Calculation of Modulation index in FM signal

Q.  A 100MHz carrier is frequency modulated by 10 KHz wave. For a frequency deviation of 50 KHz, calculate the modulation index of the FM signal.
- Published on 15 Oct 15

a. 100
b. 50
c. 70
d. 90

ANSWER: 50
 
Carrier frequency fc = 100MHz
Modulating frequency fm = 10 KHz
Frequency deviation Δf = 500 KHz
Modulation index of FM signal is given by
mf = Δf/fm
= 500 * 103/ 10 * 103
= 50

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    Discussion

  • vikas   -Posted on 30 Mar 17
    answer is 5
  • dithendra yarram   -Posted on 19 Sep 16
    In a problem it is mentioned that maximum devation is 50KHz but in solution it is considered as 500KHz.So,Please correct the same

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