56
Programming APCO 25
Systems
To program an APCO 25 system, follow the steps in the
appropriate section for conventional or Motorola Trunking.
APCO 25 systems require only 1 additional setting: Sound
Quality.
Setting APCO 25 Sound Quality
Each APCO 25 system has slightly different system settings
that control how the audio is digitized. To get the best sound
quality, you need to match as closely as possible the system’s
settings.
To adjust the sound quality:
1. While monitoring a specific APCO P-25 talkgroup, press
the
HOLD/MAN
key.
2. Press and hold the
9
key. On Line 1 of the screen you will
see
SOUND QULTY: 0050
(for example). This shows
the Sound Quality. The lower the level the better the
Sound Quality.
3. To manually set the sound quality, rotate the scroll bar up
or down. As the threshold adjusts in increments of 100 at
the bottom of the screen watch the Sound Quality level
increase or decrease and continue to rotate the scroll bar
until you have achieved the best Sound Quality level.
Notes:
• When APCO P-25 signal is not received,
SOUND
QULTY: ****
appears on the display.
• You must be receiving an APCO P-25 signal to
make this adjustment
A chart showing the Threshold Adjustment Range is listed
below.
4. Once you have adjusted the Sound Quality to the best
possible level, press
E
.
Press
RSM
to exit the Sound Quality Adjustment Mode.
Lower
Mid
Upper
Band
Min
Default
Max
Default
Min
Default
Max
800MHz
33
533
1833
1985
2042
3342
3842
UHF
33
633
1833
1985
2042
3342
3842
VHF
330
930
2130
2147
2264
3464
4064
BC296D(NEW) 10/16/03 6:35 PM Page 56
