Discussion
Which practical difficulty does a large PM index create at the modulator?
Answer: C
A practical modulator's phase shift is linear only over a fraction of a radian, so a large index distorts unless the index is built up by frequency multiplication afterwards. That constraint is exactly why the Armstrong transmitter exists in the form it does. Carrier amplitude is held constant by design. Bandwidth always depends on the index. And limiting at the receiver is unaffected by the transmitter's index. The parameter that varies and the parameter that does not are worth naming before any substitution is attempted.
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