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Define modulation index. Why is its valu...

Define modulation index. Why is its value kept in practies, less than one ?
A carrier wave of frequency 1.5 MHz and amplitude 50 V is moduclated by a sinusoidal wave of frequency 10KHz producing 50% ampitude moducation. Calculate the amplitude of the AM wave and frequencies of the side bands produced.

Text Solution

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Frequency of carrier, ` " " f_(c)= 1.5 MHz = 1500 KHz `
Frequnency of signals,` f_(s) = 10 KHz` Modulation factor M = 50% Amplitude of carrier, ` E_(c) = 50V` The side and ferquency are :
` f_(c) -f_(s) and f_(c) +f_(s)`
(1500 -10) and (1500 +5)
(1490 Hz) and ( 1505 KHz)
Amplitude of each sideband term,
` = (mE_(c))/2= ( 0.5 xx 50)/2 = 1.25 ` V.
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