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The transmitter-receiver combination in the satellite is known as a _______

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The transmitter-receiver combination in the satellite is known as a _______

(a) Relay

(b) Repeater

(c) Transponder

(d) Duplexer

I have been asked this question during an online interview.

This intriguing question originated from Satellite Communication Systems in chapter Satellite Communication of Avionics

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Right answer is (c) Transponder

Explanation: The transmitter-receiver combination in the satellite is known as a transponder. The basic functions of a transponder are amplification and frequency translation. The reason for frequency translation is that the transponder cannot transmit and receive on the same frequency.

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