March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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to apply filtering to the signal. This should not introduce any undue distortion. To achieve this
it is normally necessary to allow a bandwidth equal to twice the maximum frequency of
deviation plus the maximum modulation frequency. In other words, for a VHF FM broadcast
station with a deviation of 75 kHz and a maximum modulation frequency of 15 kHz, this
must be (2 75) þ 15 kHz, i.e. 175 kHz. In view of this a total of 200 kHz is usually allowed,
enabling stations to have a small guard band and their centre frequencies on integral numbers
of 100 kHz.
Improvement in signal-to-noise ratio
It has already been mentioned that FM can give a better signal-to ...
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