Discussion
Why can an FM transmitter use a class C output stage?
Answer: B
The constant envelope means amplitude distortion carries no penalty, so the output stage can run in the efficient class C mode that a varying-envelope signal like SSB forbids. That efficiency is one of FM's practical advantages alongside its noise performance. Bandwidth is wide rather than narrow. The carrier is present throughout. And the deviation being small relative to the carrier is true but irrelevant to amplifier class. Constant envelope is the property to remember, since it also underlies the limiter's usefulness.
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