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  4. Find the modulation index of an AM wave having 8 V variation where maximum amplitude of the AM wave is 9 V.

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Q. Find the modulation index of an AM wave having $8 V$ variation where maximum amplitude of the AM wave is $9 V$.

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Solution:

Modulation index: $m=\frac{A_m}{A_c}$
Given $2 A_m=8$
$ A _{ m }+ A _{ c }=9 \Rightarrow A _{ c }=5$
$ \therefore m =\frac{4}{5}=0.8$