Operating Manual

6-20 5100 ES Models II/III Portable Radio Operating Manual March 2008
SMARTNET / SmartZone / P25 Trunked Features
6.13.7.3 P25 Wide Area Scan
A feature called Wide Area Scan can be programmed to minimize the problem just
outlined. This feature is programmed on the Talk Group list screen selected on the P25
System screen. When Wide Area Scan is selected, talk group site preferences are no longer
available. However, System Site Preference lists can still be used. The Wide Area Scan
feature functions as follows:
1 Assume TG1 is selected. If it is the first time this talk group is selected, normal
searching for a control channel occurs according to the hunt methods previously
described.
2 When another talk group is selected, the active valid site for TG1 is stored in EEPROM
memory.
3 The next time TG1 is selected, the following procedure is performed before performing
the normal hunt methods previously described.
a The last valid site ID and its receive and transmit channel numbers are loaded from
EEPROM memory.
b The dynamic site list is checked to see if any newer receive/transmit channel
information is available for the last site ID.
c The best receive/transmit information is used and the radio checks to see if this
control channel is available.
The result of the preceding operation is that the radio has a reasonable chance of finding a
valid site, usually on the first try. This greatly reduces access time, even on systems which
have highly restricted talk group based access.