Q. 54.7( 6 Votes )

A carrier wave of peak voltage 12V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75%?

Answer :

Amplitude of the carrier wave, Ac = 12 V

Modulation index, m = 75% = 0.75 (unitless as a ratio)


Amplitude of the modulating wave = Am


We know for modulation index:


m = Am/Ac


Am = mAc


Am = (0.75 × 12) V = 9V


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