Discussion
Why does an FM receiver need a wider intermediate frequency passband than an AM set?
Answer: C
A broadcast FM signal occupies about 200 kHz against an AM channel's 10, so the filter must be wide enough to pass it undistorted. Detector selectivity is not a meaningful property here, oscillator drift is comparable, and gain control is unaffected by bandwidth. The passband always follows the signal's occupied width, which is why the FM standard also puts the intermediate frequency far higher: a 200 kHz filter at 455 kHz would be impossible.
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