A carrier wave of peak voltage 14 V is used to transmit a message. What should be the peak voltage of the modulating signal in order to have a modulation index of 70%?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9.8 V
The modulation index (m),
$m=\frac{V_m}{V_c}$
M = 70% = 0.7
$⇒V_m=m.V_c$
$=0.7×14=9.8V$