1.

The audio signal having frequency 500Hz and voltage 2.6V, shows a deviation of 5.2KHz in a Frequency Modulation system. If the audio signal voltage changes to 8.6V, calculate the new deviationobtained. a. 17.2 KHz b. 19.6 KHz c. 25.6 KHz d. 14.6 KHz

Answer»

a. 17.2 KHz 

Deviation in FM is given by Δf = kf * Am

Therefore, kf = Δf/ Am

= 5.2/2.6= 2

When voltage changes to 8.6V = Am

New frequency deviation Δf = kf * Am

= 2* 8.6= 17.2 KHz



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