Discussion
Which modulator gives FM directly?
Answer: A
A reactance modulator pulls an oscillator's tuned circuit with the message and so varies the frequency directly, which is the simplest route to large deviation. A balanced modulator with a filter produces single sideband. Collector modulation is high-level amplitude modulation. And a detector cannot be run backwards as a modulator in any useful sense. Matching each modulator to the quantity it varies is the quickest way through a transmitter diagram.
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