Figure 6-5. Pa Bias 1 Alignment Screen; Table 6-2. Power Supply Voltage Settings; Table 6-3. Pa Bias 1 Alignment Device Bias Current - Motorola ASTRO XTL 5000 Basic Service Manual

6-4
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
VHF 50 W/25 W
VHF 100 W
UHF R1 40 W
UHF R1 100 W
UHF R2 45 W
700–800 MHz 35 W
2. Select PA Bias 1 from the Tuner Main Menu. When the screen is displayed, the radio enters
a special bias tune mode, and radio current increases by approximately 100 mA.
3. Read baseline current from current meter on power supply.
4. Add baseline current to device bias current to calculate target current.
VHF 50 W/25 W
VHF 100 W
UHF R1 40 W
UHF R1 100 W
UHF R2 45 W
700–800 MHz 35 W
5. Left-click the Bias Toggle button to apply bias to gate of device.
6. Adjust softpot value until target current is achieved within
October 30, 2006

Table 6-2. Power Supply Voltage Settings

Supply Voltage (V)

Figure 6-5. PA Bias 1 Alignment Screen

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

Band/Power Level
Radio Alignment Procedures: Transmitter Alignments
Table 6-2. Set power supply current limit to 3 A.
Supply Current Limit (A)
13.6
13.4
13.6
13.4
13.6
13.6
Device Bias Current (mA)
400
75
200
500
NA
250
±
10%
3
3
3
3
3
15
6871769L01-A