REPEATER AVAILABLE TONES FOR CONVENTIONAL SCAN EQUIPPED REPEATERS
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-21
A conventional repeater programmed with multiple channels has the capability of scanning for receiver activity between programmed channels. The scanning process looks for receive activity on each of the channels listed in a preprogrammed scan list by checking for the presence of carrier on each channel and optionally for the subaudible signalling, PL or DPL, on each channel. Whenever activity is detected on a channel, the scanning activ- ity stops and repeater services are only rendered to users on that channel. Users on the other channels have temporarily lost access to the repeater. Because the repeater is locked on the channel where activity was first detected, the repeater has no way of notifying users on the other channels, who may wish to use the repeater, that the repeater is not currently available for use.