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An FM transmitter transmits with a rated system deviation of 60 kHz and
a maximum modulating frequency of 15 kHz. If the carrier amplitude is 25
V, determine the number of side frequencies required to ensure that 98%
of the power is contained in the carrier and side frequencies. Sketch
the spectrum diagram.
The frequency deviation is given by:
It will be seen that only J2 , J3 , J4 ,
J5 and J0 are required:
This is a considerable saving in bandwidth and hence a reduction in
noise in the modulator circuits.
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