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Which of the following is an indirect way of generating FM?

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Which of the following is an indirect way of generating FM?

(a) By reactance modulator

(b) By bipolar transistor

(c) By varacter diode

(d) By armstrong modulator

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The origin of the question is Applications of SSB in portion SSB Modulation of Analog Communications

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The correct answer is (d) By armstrong modulator

Explanation: Armstrong modulator which is the only way for indirect generating of frequency modulation.

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