Stephen is correct.
Several of us lobbied for an APF feature shortly after the K3 debuted in
2007, drawing on our experiences with the FT-1000D. There /were/ two
firmware versions that Wayne developed, and the consensus among some of
us was that the first one was better than the second. As I recall, the
second version cleaned up some artifacts and unintended consequences,
but, we felt, at the cost of diminished "peaking." Wayne was adamant
that the APF part of the code was not touched. We eventually chalked up
the difference between the two versions to subjectivity among the
testers and left it at that.
Barry, by the way, is also correct in saying there were two versions of
the APF circuit in the FT-1000D over the years. It has been the
consensus of owners that the earlier version was superior to the later
version.
The APF in both the K3 and KX3 is excellent, in my opinion.
73,
Kent K9ZTV
K3/KX3 s.n. 21
On 2/5/2016 10:03 AM, Stephen Prior wrote:
I've seen it written that it helps to offset the IF slightly, although to
be honest I have never myself got the APF to work to my satisfaction.
Oddly, and I communicated with Wayne about this at the time, the first beta
(I think) implementation of it was stunning, but a later release lost it
for me. Wayne told me there had been no change in code, but I have never
understood that.
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