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Discussion :: Communication Systems

  1. A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 1 kHz. If the single tone frequency is increased to 2 kHz, assuming that phase deviation remains unchanged, the bandwidth of the PM signal is

    2. A.
    21 kHz
    B.
    22 kHz
    C.
    42 kHz
    D.
    44 kHz

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    Answer : Option D

    Explanation :

    Frequency deviation = 10 kHz, fm = 1 kHz

    2(fm + Df)

    Bandwidth = 22 kHz

    2(10 + 1) 22 kHz

    fm is doubled

    Hence 22 x 2 44 kHz bandwidth.

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