Transmit Current Limit; Transmit Deviation Balance (Compensation) - Motorola MCS 2000 Service Instructions Manual

Transmit Current
Limit
Transmit
Deviation Balance
(Compensation)
4. Press F6 to key the radio, and use the UP/DOWN arrow keys to adjust the
transmit power per the value shown in Table 6-2.
5. Press F6 to dekey the radio, and then press F8 to program the value. Press
ENTER to select next softpot frequency.
6. Repeat steps 4 and 5 for the remaining test frequencies.
7. Press F10 to return to the TRANSMIT menu.
After POWER tuning, measure and note the DC current to the
Note
radio on each channel in the high power level. These values
are needed for the Current Limit tuning.
Larger Softpot Values yield increased Cutback resulting in
Lower Power.
For 800/900 MHz radios tuning is done with three voltages:
11.8 V, 13.8 V and 15.5 V.
1. Press F9 to select the Current Limit softpot. The screen will indicate the
transmit test frequencies to be used.
2. Select the frequency with the highest DC current drain as measured
during the power tuning procedure.
3. Press F6 to key the radio and use the UP/DOWN arrow keys to adjust the
transmit Current Limit until the power has reached the maximum
nominal power of the radio (10, 12, 15, 25, 30, 35, 40, 55 or 110 Watts).
If the value cannot be exactly tuned set the output power one step above
the nominal value.
4. Increase the current limit setting by number of steps defined in Table 6-
3.
5. Press F6 to dekey the radio.
6. Press F8 to program the value. (The six other softpot values do not need
tuning because only one Current Limit value is held in the radio).
7. Press F10 twice to return to the SERVICE menu.
Model
VHF
UHF
800 MHz/900 MHz
Table 6-3
Compensation alignment balances the modulation sensitivity of the VCO and
reference modulation (synthesizer low frequency port) lines. Compensation
algorithm is critical to the operation of signaling schemes that have very low
frequency components (e.g. DPL) and could result in distorted waveforms if
improperly adjusted.
1. Press F4 to select the TRANSMIT DEVIATION BALANCE softpot. The
screen will indicate the transmit test frequencies to be used.
Power
all power levels
all power levels
all power levels
Current Limit Step Adjustment
Radio Tuning Procedure
Steps
3
0
3
6-5