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Discussion :: Communication Systems

  1. A message signal with bandwidth 10 kHz is lower sideband SSB modulated with carrier frequency fc1 = 106 Hz. The resulting signal is then passed though a narrow band frequency modulator with carrier frequency fc2 = 109 Hz. The bandwidth of the output would be

    2. A.
    4 x 104 Hz
    B.
    2 x 106 Hz
    C.
    2 x 109 Hz
    D.
    2 x 1010 Hz

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    Answer : Option B

    Explanation :

    Bandwidth = 2Δf + 2B

    But for NBFM, B < 1

    BW ≈ 2fm 2fc1 2 x 106 Hz.

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