Question:
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 = 12V
Modulation index m = 75% = 0.75
Amplitude of the modulating wave = Am
Using the relation -
m = Am/Ac
Am = m x Ac
Am = 12 x 0.75
Am = 9V.
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