Discussion
What limits how narrow an intermediate frequency filter can usefully be?
Answer: B
A filter narrower than the signal removes part of the signal along with the noise, so the useful limit is the signal's own occupied bandwidth - a few hundred hertz for Morse, a few kilohertz for speech. Audio stability is unrelated. Crystal quality factors permit far narrower filters than are wanted. And gain is not the constraint. The matched filter rather than the narrowest filter is optimal, and that holds for every kind of receiver.
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