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What is Carrier swing?

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What is Carrier swing?

(a) Frequency deviation

(b) Width of sideband

(c) Instantaneous frequency

(d) Total variation in frequency

This question was posed to me in an interview for job.

My enquiry is from Transmitter topic in chapter Elements of Communication System of Analog Communications

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Correct choice is (d) Total variation in frequency

To elaborate: Carrier swing is defined as the total variation in frequency from the lowest to the highest point. It is equal to twice the frequency deviation of FM signal. The rest of the options are parameters in FM.

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