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 ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected]
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