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Which modulation is used by a microwave system?

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Which modulation is used by a microwave system?

(a) FM

(b) SSB

(c) QAM

(d) Either FM or SSB or QAM

I got this question in an international level competition.

This is a very interesting question from Frequency Translation topic in portion Modulation of Analog Communications

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Right choice is (d) Either FM or SSB or QAM

The explanation is: Microwave system is used for point-to-point communication links, which is the communication between two nodes. It can either use frequency modulation or single sideband modulation or quadrature modulation.

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