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Which of the following is an indirect way of generating frequency modulated signals?

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Which of the following is an indirect way of generating frequency modulated signals?

(a) Armstrong modulator

(b) Varacter diode modulator

(c) Reactance FET modulator

(d) Reactance modulator

I have been asked this question in an online interview.

My question is from Phase Shift Method topic in division SSB Modulation of Analog Communications

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Best answer
Correct option is (a) Armstrong modulator

To explain: Varacter diode modulator is not an indirect way of generating FM. Instead it’s a direct way of producing FM with the help of voltage controlled oscillator mechanism. It is Armstrong modulator which is an indirect way of generating FM.

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