Q.

A sinusoidal carrier voltage of 80 volts amplitude and 1 MHz frequency is amplitude modulated by a sinusoidal voltage of frequency 5 kHz producing 50% modulation. Calculate the amplitude and frequency of lower and upper side bands

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a

10 V, 990 kHz, 995 kHz

b

20 V, 995 kHz, 1000 kHz

c

20 V, 995 kHz, 1005 kHz

d

10 V, 990 kHz, 1005 kHz

answer is C.

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Detailed Solution

Amplitude of both LSB and USB are equal =mEc2=0.5 x 802=20 V Now,   frequency of LSB  = fc−fm=1000−5kHz=995kHz  frequency of USB  = fc+fm=1000+5kHz=1005kHz
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