Discussion
Why is a limiter still useful in a PM receiver?
Answer: C
Because PM's envelope is constant at the transmitter, any amplitude variation at the receiver is noise or fading and can be discarded, exactly as in FM. That is why the limiter belongs to the whole angle family rather than to FM alone. It performs no conversion. The index is a transmitter parameter that no receiver stage restores. And the phase ambiguity is resolved by a reference or by differential coding, not by limiting. Most errors on this topic come from carrying a result across from a neighbouring scheme where it does not hold.
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