[Elecraft] APF For K3

[Roy Morris]

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