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Question

Sinusoidal carrier voltage of frequency 1.5 MHz and amplitude 50 V is amplitude modulated by sinusoidal voltage of frequency 10 KHz producing 50% modulation . The lower and upper side-band frequencies in kHz are:


A

1490, 1510

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B

15410, 1490

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C

11490,11510

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D

11490,11520

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Solution

The correct option is A

1490, 1510


Here ,fc=1.5 MHz=1500 kHz,fm=10 kHz

Therefore Low side band frequency

fcfm=1500kHz10kHz=1490kHz

Upper side band frequency

fc+fm=1500kHz+10kHz=1510kHz

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