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4. Connect the equipment as shown in Figure 2-4.
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5. Load and run the test software by following the procedure in \Loading and Running the
est Software" in the \Performance ests" chapter of this guide.
6. Select \Fractional-N Adjustments" from the performance tests main menu.
7. For each API adjustment, the program shows spurs three times, once for each fractional-N
VCO frequency. o minimize the spur, adjust the potentiometers shown in Figure 2-5.
You may have to compromise the three di erent adjustments of the same pot to achieve
the best overall results.
Generally, the API #1 spur is the worst. When adjusting the API #2 and API #4 spurs, their
amplitude may be so low that they are not visible.
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Figure 2-4. Setup for Fractional-N Spur Adjustments
Figure 2-5. API and 100 k z Adjustments
Adjustments
2-9
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