Question:
The Modulating frequency in narrow band frequency modulation is increased from 10 kHz to 20 kHz. The bandwidth is
The Modulating frequency in narrow band frequency modulation is increased from 10 kHz to 20 kHz. The bandwidth is
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The bandwidth of a narrow band FM signal is proportional to the modulating frequency. Thus, bandwidth is increased when the modulating frequency is doubled.
Updated On: Feb 10, 2025
- Doubled
- Halved
- Increased by 10 kHz
- Decreased by 10 kHz
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The Correct Option is A
Solution and Explanation
In a narrowband FM, the bandwidth (BW) is approximately twice the modulating frequency (\(f_m\)):
\[
BW \approx 2f_m
\]
If \(f_m\) is increased from 10 kHz to 20 kHz, the bandwidth will be doubled from 20 kHz to 40 kHz.
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