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A 1000 KHz carrier is modulated with 800 Hz audio signals. What are the frequencies of first pair side band?

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A 1000 KHz carrier is modulated with 800 Hz audio signals. What are the frequencies of first pair side band? 

(A) 1000 KHz and 800 Hz 

(B) 800 Hz and 999.2 KHz 

(C) 1000.8 KHz and 999.2 KHz 

(D) 1000.8 KHz and 1000 KHz

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Best answer

The correct option is (C) 1000.8 KHz and 999.2 KHz.

Explanation:

fc = 1000 KHz 

fm = 800 KHz = 0.8 KHz 

First pair of sideband will occur at fc ± fm Hz 

∴ frequencies will be (1000 ± 0.8) KHz i.e. 1000.8 KHz and 999.2 KHz.

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