, 11 May 2013 11:46 a.m.
To: Elecraft
Subject: [Elecraft] K3 -Advice: how to configure APF for least ringing
As a 98% cw operator, I've explored the various K3 weak signal features.
I tend to shy away from the APF because its ringing seems to my ears to be
counter productive. Any advice
RobertG wrote
I tend to shy away from the APF because its ringing seems to my ears to
be counter productive. Any advice/experience on how to set up and use
this feature for best results?
If you don't use APF you're missing one of the best features of the K3 for
weak signals. I now use it
As a 98% cw operator, I've explored the various K3 weak signal features.
I tend to shy away from the APF because its ringing seems to my ears to
be counter productive. Any advice/experience on how to set up and use
this feature for best results? Thanks.
...robert
--
Robert G Strickland, PhD
Best used when copy any other way is impossible due to a weak signal.
Ringing is somewhat better than noise, isn't it?
I've found APF useful in a number of QRP events, when handling weak
signals is the order of the day. Yes - copy may be dificult but at
least you have something to work with.
I should have mentioned that APF is set the way it's set. I don't
believe any parameters exist to change APF's operation. Someone may
correct me on this.
APF is best used with a narrow bandwidth setting. I think I saw the
figure 30 Hz (for -6dB points) used in conjunction with APF, so a 50
or
I work mostly CW weak signal and have not heard ringing with the K3 ..
Now I will say if you have your tones CW Pitch set at 800 Hz + or - it
may sound like ringing to you , you might try lowering the CW Pitch say
around 600 Hz or even lower
Ed N5DG
On 5/10/2013 7:36 PM, Matt Zilmer
I use 440 Hz and the APF almost full time, particularly for weak signal
work.
73 Don K5AQ
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Post:
Here's another approach to using APF on weak signals in an uncrowded band.
- Turn on NR set to 5m3. You can play with this but 5m3 seems to work
best here.
- Set the DSP bandwidth to 1 KHz. This is a good way to search for
weak signals you can't hear otherwise. The combination of NR and
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