[Elecraft] K3 APF Effectiveness

[Igor Kosvin]

Sure, you are right, but you would not deny that using same set of
parameters (NR/NB, WIDTH, PITCH, RF, etc) the APF circa 4.17 and 4.22 should
give very similar results since the code of APF remains the same. After
playing few days with 4.22 I find myself having to turn off APF to better
receive weak CW stations. I don't have explanation for this. With APF on I
find it difficult to distinguish dits and dahs of weak signals. With 4.17 it
was much better for me. That should be apples-to apples comparison, I think.
I don't claim to be expert though, listening is very subjective IMHO.

Regards,

Igor, N1YX

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of wb6rse1 at mac.com
Sent: Wednesday, November 17, 2010 3:10 PM
To: Elecraft Reflector
Subject: [Elecraft] K3 APF Effectiveness

There are many variables at work with regard to judging the effectiveness of
the K3 APF. In addition to the discussions of noise and careful tuning,
there are user preferences to consider:

1) Headphones vs speakers
2) Enhancing a weak signal to "pop up" that would otherwise be copyable with
adjustment of NR, NB, bandwidth/shift and/or the use of diversity RX.
3) Enhancing a truly weak signal that would otherwise be impossible to copy.

When commenting on the effectiveness of the APF, it would be useful to know
what other of the K3's tools are in use and how they are adjusted.

73 - Steve WB6RSE
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