Filter
Top Products
51
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 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
VFO 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.
Notes: • To cancel the adjusted threshold level, press key.
• The adjusted threshold level for the current frequency can be set back to the
default value by pressing and holding the key.
• When you change the Sound Quality it affects all other APCO 25 signals in that
same band. (UHF, VHF, or 800MHz).
.
.
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