Discussion
Which single fact explains most of the differences between FM and PM?
Answer: A
Everything else follows from it: because FM's index carries a division by the message frequency and PM's does not, their bandwidths scale differently, their detector noise spectra differ, and pre-emphasis becomes necessary for one and pointless for the other. Both have constant envelopes. Both have infinitely many sidebands. And FM is routinely generated indirectly, by the Armstrong method. Tracing a family of differences back to one root is the most compact way to hold this topic.
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