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Question: Answered & Verified by Expert
A carrier wave of peak voltage $15 \mathrm{~V}$ is used to transmit a message signal. If the modulation index is $60 \%$, then the peak voltage of the modulating signal is
PhysicsCommunication SystemAP EAMCETAP EAMCET 2023 (15 May Shift 1)
Options:
  • A $3 \mathrm{~V}$
  • B $6 \mathrm{~V}$
  • C $9 \mathrm{~V}$
  • D $12 \mathrm{~V}$
Solution:
2288 Upvotes Verified Answer
The correct answer is: $9 \mathrm{~V}$
The peak voltage for the modulating signal is
$\mathrm{m}=\frac{\mathrm{A}_{\mathrm{m}}}{\mathrm{A}_{\mathrm{C}}} ; \mathrm{A}_{\mathrm{m}}=\mathrm{mA}_{\mathrm{C}}=0.60 \times 15=9 \mathrm{~V}$

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