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When it is working correctly, with the test detector, you should see a flat line. When you select a marker button, then rotate the control, you should see a bright marker dot move along the line. The marker display will indicate the exact frequency of the marker at that point. I typically set as you see from my CT-100 IF response, to have the 5 markers from left to right across the the response.
Are you inserting the detector circuit?
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