Pa Bias 2 Alignment; Figure 6-4. Pa Bias 1 Alignment Screen; Table 6-3. Pa Bias 1 Alignment Device Bias Current; Table 6-4. Pa Bias 2 Alignment Amplifier Devices - Motorola ASTRO XTL 5000 Basic Service Manual

6-4
3. Read baseline current from current meter on power supply.
4. Add baseline current to device bias current to calculate target current.
700–800 MHz 35 W/15 W Motorcycle
5. Left-click the Bias Toggle button to apply bias to gate of device.
6. Adjust softpot value until target current is achieved within
7. Left-click the Bias Toggle button to remove bias from gate of device.
8. Left-click the Program All button to save tuned value.
9. Left-click Close button to close the screen and return to the Tuner Main Menu.
6.4.2

PA Bias 2 Alignment

NOTE: This alignment is required after replacing (or servicing) the transceiver board.
The PA Bias 2 alignment procedure adjusts the drain bias current in one of the RF power amplifier
devices:
NOTE: The antenna port should be terminated with a 50-ohm load while tuning.
1. Set the power supply voltage as indicated in
Band/Power Level
700–800 MHz 35 W/15 W Motorcycle
June 11, 2003

Figure 6-4. PA Bias 1 Alignment Screen

Table 6-3. PA Bias 1 Alignment Device Bias Current

Band/Power Level

Table 6-4. PA Bias 2 Alignment Amplifier Devices

Band/Power Level
700–800 MHz 35 W/15 W Motorcycle

Table 6-5. Power Supply Voltage Settings

Supply Voltage (V)
Radio Alignment Procedures: Transmitter Alignments
Device bias current (mA)
250
±
10%
Device
Final2
Table 6-5. Set power supply current limit to 3 A.
Supply Current Limit (A)
13.6 15
6881096C73-O