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Adjustments

VCO Bias Potentiometer Calibration

4-11

VCO Bias Potentiometer Calibration

Description

This adjustment sets the VCO bias potentiometer at a level that will keep the VCO in a stable operating

region over the entire frequency and temperature range. First, the F/2 and the lock angle potentiometers are

set fully CW (clock-wise). The signal generator is set to 750 MHz and the potentiometer is adjusted until the

F/2 oscillations disappear. The voltage at the SYNTH_F2 ABUS node is measured and then the potentiometer

is adjusted for a 0.77 V to 0.80 V drop.

After you have performed this adjustment, you must perform the “Lock Angle Potentiometer Calibration (Not

Used with Option UNJ or Option 506)” on page 4-12.

Required Test Equipment

• Agilent 8563EC Option 001 spectrum analyzer

Procedure

Figure 4-5 VCO Bias Potentiometer Calibration Setup

1. Connect the equipment as shown above.

2. Preset all of the equipment.

3. Follow the instructions as they appear on the controller’s display.

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Agilent Technologies E4438C Guida di Installazione Pagina 103