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  4. In an amplitude modulation with modulation index 0.5, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

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Q. In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is

KEAMKEAM 2012Communication Systems

Solution:

Modulation index $=0.5 =\frac{1}{2}$
$ A_{\text {side band }} =\frac{\mu A C}{2} $
$ \frac{A_{\text {side band }}}{A C} =\frac{\mu}{2}=\frac{1}{4} $
or $ \frac{A C}{A_{\text {side band }}} =\frac{4}{1} $