Discussion
What would you expect of an FM signal received at exactly the threshold level?
Answer: D
At threshold the output is noticeably noisy but still usable; a little above it the noise falls away rapidly and a little below it the output collapses. That sharp transition is what the threshold effect names, and it makes FM coverage boundaries abrupt compared with AM's gradual fade. Perfect reception needs a margin above threshold. Silence comes well below it. And adjacent-channel reception is a selectivity failure rather than a threshold phenomenon.
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