I went from a TenTec Orion to my K3 ( whose box I opened almost the very day the K3S was announced which is total BS) and I really mis the SAF feature in the Orion. The APF in my K3 doesn't touch it.
W5SUM Sent from Ronnie's IPhone > On Feb 5, 2016, at 09:56, dave <ho13d...@gmail.com> wrote: > > > I'd agree. My experience with APF is that it will indeed pop a signal that is > already copyable, if a bit weak, out of the noise. Makes for easier copy. > However the ringing is so bad on a really weak signal that it is of no help. > I guess it depends on what you view as 'weak' and your noise level. I was > hoping it would make previously un-copyable signals copyable, but that does > not happen. Instead it improves the copyability of weak but already copyable > signals. > > I find that simply narrowing the filters to 50, 100, or 150 Hz will give > essentially identical results as using the APF and is much easier to do. > > As for the super critical tuning, I do not find it to be all that critical. > The signal can be improved somewhat by going to the 'fine' tuning, but it > makes only a small difference. 10 Hz steps are OK and much quicker. The APF > has a BW of about 30 Hz so tuning cannot be all that critical. +/- 5 Hz out > of 30 is not that big of a deal. > > This has been one of my biggest disappointments with the K3. After reading > all the hype about APF I was hoping for a real improvement. But does not > happen. OTOH, the narrow filters of the K3 are outstanding. > > 73 de dave > ab9ca/4 > > > >> On 2/5/16 8:53 AM, David Kuechenmeister wrote: >> I tried this the other day with no success. That is, the weak >> signal that was barely detectable, became so buried in ringing that >> I couldn't detect it at all. I think I followed the procedure >> outlined in Wayne's email below... Noise was around S5 on 40m and >> the K3 was configured with APF active. I had my 500 Hz filter >> selected and varied the DSP WIDTH from 500 to 300 without >> substantial improvement. FINE tuning selected. What am I >> forgetting? vy 73,Dave N4KD >> >> On Tuesday, February 2, 2016 9:36 AM, Wayne Burdick >> <n...@elecraft.com> wrote: >> >> >> Hi all, >> >> This morning I was hearing lots of very weak signals in the >> 40-meter CW band, right at today's noise floor of about S-5. (Among >> others, I copied BG4GOV in Shanghai.) >> >> Many of the signals were not copyable until I turned on APF (audio >> peaking filter). This filter's center peak is very narrow (around >> 30 Hz), but the response broadens out quickly below the 3-dB points >> in the curve. This brings up the desired signal without allowing >> noise to cause ringing--something often heard with narrow filters >> of the "brick-wall" variety. On a noisy band, the effect is just >> short of magic. >> >> APF is very narrow, so you'll need to tune in 1-Hz increments when >> it is turned on. Also, APF works best when used with a DSP/crystal >> filter WIDTH setting of 300-500 Hz. >> >> Use of APF differs for the three transceivers. >> >> KX3: 1-Hz tuning is selected automatically on the when the APF >> switch is pressed. >> >> K3/K3S: APF is accessed via a hold of the XFIL switch. This >> function is labeled "APF" on a K3S, or "DUAL PB" on the K3). Use >> CONFIG:DUAL PB to make sure the selected filter function is APF. >> See the K3/K3S owner's manual for a description of the alternate >> setting. 1-Hz tuning can be selected by tapping FINE. >> >> You might want to give APF a try if you haven't already. >> >> 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 Message delivered to >> n...@bellsouth.net >> >> >> >> ______________________________________________________________ >> 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 Message delivered to >> ho13d...@gmail.com . >> > ______________________________________________________________ > 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 > Message delivered to w5...@comcast.net ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
