Discussion
The Armstrong method generates FM indirectly by
Answer: B
Armstrong's method phase modulates a crystal-controlled carrier at low level, then multiplies the frequency to raise the small deviation to the value needed. It gives excellent stability because the crystal is never pulled. Varactor pulling is the direct method it replaces. Amplitude modulation followed by limiting produces a constant-amplitude signal with no frequency deviation. And mixing translates frequency without modulating it.
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