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Principle of Superposition

A carrier wav...

Question

A carrier wave of peak voltage $14 V$ is used for transmitting a message signal. The peak voltage of modulating signal given to achieve a modulation index of $80$ % will be:

A

11.2 V

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B

7 V

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C

22.4 V

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D

28 V

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Solution

The correct option is A $11.2 V$
Since $M o d u l a t i o n I n d e x = \frac{V_{m}}{V_{c}}$

$V_{m}$ = Modulating Signal Voltage
$V_{c}$ = Carrier Signal Voltage

$0.8 = \frac{V_{m}}{14}$

$V_{m} = 11.2 V$

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