Motorola Astro Digital Mobile Radio Xtl5000 Basic 6881096c73 O Manual

6881096C73-OJune 11, 2003
Radio Alignment Procedures: Radio Information 6-3
6.3 Radio Information
Figure 6-3 shows a typical Radio Information screen. All of the data appearing here is informational 
and cannot be changed.
Figure 6-3.  Radio Information Screen
6.4 Transmitter Alignments
6.4.1 PA Bias 1 Alignment
NOTE:This alignment is required after replacing (or servicing) the transceiver board.
The PA Bias 1 alignment procedure adjusts the drain bias current in one of the RF power amplifier 
devices:...

June 11, 20036881096C73-O
6-4Radio Alignment Procedures: Transmitter Alignments
Figure 6-4.  PA Bias 1 Alignment Screen
3. Read baseline current from current meter on power supply.
4. Add baseline current to device bias current to calculate target current.
5. Left-click the Bias Toggle button to apply bias to gate of  device.
6. Adjust softpot value until target current is achieved within 
±10%
7. Left-click the Bias Toggle button to remove bias from gate of device.
8. Left-click the Program All button...

6881096C73-OJune 11, 2003
Radio Alignment Procedures: Transmitter Alignments 6-5
2. Select PA  B i a s  2 from the Tuner Main Menu. When the screen is opened, the radio enters a 
special bias tune mode and radio current increases by approximately 100 mA.
Figure 6-5.  PA Bias 2 Alignment Screen
3. Read baseline current from current meter on power supply.
4. Add baseline current to device bias current to calculate target current.
5. Left-click the Bias Toggle button to apply bias to gate of  device.
6....

June 11, 20036881096C73-O
6-6Radio Alignment Procedures: Transmitter Alignments
2. Select PA  B i a s  3 from the Tuner Main Menu. When the screen is opened, the radio enters a 
special bias tune mode and radio current increases by approximately 100 mA.
Figure 6-6.  PA Bias 3 Alignment Screen
3. Read baseline current from current meter on power supply.
4. Add baseline current to device bias current to calculate target current.
5. Left-click the Bias Toggle button to apply bias to gate of  device.
6....

6881096C73-OJune 11, 2003
Radio Alignment Procedures: Transmitter Alignments 6-7
This test can be done with either the R-2670 Communication Analyzer or the Agilent 8901 
Modulation Analyzer.
 Initial set up using the R-2670 Communication Analyzer:
- RF Control: MONITOR
- B/W: WB
- Freq: RSS frequency under test
- Attenuation: 20dB
- Mon RF in: RF I/O
- Meter: RF Display
- Mode: STD
- Input Level: uV or W
- Display: Bar Graphs
- Squelch: Mid-range or adjust as necessary
 Initial set up using the Agilent...

June 11, 20036881096C73-O
6-8Radio Alignment Procedures: Transmitter Alignments
5. Adjust the reference oscillator’s softpot value until the measured value is as close as possible 
to the frequency shown on the screen. Allow approximately five seconds for the analyzer 
frequency reading to stabilize after each change. See Table 6-10. 
6. Left-click the Program All button on the screen to dekey the radio and save the tuned values.
7. Left-click the Close button on the screen to return to the Tuner Main...

6881096C73-OJune 11, 2003
Radio Alignment Procedures: Transmitter Alignments 6-9
6. Left-click the Program All button to save tuned value.
7. Left-click Close button to close screen and return to the Tuner Main Menu.
6.4.6 Tx Power Characterization
NOTE:This alignment is required after replacing (or servicing) the transceiver board.
The Tx Power Characterization alignment procedure characterizes power tuning so that Tx power 
can be adjusted with CPS software. You will transmit at two power levels for...

June 11, 20036881096C73-O
6-10Radio Alignment Procedures: Transmitter Alignments
4. Left-click the PTT Toggle button to transmit at indicated frequency and record power 
measurement with 0.1 W resolution. The green circle will turn red indicating that the radio is 
transmitting.
5. Left-click the PTT Toggle button to disable transmit mode.
6. Enter the power measurement with 0.1 W resolution overwriting any value that may reside in 
the box from previous tuning.
7. Left-click in the first box of the...

6881096C73-OJune 11, 2003
Radio Alignment Procedures: Transmitter Alignments 6-11
2. Select Tx Current Limit from the Tuner Main Menu.
Figure 6-10.  Tx Current Limit Alignment Screen
3. Use a slider or the spin buttons to change any one softpot value to 255.
4. Left-click the Program All button to save the tuned value. All softpots will change to 255, and 
transmit-current limiting will be disabled.
5. Left-click in upper softpot box.
6. Left-click the PTT Toggle button to transmit and record radio the...

June 11, 20036881096C73-O
6-12Radio Alignment Procedures: Transmitter Alignments
12. Left-click the Program All button to save tuned value.
13. Left-click the Close button to close screen and return to the Tuner Main Menu.
6.4.8 Tx Deviation Balance (Compensation)
NOTE:This alignment is required after replacing (or servicing) components on the transceiver board.
The Tx Deviation Balance (Compensation) alignment procedure balances the modulation 
contributions of the low- and high-frequency portions of a...