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Optimizing P25 Performance
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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.
• 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 79).
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
automatically 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.
Notes:
Optimizing P25 Performance