After you mentioned this a couple of weeks ago, Ron, I bought the AF1 and built it in time for CQWW CW this past weekend. I'm not a strong CW operator yet, and these contests are a great opportunity for me to learn by listening. I thought the AF1 might help, given my antenna situation.
Much to my surprise, for the first time I had to use the attenuator on my K1! The JA's especially were beating down the door; too bad they couldn't hear me. Even so, I found plenty of stations that were faint enough that I wanted to use the AF1. At first, I thought it didn't work very well, but then I had a few stations go from "I can puzzle this out in time" to "hey, that was easy" after turning on the AF1! Clearly I'm going to have to play with it more to understand how to adjust it properly, but it does work. I also appreciated how I could have it inline and only turn it on when needed, and even though I'm in the camp that wonders if it would really be so hard to design the mini modules to fit in to a box, the rubber feet kept it stable on top of my K1 even when turning it on without having to hold it. I consider the AF1 a good purchase that will get better as I learn more, and another fun build. Thanks for the tip. 73, Byron N6NUL K1 #2799 AF1, DL1, N-gen, W1, XG2, BL2 On Sun, Nov 28, 2010 at 8:19 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > Jeff, I have compared the K3's APF with the filter offered in Elecraft's > AF-1 Active Filter mini-module kit. There is no difference I can hear in the > performance. Actually the AF-1 has more flexibility since you have two > levels of "Q" to choose from, variable gain, and an independent variable > low-pass filter function. > > At $60, it's a great little filter. > > For an old vacuum-tube jockey like me it's satisfying to see digital gear > struggling to do something as well as analog circuits, Hi! I'll hand it to > Lyle; he succeeded with the APF. It's darn near as good as the AF1. > > Ron AC7AC > > -----Original Message----- > From: elecraft-boun...@mailman.qth.net > [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of jeff martin > Sent: Sunday, November 28, 2010 6:37 PM > To: elecraft@mailman.qth.net > Subject: [Elecraft] K2 APF implementation? > > Any chance we might see an implementation of APF for the audio-based DSP of > the K2? I realize it might require swapping out U3 to implement the change. > I would even give up some of the other functionality if adequate memory > resources don't exist to implement an additional function. > > Any interest? > > Jeff > N7KRT > > ______________________________________________________________ > 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 > -- - Northern California Contest Club - CU in the 2011 Cal QSO Party 1-2 Oct 2011 - www.cqp.org ______________________________________________________________ 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
