Posted by
k6dgw on
Aug 25, 2020; 8:49pm
URL: http://elecraft.85.s1.nabble.com/APF-Primer-tp7664298p7664319.html
Kevin:
1) For a K3, APF seems to be very dependent on current AGC action. If
there are very strong signals close in and the AGC is doing its thing,
APF doesn't seem to work. You can adjust the AGC parameters, however my
experience is that I use APF infrequently enough that it's better to
adjust the AGC to non-APF situations.
2) The APF will ring, it is very narrow. With APF on, using a wider
DSP BW [400 or 500 Hz] will help some. Tuning just off the peak, if
possible, can also help although even at 1 Hz tuning, sometimes that's hard.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 8/24/2020 7:33 PM, kevinr wrote:
> I have used APF a number of times. Sometimes it worked, but often the
> ringing makes it hard to hear anything intelligible.
>
> I have a two families of questions to hopefully remedy my problem.
>
> 1) What are the best band conditions to try APF? Does it work under
> medium QSB against medium to high noise levels? Is it better on 80,
> 40, or 20 meters?
>
> 2) What are the procedures to use APF on your K3, KX2, KX3, etc.? How
> should I set the bandwidth of the filter I'm already using? How do I
> peak the APF performance? Does the set up change on a per band basis
> or does one setting fit all cases?
>
> As I mentioned, I have gotten it to work well a few times, but usually
> the signal sounds buried in a hard walled well. Then I get emails
> telling me how well it worked during ECN. My interest is renewed,
> hence my questions.
>
> Help?
>
> Kevin. KD5ONS
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