Tuning Procedure; Starting The Tuning Procedure; Reference Crystal Data; Tx Power - Motorola GTX/LCS 2000 Service Manual

Tuning Procedure

Starting the Tuning
Procedure

Reference Crystal Data

Tx Power

Reference Oscillator
Alignment

Transmitter Power

1. From the SERVICE menu, press F6 to select BOARD REPLACEMENT.
2. Press F2 for LOGIC OR RF BOARD replacement.
Note: Perform the following procedures in the sequence indicated.
1. Press F2 to select REFERENCE CRYSTAL DATA.
2. Press F8 for PROGRAM VALUE.
1. Press F3 to select Tx POWER.
2. Press F6 to key the radio. The screen will indicate that the radio is
transmitting.
3. Adjust the transmit power value with the UP/DOWN arrow keys.
4. Press F6 again to dekey the radio, and then press F8 to program the softpot
value.
Adjustment of the reference oscillator is critical for proper radio operation.
Improper adjustment will not only result in poor operation, but also a misaligned
radio that will interfere with other users operating on adjacent channels. For this
reason, the reference oscillator should be checked every time the radio is serviced.
The frequency counter used for this procedure must have a stability of 0.1 ppm (or
better).
1. Press F4 to select the REFERENCE OSCILLATOR softpot.
2. Press F6 to key the radio. The screen will indicate that the radio is
transmitting.
3. Measure the transmit frequency that appears on the screen of your
frequency counter.
4. Use the UP/DOWN arrow keys to adjust the reference oscillator.
5. Press F6 again to dekey the radio and then press F8 to program the softpot
value.
1. Press F5 to select the Tx POWER calibration softpot. The screen will
indicate the transmit test frequencies to be used.
2. Press F6 to key the radio.
3. Use the UP/DOWN arrow keys to adjust the transmit power value.
4. Press ENTER to select next softpot frequency.
5. Repeat steps 3 and 4 for the remaining test frequencies.
6. Press F6 to dekey the radio.
7. Press F8 to program the value.
Radio Tuning Procedure 6-3