User's Manual

MAINTENANCE 5543A DIGITAL AGILE PAGE 15
UHF GENERATOR BOARD (A15-A1) 1512-1101
ALIGNMENT PROCEDURE
1. Connect the main output from the channel oscillator section of the UHF Generator Board
(J1) to a spectrum analyzer, tuned to the crystal frequency and peak the tuning capacitors C6
and C11 for maximum output. Tune L3 and L2 for maximum output. The output level
should be +5 dBm ±2 dB.
While monitoring with a DVM, maximize each of the following test point voltages by
tuning the broadband multipliers in sequence.
2. TP1: Tune C32 for maximum (Typical 0.6 VDC).
TP2: Tune C34 and C38 for maximum (Typical 1.2 VDC).
TP3: Tune C40 and C44 for maximum (Typical 2.0 VDC).
TP4: Tune C46 for maximum.
TP4: Re-peak C38, C40, C44 and C46 (Typical 3.5 VDC).
3. Connect a spectrum analyzer, tuned to 8 times the crystal frequency, to the UHF Generator
output (J3). Monitor the output while peaking the tuning capacitors for maximum output.
4. The output level at J2 should be +15 dBm ±2 dB.
WARNING: Performing step 1 in this procedure may change phase noise of
oscillator.