1.
Deviation ratio
= maximummodulatingfrequencymaximumallowabledeviation
=1575
=5
2.
Frequency deviation =Am kf
Where Am = modulating frequency
kf= frequency sensitivity
Frequency deviation = 12×9
108kHz
3.
Modulating index=modulatingfrequencyfrequencydeviation
= 6.710
=1.4925
4.
Percentage modulation= allowabledeviationactualfrequencydeviation
=225×100%
=22.73%
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