Owner`s manual

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.

• 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