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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
1510,1490
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C
11490, 11510
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D
11510, 11490
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Solution

The correct option is A 1490,1510
Here, fc = 1.5 MHz = 1500 kHz, fm =10 kHz
Low side band frequency=
fc−fm = 1500 kHz−10 kHz
= 1490 kHz
Upper side band frequency=
fc+fm = 1500 kHz+10 kHz
= 1510 kHz

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