Question

In RF tuning, _________ provides the final up conversion to the microwave frequency?

(a) Fixed-frequency local oscillator

(b) RF frequency synthesizer

(c) Quartz oscillator

(d) Magnetic oscillator

The question was posed to me in class test.

My query is from Ground Stations topic in section Satellite Communication of Avionics

Answer 1

Correct answer is (b) RF frequency synthesizer

For explanation I would say: In RF tuning, a mixer fed by a fixed-frequency local oscillator performs an initial up conversion to 700 MHz. Then a sophisticated RF frequency synthesizer applied to a second mixer provides up conversion to the final microwave frequency.