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There is an article in the March 2011 QST by KC2KZJ (page 48) where he describes using his spectrum display to adjust his antenna tuner. I just tried it with the K3/P3 and a Drake MN-4 tuner connected through a 4-to-1 balun to a 132' center-fed zepp antenna. The noise source was a Palomar Tuner-Tuner model PT-340. I found matches from 80m to 10m by watching the P3 display and adjusting for minimum noise level. The nulls on some bands are very sharp, and using the P3 made it easier to find the right settings.
I normally do not use the manual tuner with the K3, since it has the KAT3. But the settings were written down and will be used with the Drake equipment.
73,
John W2XS
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