Determine the modulation index (mf) and carrier swing (S) of an FM carrier having a frequency deviation of 25 kHz and a modulating signal of 5 kHz.

Question

Determine the modulation index (mf) and carrier swing (S) of an FM carrier having a frequency deviation of 25 kHz and a modulating signal of 5 kHz. (A) mf=3 (B) mf=5 (C) mf=8 (D) mf=9

Tardigrade Admin · Accepted Answer

Frequency deviation, Δ f =25 kHz Frequency of modulating signal, fm=5 kHz Modulation index, m f =(Δ f / f m )=(25/5)=5

Q. Determine the modulation index $(m_{f})$ and carrier swing $(S)$ of an FM carrier having a frequency deviation of $25 k Hz$ and a modulating signal of $5 k Hz$ .

$m_{f} = 3$

$m_{f} = 5$

$m_{f} = 8$

$m_{f} = 9$

Frequency deviation, $Δ f = 25 k Hz$
Frequency of modulating signal, $f_{m} = 5 k Hz$
Modulation index, $m_{f} = \frac{Δ f}{f _{m}} = \frac{25}{5} = 5$

Q. Determine the modulation index (mf​) and carrier swing (S) of an FM carrier having a frequency deviation of 25kHz and a modulating signal of 5kHz.

mf​=3

mf​=5

mf​=8

mf​=9