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

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

Option A is the Correct answer.

Explanation: Given,

Deviation in FM Δf = kf `\times` `"A"_"m"`

`\therefore` kf = Δf/ Am = `"5.2"/"2.6"` = 2

When voltage changes to 8.6V = `"A"_"m"`

New frequency deviation Δf = kf `\times` `"A"_"m"`

= 2 `\times` 8.6= 17.2 KHz