Discussion
Automatic frequency control in an FM transmitter compares the oscillator with
Answer: A
The loop mixes the modulated oscillator down against a crystal reference and feeds the error back to hold the centre frequency, with a time constant long enough not to cancel the wanted modulation. That last detail is the subtle part of the design. Deviation is set by the modulator's sensitivity. Power control is a separate loop. And no transmitter has access to a distant receiver's oscillator. The loop lets a drifting oscillator behave like a crystal-controlled one.
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