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Question

A carrier wave of peak voltage 15 V is used to transmit a message signal. Find the peak voltage of the modulating signal in order to have a modulation index of 60%.


Solution

Peak voltage of carrier wave, Ec = 15 V.
              Modulation index, m = 60% =0.6
Peak voltage of modulating signal, Em= ? 
Since, modulation index, m = EmEc
hence,                Em=mEc=0.6×15=9V

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