If fm is modulating frequency and mf is modulation index, then by the Carson's rule, the bandwidth of an FM signal at the input of a conventional discriminator will be:

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If fm is modulating frequency and mf is modulation index, then by the Carson's rule, the bandwidth of an FM signal at the input of a conventional discriminator will be:

33) If f_m is modulating frequency and m_f is modulation index, then by the Carson's rule, the bandwidth of an FM signal at the input of a conventional discriminator will be:

1. 2 f_m (m_f +1) Hz [Option ID = 2961]
2. 2 f_m (m_f -1) Hz [Option ID = 2962]
3. f_m (2m_f +1) Hz [Option ID = 2963]
4. f_m (2m_f -1) Hz [Option ID = 2964]

Answer: A

Solution

As per Carson's law the bandwidth of FM is 2*fm(mf+1)

where, fm is message frequency; mf = modulation index

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