On Mon, Nov 29, 2010 at 7:20 PM, Ron D'Eau Claire <ron at cobi.biz> wrote: > I didn't say the KAF2, Bill. I'm speaking of the Elecraft AF1 Mini-module. > > The circuit in the AF1 is an active filter of the type the APF emulates in > DSP. > My mistake Ron. I thought you meant the KAF2. 73, Bill