Question

A carrier wave of peak voltage 12 V 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 1

answer : 9V

a/c to question, peak voltage of carrier wave ,$A_c$ = 12V is used to transmit a message signal.

also it is given that modulation index , $\mu$ = 75%

or, we can say modulation index, μ = 0.75 [ in fraction ]

we know, modulation index, $\mu=\frac{A_m}{A_c}$

so, $A_m=\mu A_c$

= 0.75 × 12 = 9V

hence, peak voltage of the modulating signal is 9V.

also read below mentioned question, it is interesting and help you to develop concept about communication system

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