Q.

A message signal of frequency 10 kHz and peak voltage of 10 volts is used to modulate a carrier of frequency 1 MHz and peak voltage of 20 volts. The side bands are 1010 kHz and______________kHz.

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answer is 990.

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Detailed Solution

Here, vm=10kHz,Am=10Vvc=1 MHz=1000 kH z, Ac=20 VModulation index, μ=AmAc=1020=0.5 The side bands are USB=vc+vm=1000+10=1010 kHzLSB=vc−vm=1000−10=990 kHz
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