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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16 Signalling
Many radio receivers are required to respond to instructions sent to
them over the radio channel to which they are tuned. Several methods
of signalling these instructions are in use, from the continuous tones
used for controlling the receiver mute operation to the rapid data
to initiate channel changes and transmitter power control on cellular
radio-telephones.
16.1 Sub-audio signalling
The slowest signalling system uses continuous sub-audio frequency
tones. Known as continuous tone controlled signalling (previously
squelch) system (CTCSS) its performance, in the UK, is specified
in Radiocommunications Agency specification MPT 1306. The most ...
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