Discussion
What is the practical benefit of a phase-locked loop's linearity?
Answer: C
Its output follows frequency linearly by construction, so distortion is low and stays low without any tuned-circuit alignment to drift. Image rejection depends on the preselector. Passband width is set by the intermediate filters. And co-channel behaviour is the capture effect, common to any limiting FM receiver. Replacing an adjustment with a topology that needs none is the same argument that favours synthesisers over pulled oscillators in transmitters.
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