth. And pre-emphasis and de-emphasis are a matched pair, not alternatives.
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