It makes sense to me Joe, (sorry Guy) If you want a "milder shape" you don't really need APF. Milder shape is the opposite of "peaking"
Bob K6UJ On Oct 31, 2010, at 4:33 PM, Guy Olinger K2AV wrote: > You've brought that up several times, Joe, but that is not the sound, > and how do you use it in CW with Shift increment at .01, particularly > with DUAL PB turning APF on and off? 73, Guy. > > On Sun, Oct 31, 2010 at 4:47 PM, Joe Subich, W4TV <[email protected]> wrote: >> >>>> What I have been trying to point out is that there is a general >>>> benefit for a milder shape, that one MAY leave on all the time, >>>> and tweak to tight as needed. >> >> If you want a "milder" shape, use Dual PB filter with a 400 - 500 Hz >> background and 100 Hz foreground. That can certainly be left on >> all the time and the APF switched on when needed ... at least once >> all of the controls have been programmed. >> >> 73, >> >> ... Joe, W4TV >> >> >> On 10/31/2010 12:03 PM, Guy Olinger K2AV wrote: >>> >>> I'd say for variable Q, the tightest setting should be just what is >>> there now. So no one is losing anything. >>> >>> What I have been trying to point out is that there is a general >>> benefit for a milder shape, that one MAY leave on all the time, and >>> tweak to tight as needed. MP's EDSP, 450 Hz sidetone, NR=D, Contour= >>> 11 oclock as an example of a mild contour that is really helpful. >>> >>> Being able to tune the APF tight setting around allows me to match the >>> "tone" of the almost ring to the remembered tone of the weak station >>> and have it come up when I hit it. >>> >>> If the choice is sharp or no APF and no APF tune, I have to RIT the >>> station to sidetone. This has a couple of disadvantages. >>> >>> First, if running in a contest, and there are very loud stations up >>> and down (aren't there always?), RIT up and down is going to let the >>> co-channel guys in under the roofing filter and into pre-APF digital >>> space. That can't be useful. Second, continuing to tune the station >>> in becomes hard if the station stops or fades out because there is >>> nothing to "calibrate" the completion of RIT twiddle other than >>> hearing the tone from the station move to sidetone, and now it's >>> stopped or faded. >>> >>> The presence of APF tune, or variable Q does not disadvantage anyone >>> who doesn't need them, the same way all the really neat digital stuff >>> does not disadvantage the straight CW operators. The current setting >>> and shape of APF is definitely the right max Q setting, and does very >>> well for me. >>> >>> I just want a mild Q setting to imitate the shape I had with the MP >>> all those years. Those who hear it will get it, just like those that >>> hear the sharp APF for the first time and try it, get it. I think a >>> lot of people will leave a mild Q on ALL THE TIME for general >>> operating. It lowers the level of the stuff up and down a little >>> without any ringing, but still allows one to hear up and down for off >>> frequency callers. For me it's an EASIER listen for hours on end. >>> >>> 73, Guy. >>> >>> On Sun, Oct 31, 2010 at 10:47 AM, Steve Ellington<[email protected]> >>> wrote: >>>> >>>> If the caller is off frequency I would just use RIT to center him in my >>>> passband as usual and let APF do it's thing. >>>> Having used outboard APFs for years, the ability to adjust it's >>>> selectivity >>>> is very important. If the band is quiet and the signal is very weak, I >>>> would >>>> adjust the APF nearly to the point of oscillation then back it off a tad. >>>> If >>>> the signal is weak but there is a lot of QRN, I would back off the >>>> selectivity a bit further but still take advantage of some extra peaking >>>> capability. >>>> >>>> N4LQ >>>> Steve >>>> >>>> ----- Original Message ----- >>>> From: "Joe Subich, W4TV"<[email protected]> >>>> To:<[email protected]> >>>> Sent: Sunday, October 31, 2010 10:27 AM >>>> Subject: Re: [Elecraft] K3 APF Adjustable Q >>>> >>>> >>>>> >>>>>>> however the fixed Q has a bit of ring and at times I would like to >>>>>>> back it off (widen) it just a tad. >>>>> >>>>> This is the same mistake Yaesu made in the FT-1000D; de-Qing the >>>>> original APF made it useless in later radios. This is the very >>>>> reason not to add adjustable Q or reduce the Q of the APF currently >>>>> in field test. If you want a less aggressive filter that is centered >>>>> on the sidetone, use Dual PB ... that's exactly what it is designed >>>>> to do (and it does a very good job when used as designed). >>>>> >>>>> Adjustable center frequency is very important ... particularly when >>>>> PB CTRL is set for Shift=.05 (to allow LO-CUT-HI to function) as >>>>> the 50 Hz increments too course to tune APF using the VFO. The user >>>>> also needs the ability to adjust the peak independently in order to >>>>> peak up an off frequency caller and not "chase them up the band." >>>>> >>>>> 73, >>>>> >>>>> ... Joe, W4TV >>>>> >>>>> >>>>> On 10/31/2010 8:58 AM, Steve Ellington wrote: >>>>>> >>>>>> If I had a choice between variable center frequency and adjustable Q, I >>>>>> would choose adjustable Q. >>>>>> >>>>>> My logic is: The center frequency automatically follows the sidetone >>>>>> frequency so I have no need to adjust it however the fixed Q has a bit >>>>>> of >>>>>> ring and at times I would like to back it off (widen) it just a tad. >>>>>> >>>>>> Otherwise it's a HUGE improvement, sounds great and I wish to thank >>>>>> those >>>>>> who made it possible. >>>>>> >>>>>> 73 >>>>>> N4LQ >>>>>> Steve >>>>>> >>>>>> ______________________________________________________________ >>>>>> Elecraft mailing list >>>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>>>>> Help: http://mailman.qth.net/mmfaq.htm >>>>>> Post: mailto:[email protected] >>>>>> >>>>>> 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:[email protected] >>>>> >>>>> 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:[email protected] >>>> >>>> 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:[email protected] > > 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:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
