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APF For K3

Posted by Roy Morris-6 on Oct 25, 2010; 5:47pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688.html

Paul,
I agree that the APF needs to have a high Q center frequency.  This peaks the audio in a razor thin passband enabling a weak CW signal to be heard.  A variable audio passband is needed as well as an adjustment for depth of peak.  There is no feature on the K3 that can do the job better than a good APF function.  From some of the comments I have read on this reflector I do not believe many hams are familiar with this feature.  Those who primarily use CW would find APF highly desirable.  Roy Morris  W4WFB
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