I'm curious about others BW (width) setting on CW If weak, really weak using 20 to 15 hz Going narrower to 10 or 5hz setting doesn't seem to do much Really helps on weak 160 signals, generally APF off
73 Robert W5AJ -----Original Message----- From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of brian Sent: Sunday, October 16, 2016 9:43 AM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] (K3) APF and selected bandwidth Part of the problem with narrower bandwidths is making sure the signal is at the APF peak. I had fits trying to use APF with 200-400 Hz dialed in until I launched Spectrogram and made sure the signal peak aligned with the APF peak. Weak signals still show even when you have trouble hearing them. This alignment helps with pulling them out. One can tune either the K3 shift knob or K3 main tuning if it is set at 1 Hz steps. Works every time. Spectrogram can be collapsed to a small rectangle for this purpose an permanently left on the display. HSDR also has a narrow bandwidth display. Other spectrum display programs would work as well. 73 de Brian/K3KO On 10/16/2016 13:03 PM, Chip Stratton wrote: > I seem to recall a recommendation to use a 400 Hz bandwidth with APF. > In my own exerience, narrowing DSP bandwidth much below this does not > seem to help APF function and rather muddies it. > > Chip > AE5KA > > On Sat, Oct 15, 2016 at 11:44 PM, Brian Hunt <huntin...@coastside.net> > wrote: > >> On the other hand, when used in conjunction with NR a wider DSP BW is >> desirable since NR works on uncorrelated noise. Try: >> BW= 700-1000 Hz, >> NR= ~ 5-3 >> APF= ON >> Great for pulling out weak signals on an uncrowded band. The NR >> settings of 5 and above mix processed and non-processed data so the >> APF has something to work on. My theory, anyway. >> >> 73, >> Brian, K0DTJ >> >>> On Oct 15, 2016, at 19:52, Ken Arck <k...@arcomcontrollers.com> wrote: >>> >>> The narrower the bandwidth, the better signal to noise. >>> >>> That should answer your question :-) >>> >>> Ken >>> >>> >>> At 07:39 PM 10/15/2016, Robert G Strickland wrote: >>>> When using the APF, does it make a difference which bandwidth has >>>> been >> selected? Or in other words, does APF work better on top of a narrow >> or wide bandwidth, or is selected bandwidth irrelevant? Thanks. >>>> ...robert >>>> -- >>>> Robert G Strickland, PhD ABPH - KE2WY rc...@verizon.net.usa >>>> Syracuse, New York, USA >>>> >> >> ______________________________________________________________ >> 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 >> lightdazz...@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 > als...@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 wood...@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 arch...@mail-archive.com
