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A carrier wave of peak voltage $10 \mathrm{~V}$ is used to transmit a message signal. What should be the peak voltage of the modulatingsignalinordertohaveamodulationindex of $80 \%$
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$8 \mathrm{~V}$
$\begin{aligned} & \mathrm{m}=\frac{\mathrm{A}_{\mathrm{m}}}{\mathrm{A}_{\mathrm{c}}} \Rightarrow 0.8=\frac{\mathrm{A}_{\mathrm{m}}}{10} \\ & \Rightarrow \quad \mathrm{A}_{\mathrm{m}}=8 \mathrm{~V}\end{aligned}$
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