Discussion
Why does frequency multiplication raise the modulation index?
Answer: D
Multiplying the signal multiplies its instantaneous phase, and hence the phase deviation, by the same factor as the carrier frequency, so a small index at low frequency becomes a usable one at the operating frequency. Bandwidth grows rather than narrows, in proportion. The message is untouched, being already embedded in the carrier. And the carrier survives multiplication. This is the mechanism that makes indirect generation practical, and it applies to both angle schemes.
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