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frequncy modulation

Discussion in 'Electronic Basics' started by prad, Apr 24, 2006.

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  1. prad

    prad Guest

    hi in fm the frequency of the wave is continiously changing then how is
    fm frequency measured ?
    is it the frequency of the carrier wave ?
  2. Phil Allison

    Phil Allison Guest


    ** A surprisingly simple and insightful question.

    The "frequency" of an FM modulated wave = the *average frequency* !!!

    There is a fixed carrier frequency that becomes apparent when there is NO
    modulation - ie silence in a broadcast program. FM modulation shifts this
    BASE frequency UP & DOWN about the centre frequency.

    When averaged over a reasonable time interval ( say one second) the average
    frequency is the same as the BASE frequency.

    ........ Phil
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