[Elecraft] APF in 4.16/2.63 works well!

[Brendan Minish]

Variable Q might be nice, it seems a pretty good compromise as is though.
the issue I would have with putting the Q on the width control is that 
this then prevents the user altering the IF filter bandwidth when the 
APF is selected

Currently I am finding that I am still playing with the IF width control 
quite a bit when  APF is selected

so far on 160m the APF feature is able to help dig out signals that are 
too poor to dig out by ear without it. This is a great addition


On 29/10/2010 16:58, 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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