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________ modulator is an indirect way of generating FM.

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________ modulator is an indirect way of generating FM.

(a) Varactor FET

(b) Reactance FET

(c) Armstrong

(d) Reactance bipolar transistor

The question was asked during an interview.

This intriguing question comes from Comparison Between PM and AM in chapter Noise of Analog Communications

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Correct choice is (c) Armstrong

The explanation: FM can be generated in two ways. One is direct and other is indirect way. In indirect way, there is an Armstrong method which is used to generate FM system, while other methods stated in the options are direct ways.

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