Chapter 3 3-29
Adjustments and Correction Constants
Cavity Oscillator Frequency Correction Constants (Test 54)
Spurs Search Procedure without a Filter
8. Press and the other softkeys as required to
observe and mark the target spur.
9. The target spur will appear in many variations. Often it will be difficult to identify
positively; occasionally it will be nearly impossible to identify. Do not hesitate to press
as many times as necessary to thoroughly inspect the current span.
The target spur usually appears as one of a group of four evenly spaced spurs as in
Figure 3-12. The target spur is the right most spur (fourth from the left). On any
particular sweep, one, any, or all of the spurs may be large, small, visible, invisible,
above or below the reference line.
Figure 3-12 Typical Display of Four Spurs without a Filter
On occasion the largest spur appears as one of a group of five evenly spaced spurs as
shown in Figure 3-13. The target spur is again the fourth from the left (not the fifth,
right-most spur).
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