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Which part of the transmitter subsystem modulates the baseband signal?

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Which part of the transmitter subsystem modulates the baseband signal?

(a) Antenna

(b) Up converter

(c) Power amplifiers

(d) Mixer

This question was addressed to me during a job interview.

My doubt stems from Ground Stations topic in section Satellite Communication of Avionics

1 Answer

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The correct option is (b) Up converter

To elaborate: The transmit subsystem consists of two basic parts, the up converters and the power amplifiers. The up converters translate the baseband signals modulated on to carriers up to the final uplink microwave frequencies.

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