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Which of the following transponders convert the uplink signal to downlink signal using two mixers

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Which of the following transponders convert the uplink signal to downlink signal using two mixers

(a) Single conversion transponders

(b) Dual conversion transponders

(c) Regenerative transponders

(d) Dual mixer transponder

I got this question in quiz.

The query is from Satellite Subsystems in portion Satellite Communication of Avionics

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Correct choice is (b) Dual conversion transponders

The best I can explain: A dual-conversion transponder makes the frequency translation in two steps with two mixers. No demodulation occurs.

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