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In Rf tuning, what is the first local oscillator?

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In Rf tuning, what is the first local oscillator?

(a) Quartz oscillator

(b) Frequency synthesizer

(c) Magnetic oscillator

(d) Electric oscillators

The question was asked in homework.

I need to ask this question from Ground Stations topic in chapter Satellite Communication of Avionics

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Right choice is (b) Frequency synthesizer

Easiest explanation: In RF tuning, the first local oscillator is made adjustable. Generally, a frequency synthesizer is used in this application. The frequency synthesizer generates a highly stable signal at selected frequency increments.

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