Table 6-4. Pa Bias 2 Alignment Amplifier Devices - Motorola ASTRO XTL 5000 Basic Service Manual

Radio Alignment Procedures: Transmitter Alignments
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. This alignment
is not required for UHF range 2 because for UHF range 2 PA Bias 2 is a fixed value.
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
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 2 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.
6871769L01-A

Table 6-4. PA Bias 2 Alignment Amplifier Devices

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
Table 6-5. Power Supply Voltage Settings
Supply Voltage (V)
Device
Driver
Final2
Final2
Final2
Final2
Final2
Table 6-5. Set power supply current limit to 3 A.
Supply Current Limit (A)
13.6
13.4
13.6
13.4
13.6
13.6
6-5
3
3
3
3
3
15
October 30, 2006