Transmitter Power - Motorola MCX600E Service Manual

7.3

Transmitter Power

The radio has two power level settings, a high power level setting, and a low power level setting.
IMPORTANT : To set the transmitter power for customer applications use the Common Radio
Parameters window under the Edit menu and set the "Low Power Level" and "High Power Level"
powers to the desired values. Only if the transmitter components have been changed or the
transmitter does not transmit with the power set in the Common Radio Parameters window the
following procedure should be performed.
The advanced power setting technology employed in the radio makes use of two reference power
level settings along with parameters describing the circuit behaviour. To determine these parameters
the DPS requires the power values measured for two different settings.
1. From the Service menu, select Transmitter Alignment.
2. Select RF Power Tuning to open the RF power tuning window. The window will indicate the
transmit test frequencies to be used.
3. Select Point 1 value of the first frequency.
4. Click Toggle PTT to key the radio. The status bar will indicate that the radio is transmitting.
5. Measure the transmitter power on your power meter.
6. Enter the measured value in the box Point 1.
7. Select Point 2 value of the first frequency.
8. Measure the transmitter power on your power meter.
9. Enter the measured value in the box Point 2.
10. Click Toggle PTT to dekey the radio.
11. Repeat steps 4 - 7 for all test frequencies shown in the window.
12. Click Program to store the softpot values.
7.4 Battery Threshold
The radio uses 2 battery threshold levels Tx High and Tx Low to determine the battery condition.
The Program buttons must only be activated when the power supply is set to the indicated voltage. If
the DPS detects that the voltage is not within the expected range for the threshold in question then a
message will be displayed to warn that the radio may not be set up correctly for the alignment
operation.
CAUTION:
1. From the Service menu, select Transmitter Alignment.
2. Select Battery Threshold to open the battery threshold tuning window. The current softpot
values are displayed for information only and can´t be edited.
3. Set the supply voltage to the value indicated for TX High.
4. Click the TX High Program button to store the softpot value for TX High.
5. Set the supply voltage to the value indicated for TX Low.
6. Click the TX Low Program button to store the softpot value for TX Low.
7. Close the window by clicking Cancel.
Maintenance
Inadvertant use of the program buttons may result in radio failure.
Radio Tuning Procedure
3-9