User's Manual

MAINTENANCE 5543A DIGITAL AGILE PAGE 19
PLL BOARD 1527-1402
ALIGNMENT PROCEDURE
1. Disconnect the PLL reference by removing the plug at J1.
2. Move jumper W1 to setup position
.
3. Connect a digital voltmeter between TP4 (+) and ground (-). Adjust the VCXO set-up bias
potentiometer R39 for a reading of -3.3VDC at TP4.
4. Connect a frequency counter to J5 located on the front panel of the frequency generator tray.
5. Measure the VHF frequency. (if frequency adjustments are necessary call Axcera Customer Service.
6. Set PLL programming as per required channel frequency (see programming chart on schematic)
7. Return jumper W1 to normal position.