Uniden UBC396T - Manual (Page 104)

102
Optimizing P25 Performance
Optimizing P25 Performance You can optimize the scanner’s performance with digital
APCO 25 systems. Follow these steps for each system
where you can hear APCO 25 traffic.
Notes:
• These steps work only when you can clearly
receive the system. If you are in a weak-signal
area or receive interference, these steps will not
work. These steps do not compensate for weak
signals or signals subject to interference.
• If you set an incorrect decode threshold level in Step
5, the scanner might stop decoding all digital signals
in the system. If this happens, change the setting to
a value between 8 and 12 then repeat these steps.
1. Make sure the system's P25 Level option is set to
Auto
(see “Adjusting the P25 Level (Motorola and
Conventional Systems Only)” on Page 81).
2. Hold on an active digital channel on the system.
3. While holding down , briefly press the scroll
control twice. The next to last line on the display
now shows the digital error rate and the AUTO
decode threshold start level (0-20). The last line
on the display shows the decode threshold levels
for the system.
4. Allow the scanner to monitor channel activity for
several minutes. The error rate should drop for each
transmission and the threshold levels should auto-
matically adjust to a more optimal setting. Then,
once the threshold level settles to a stable setting,
make a note of the values. This is the system's
optimum decode threshold.
5. While holding down , rotate the scroll control
to set the AUTO decode threshold start level to a
setting that most closely matches the system's
optimum decode threshold. Now, when the scanner
stops on a system, it will use this threshold as the
starting point for automatic optimization.
6. While holding down , briefly press the scroll
control to exit this mode.
Func
Func
Func
Optimizing P25 Performance