Discussion
Which amplifier class suits an FM output stage?
Answer: A
Class C is ideal, because FM's envelope is constant and amplitude distortion therefore costs nothing, so efficiency can be pushed high. The three linear classes are needed only where an envelope must be preserved, as in single sideband. That freedom is one of FM's practical advantages over the amplitude family, alongside its noise performance, and it is why an FM transmitter of given output runs cooler than an SSB one. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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