Discussion
Two FM systems share a deviation ratio of five but differ tenfold in deviation. They differ in
Answer: C
The noise advantage follows the index, so equal ratios give equal noise performance while the absolute deviation sets the bandwidth, which differs tenfold. That is why narrowband FM voice and wideband FM broadcasting can share a deviation ratio and yet occupy channels of sixteen and one hundred and eighty kilohertz respectively. Saying the ratio determines everything overlooks the absolute scale. And efficiency is unaffected either way, the envelope being constant in both.
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