I know it's hard to please everyone in a situation like this but, as a blind CW op, I'm fervently voting for APF not to be put on a menu. This is an addition I eagerly anticipate and expect to use a lot. I know we blind ops are a distinct minority here but, currently, we don't have access to the menus. Putting it on a front panel control would put it in our hands. Thanks. lou WA3MIX ----- Original Message ----- From: "The Smiths" <notforc...@hotmail.com> To: <ve3...@storm.ca>; "Elecraft Reflector" <elecraft@mailman.qth.net> Sent: Wednesday, October 27, 2010 6:07 PM Subject: Re: [Elecraft] APF For K3
> > Rich, > > that was VERY well put. Even a dummy like me could understand that > clearly. I think as much as your idea of the Q being on the Width control > is a good one, I may actually rather put that Q setting in the Config > menu. I don't see adjusting the Q as often as I would the Frequency of > the APF as you described. > > One reason that the Shift knob is the best candidate is be because it > seems that just like when you put the Dual PB filter on, the Shift is > centered you are unable to adjust it, it will be the same with the APF on > (or at least this is my understanding at this point). So it really > wouldn't make any difference regardless. > I much prefer to keep the Width control active, because I can see that > I'll probably end up using that APF on almost all of the time. In that > case I want to be able to still operate my Width at any given time without > turning on and off my APF to do so. > If it is the case where the Shift doesn't work when the APF is on, than it > would be nice if in the future the Shift would retain it's setting until > the operator turns off the APF and readjusts it. > > >> Date: Wed, 27 Oct 2010 16:54:34 -0400 >> From: ve3...@storm.ca >> To: elecraft@mailman.qth.net >> Subject: Re: [Elecraft] APF For K3 >> >> Here is an operational scenario: >> >> You are CQing in the CQ WW CW contest. There are other loud stations >> CQing on either side of you. You have adjusted your SHIFT and WIDTH >> controls to eliminate the adjacent-channel interference while still, you >> hope, being wide enough to catch anyone calling you. >> >> A weak station replies to your CQ, but he's some distance off your >> frequency, although still within your bandpass. You'd like to be able to >> put an audio peaking filter on his signal without affecting the rest of >> your setup. >> >> You don't want to change your sidetone pitch; that's a separate question >> for a separate discussion. You don't want to use RIT or CWT, because >> that will bring one of the adjacent loud signals into your bandpass. >> Anyway, the desired signal is too weak to trigger CWT. Likewise, you >> don't want to shift your main DSP filter bandpass (the "context"); >> you've got this set up for where you are and you don't want to change it >> just for this one 30-second QSO. If you didn't have an APF, you might >> try narrowing the DSP filter bandwidth, but he's far enough >> off-frequency that doing so would run the risk of losing his signal, >> meaning you would have to fiddle with both SHIFT and WIDTH to home in on >> him, and that takes time to do, plus more time to restore them after the >> QSO. >> >> What you would really like to be able to do is to adjust an audio peak >> filter's frequency so that it is on top of the received weak signal, but >> without affecting the context (your DSP shift and width, your sidetone >> pitch, or your transmit frequency - these should all stay where they >> were). >> >> My suggestion would be to use one of the buttons (DUAL PB seems to be a >> possible candidate here) to turn the APF feature on, and while the >> feature is on, the SHIFT and WIDTH controls would adjust the APF >> frequency and width (or Q) and would have no effect on the context >> filtering. RIT and SPLIT would still work normally, it's just SHIFT and >> WIDTH that would have been subverted to do the APF adjustments while the >> APF is on. If you really did want to adjust the context filter width or >> shift, you would have to turn APF back off to do so. Once the QSO with >> the weak station had been successfully concluded, you could either turn >> APF off, or else leave it on with its width adjusted to include the >> entire context bandpass, and carry on CQing. >> >> My 2c worth. >> >> 73, >> Rich VE3KI >> >> >> >> ______________________________________________________________ >> 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 > > ______________________________________________________________ > 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 ______________________________________________________________ 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
