Discussion
Why is a pulse-width modulated supply used in large AM transmitters?
Answer: C
Switching the supply and filtering the result produces the modulated voltage the output stage needs with switching-mode efficiency rather than a linear audio amplifier of comparable power. It is why modern high-power AM broadcast transmitters are far smaller than their predecessors. The oscillator and the output tuned circuit are both still required. And the carrier is retained, this being full-carrier AM. Replacing a linear stage with a switching one is the same move that transformed power supplies generally.
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