Discussion
A varactor diode is used in a reactance modulator because
Answer: D
A varactor is a voltage-variable capacitance, so applying the message across it pulls the oscillator frequency in proportion. It is the standard modern reactance element. Rectification is what a detector diode does. Amplitude limiting is a receiver function. And a diode provides no gain. The varactor's simplicity is why direct FM became cheap, and its temperature sensitivity is why the oscillator needs frequency control around it.
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