| 摘要 |
<p>A trunked radio system comprises a controller and a plurality of radio units. The controller is operable as a repeater providing a plurality of channels for communication between the radio units. The controller also has the task of allocating channels as traffic channels 136 for traffic between radio units. In the process of allocating a traffic channel, the controller identifies a CTCSS tone on the allocated channel. Preferably the controller identifies a CTCSS tone to the radio units for use during the call by transmitting the tone on the traffic channel 144. At least some of the radio units may comprise a non-predictive CTCSS decoder.</p> |
