We might have a field-test revision of K3 code that includes APF sometime this week.
In this test version, APF is turned on by rotating the WIDTH control counterclockwise past the 50-Hz setting ("BW 0.05") to the 30-Hz APF setting ("APF 0.03"). This eliminates the need for a menu entry or a new switch function. A new DSP graphic pattern shows that APF is in effect. SHIFT can be used, with either 10- or 50-Hz steps. The APF filter is an "IIR" (infinite impulse response) DSP filter that accurately emulates the equivalent analog circuitry. There's a slight ring to the filter, as expected. Gain is also increased when APF is turned on, compensating for the loss of overall signal+noise that occurs at this very narrow bandwidth. 73, Wayne N6KR ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html