[Elecraft] APF in 4.16/2.63 works well!

Fri Oct 29 14:29:19 EDT 2010

I don't give a hoot about resurrecting an FT1000D, I need the
variability.  I stand by what I said.  The goal is whatever Wayne
makes of it. He's the only one I'm trying to convince here.  73, Guy.

On Fri, Oct 29, 2010 at 1:29 PM, Joe Subich, W4TV <lists at subich.com> wrote:
>
>  > 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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