[Elecraft] APF in 4.16/2.63 works well!

Fri Oct 29 14:39:02 EDT 2010

I'm sorry but I'm not going to sit idly by while some other ham who's in love with his 1980's FT-1000 dictates why I can't have a Q setting on my rig.  The Q is a necessary part of this feature in my mind.  This is NOT an FT-1000 this is a K3.  Just because your old rig used to work well for you without a Q has nothing to do with my new rig.

And if you must make comparisons, than you can use the FT-2000 and it's contour filter (APF) which does have it's variable Q and boost level... Both living in the menus... Sorry but times move on, and you should too.  Only the IDEA of the APF was conceived from the FT-1000, not the entire design and implementation... Please don't limit the rest of us.

> Date: Fri, 29 Oct 2010 13:29:12 -0400
> From: lists at subich.com
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] APF in 4.16/2.63 works well!
> 
> 
> > I would like to be able to ***VARY THE Q*** with the width control and
> > LEAVE IT ON with a mild Q, and sharpen it as required.
> 
> The design goal was to duplicate the FT-1000D APF. The FT-1000D has
> no variable Q function. What you are proposing is completely different
> than the design parameters ... you want an Autek QF1 not the FT-1000D APF.
> 
> >> When APF is in there is no moderate setting, it takes over the
> >> passband and makes copy of a signal up band difficult.
> 
> That's the goal of the FT-1000D APF ... single signal reception in
> noise and QRM. If you want a context filter, the original Dual PB
> filter with it's variable with and shift fill that role.
> 
> >> ONLY when APF is on could we have the WIDTH tap toggle between APF
> >> Q displaying APF Q=3 in lower display and between Roofing/DSP
> >> bandwidth displaying BW 0.40??? You could do the same thing with
> >> SHIFT to go back and forth between adjusting Roofing/DSP SHIFT
> >> displaying FC *0.45 and APF *0.45.
> 
> Width/shift taps are already "taken" if the user has not chosen PB
> Shift=.01. There is no current requirement to select PB Shift=.01
> in order to use APF and I hope that *someday* Wayne will give us the
> ability to use LO-CUT-HI with PB Shift=.01.
> 
> 73,
> 
> ... Joe, W4TV
> 
> On 10/29/2010 12:58 PM, Guy Olinger K2AV wrote:
> > APF has a very significant improvement on weak signals in the noise.
> > I completely agree with prior posters. HOWEVER...
> >
> > I would like to be able to ***VARY THE Q*** with the width control and
> > LEAVE IT ON with a mild Q, and sharpen it as required. If I can back
> > it out to 2 dB with a width function I would probably leave that on
> > all the time and grind in as needed. I already do that with Width in
> > weak cases that are on frequency. ONLY when APF is on could we have
> > the WIDTH tap toggle between APF Q displaying APF Q=3 in lower display
> > and between Roofing/DSP bandwidth displaying BW 0.40??? You could do
> > the same thing with SHIFT to go back and forth between adjusting
> > Roofing/DSP SHIFT displaying FC *0.45 and APF *0.45. Using WIDTH to
> > control Q is intuitive.
> >
> > When APF is in there is no moderate setting, it takes over the
> > passband and makes copy of a signal up band difficult. It will
> > require repeated use of DUAL PB to go in and out for weak signals and
> > back out for normal use. Use of a HOLD function as a frequent change
> > is a problem. In trying to get used to the HOLD on DUAL PB to go in
> > and out of APF to hear in the rest of the channel, I repeatedly hit
> > NTCH instead. HOLD's are only good for settings that persist for a
> > while during operation.
> >
> > E.g. I don't need APF ONLY as a better substitute for 50 Hz. I need
> > it to work ALSO as a milder center emphasis inside the 400 Hz roofer,
> > and be able to twist a knob somewhere to move between mild and sharp.
> > Even with what appears to be only a 2 dB peaking around 450, the MP
> > was improved inside its excellent dual INRAD 400 selectivity.
> >
> > If this is not done, it will be very difficult to use it well in a
> > contest. No easy-to-use variable Q is a deal-breaker for me. In the
> > end for contests it will cost Q's and will have to tell people to
> > leave it off, just like NR. Only turn it on for a really weak one if
> > you can remember how, and then turn it right back off. Then when I
> > get home chasing weak DX I'll turn it all back on again, and work some
> > stuff I couldn't hear before.
> >
> > 73, Guy.
> >
> > On Fri, Oct 29, 2010 at 11:01 AM, drewko<drewko1 at verizon.net> wrote:
> >> Yes, I realize that. I would like to compare what is heard using the
> >> APF filter to what is displayed by BeaconSee with its sub-noise signal
> >> recovery algorithms.
> >>
> >> 73,
> >> Drew
> >> AF2Z
> >>
> >>
> >> On Fri, 29 Oct 2010 10:55:38 -0400, you wrote:
> >>
> >>>
> >>> I think you may be confused about what APF is. It is NOT a waterfall or any
> >>> kind of visual indicator. It IS an Audio Peaking Filter (APF) meant to
> >>> enhance weak signal audio using the processor between your ears. It will
> >>> not automatically show you where weak signals are in a spectrum, but if you
> >>> know approximately where to look (either from a Packet spot or waterfall
> >>> trace) it can help your ear/brain decode the CW audio buried in noise.
> >>>
> >>> 73, Bill
> >>
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