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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