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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12
Noise is produced in every electronic component. Shot noise – it
sounds like falling lead shot – caused by the random arrival of elec-
trons at, say, the collector of a transistor, and the random division of
electrons at junctions in devices, add to this noise.
Doppler effect
Doppler effect is an apparent shift of the transmitted frequency which
occurs when either the receiver or transmitter is moving. It becomes
significant in mobile radio applications towards the higher end of the
UHF band and on digitally modulated systems.
When a mobile receiver travels directly towards the transmitter
each successive cycle of the wave has less distance to travel ...
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