July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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118
ω
d
= 2πf
d
= deviation in radians
ω
m
= 2πf
m
= modulating frequency in radians
The ‘deviation ratio’, D, is given by:
D =
f
d(max)
f
m(max)
The peak deviation is the maximum amount of modulation occurring
(equivalent to 100% amplitude modulation). With FM, this is limited
only by the need to conserve spectrum; there is no technical limit
where distortion occurs, as with 100% AM. The maximum permitted
deviation for a service is determined by regulation.
The bandwidth of a frequency modulated signal is made up of the
carrier and a series of sidebands, sometimes referred to as sidecurrents,
spaced apart from each other at the modulating frequency. The
number of
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