Amateur Extra › E7 Practical Circuits › E7E01
E7E01
Which of the following can be used to generate FM phone signals?
Pick an answer to check it.
Answer: B. Reactance modulation of a local oscillator
FM can be made by using a reactance modulator to vary the frequency of an oscillator with the audio. It is done at the oscillator, not the final amplifier, since the frequency must be set where it is generated.
Tip: FM: wiggle the oscillator's reactance.