Question

In an FM Broadcast, the maximum frequency deviation allowed is 75 kHz and the maximum modulation frequency is 15 kHz. The bandwidth is closest to

• A. 180 kHz
• B. 60 kHz
• C. 105 kHz
• D. 120 kHz

Hint:

Use Carson’s Rule: $BW = 2(\Delta f + f_m)$ for FM signal bandwidth calculations.

Answer 1

The Correct Option is A

The bandwidth of an FM signal is calculated using Carson’s Rule: \[ BW = 2(\Delta f + f_m) = 2(75 + 15) = 180 \text{ kHz} \] Where: $\Delta f$ = frequency deviation = 75 kHz, $f_m$ = maximum modulation frequency = 15 kHz.