Calculation of frequency deviation in Frequency Modulation

Q.  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 deviation obtained.
- Published on 14 Oct 15

a. 17.2 KHz
b. 19.6 KHz
c. 25.6 KHz
d. 14.6 KHz

ANSWER: 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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