Transmit Deviation Limit Reference; Signaling Deviation - Motorola MCS 2000 Service Instructions Manual

Transmit
Deviation Limit
Reference
Note
Signaling
Deviation
DTMF Transmit
Deviation
This procedure is only required for VHF and UHF models with
Note
20 kHz and 12.5 kHz channel spacing.
These softpots set the deviation reduction ratio to transmit at 20 kHz or 12.5
kHz channel spacing.
1. Press F6 to select the TRANSMIT DEVIATION LIMIT 12.5/20 kHz softpot.
2. With Test Box RLN4460A: With the meter selector switch set to MIC,
inject a 1 kHz tone on the AUDIO IN terminal on the test set, 400
mVrms as measured on the AC/DC MTR port.
With Test Box GTF180B: With the meter selector switch set to GEN,
inject a 1 kHz tone, 400 mVrms as measured on the METER port.
3. Press F6 to key the radio, then press F8 and use the UP/DOWN arrow
keys to adjust the deviation until 4.6 kHz is just exceeded, then step
down 1 kHz. Tune as close to the upper range as possible
4. Press F6 to dekey the radio, and press F8 to program the softpot value.
Press Enter to move to next softpot value.
5. Repeat steps 2 - 4 for the remaining channel spacings.
6. Press F10 to return to the TRANSMIT menu.
For radios with Conventional Select 5 Signaling software it is currently
ESSENTIAL that the programming of the 25/30 kHz channel spacing is the last
action before exiting this menu. The limit is 4.3 - 4.6 kHz and although the
softpot value will not normally need adjusting the value must be programmed
using the F8 key.
On radios with Conventional Select 5 Signaling software skip
Note
the next three steps and go to "DTMF Transmit Deviation
(GVN6011 only)" on page 6-8 and "Select 5 Transmit
Deviation (GVN6011 only)" on page 6-9.
The DTMF Deviation Softpot is used to tune the FFSK signaling deviation.
1. From the SERVICE menu, press F4 to select SIGNALING alignment.
2. Press F2 again to select the DTMF softpot.
3. Press F6 to key the radio on the test frequency. The screen will indicate
that the radio is transmitting.
4. Measure the DTMF deviation on your service monitor.
5. Use the UP/DOWN arrow keys to adjust the DTMF deviation per Table 6-
4.
Channel Spacing (kHz)
25 / 30
20 (VHF/UHF)
12.5
DTMF
3.05-3.40
2.44-2.76
1.55-1.85
Table 6-4 Signaling Deviation
Radio Tuning Procedure
Trunking MDC
2.5-3.5 3.25-3.75
2.0-2.8 2.6-3.0
1.25-1.75 1.62-1.88
6-7