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Q.

A signal of frequency  20 kHz and peak voltage of  5V is used to modulate a carrier wave of frequency  1.2 MHz and peak voltage  25V choose the correct statement regarding amplitude modulation

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a

modulation index =5 , side band frequencies are at 1400kHz and 1000kHz

b

modulation index =5 , side band frequencies are at 21.2kHz and 18.8kHz

c

modulation index =0.8 , side band frequencies are at 1180kHz and 1220kHz

d

modulation index =0.2 side band frequencies are 1220kHz and 1180kHz

answer is D.

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Detailed Solution

GivenFrequency of signal  fm=20 kHzPeak voltage  Am=5 VFrequency of carrier wave  fc=1.2 MHzPeak voltage AC= 25 VModulation index  =AmAc=525=0.2Lower side band frequency  fLSB=fc−fm=1200−20=1180 kHzUpper side band frequency  fUSB=fm+fc=1200+20=1220 kHz
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