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UBCD396XT
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When the user releases the PTT button, the controller releases the voice frequency
from its Talk Group ID assignment, leaving the frequency free for the next user
that becomes active.
A real life example
A typical 20-frequency trunked system can support hundreds of channels. For
example, the Fort Worth system includes over 400 channels providing
communication support for Fort Worth agencies (Police, Fire and Ambulance) and
agencies in the surrounding cities of Kennedale, North Richland Hills, Forest Hill,
Haltom City and Richland Hills. In addition, the same system also supports the
Tarrant County Sheriff and Texas Christian University.
Before moving to the trunked system, the Police had only 6 channels (North,
South, East, West, Information, and Tactical). Since moving to the trunked system,
they are now able to provide 11 channels for North Side PD alone: a main dispatch
channel, three talkaround channels, a supervisor channel, a bike patrol channel, and
several community patrol channels. Other police districts have similar channel
requirements, and now special operations teams such as SWAT, Narcotics, and
Traffic each have one or more dedicated channels for their use as well.