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Communication Systems - Engineering

Q1:

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

A Armstrong modulator

B Varactor diode modulator

C Reactance FET modulator

D Reactance bipolar transistor

ANS:A - Armstrong modulator

FM is generated by two methods: 1st is Direct method which is known as parameter variation method and other one is Indirect method which is called as Armstrong method, in this the crystal oscillator is used as carrier frequency generator.