AP EAMCET20228 Jul 2022Evening ShiftPhysicsCommunication SystemActual
A carrier wave of peak voltage 60 ~V is used to transmit a message signal. Then the peak voltage of the modulating signal in order to have a modulation index of 90 % is
Options
- A30 ~V
- B54 ~V
- C45 ~V
- D60 ~V
Correct answer
B. 54 ~V
Step-by-step solution
Modulation index, = Amplitude of message A_M Amplitude of carrier A_C here, =90 %= 9 10 and A_C=60 ~V 9 10 = A_M 60 A_M= 9 60 10 =54 ~V So peak voltage of modulating signal is 54 ~V .