[Elecraft] KX3 AFX - Pitch Setting Enhancement ...?

[Grant Youngman]

I appreciate the clarification.  At least I’m not crazy this time :-)

I was hoping I’d stumbled on a bug that had been overlooked, rather than a “feature”.  Time marches on, and there may be little chance at this point of rewriting this option to follow CW PITCH.  Perhaps there could be a fixed selection of a small number of CW PITCH settings with appropriate filter parameters?  I think there are quite a few of us who prefer lower frequencies than the apparent default of 700 Hz for CW reception.

In any case, it works better on the KX3 than it does on the K3.  On the K3, the function seems to barely work, and requires a very high and unusable tuned pitch to give the sense of the signal being centered between the ears.  The overall effect (at least here) with AFX mode set to BIN, is that the right headphone has gone dead.  I had to convince myself the right channel was still working by switching AFX on and off several times or changing AFX to a Delay setting..  Virtually everything but very high pitches appear on the left.

Maybe I have some sort of hardware problem (?)  I think I discovered all of this very early on, but haven’t used the feature for some time, and my memory is old and short :-)

For anyone curious about binaural CW, the original description (at least the earliest I saw) was in QST 2/86.  (Took a while to find it again).  The method at that time used 4 or 8 pole analog elliptical filters (one LP, one HP).  Other versions using I/Q signals have come along also.  TT Orion's “Panoramic Stereo” mode used HP/LP filters plus time delays and was very effective, but I don’t recall if their implementation adjusted filter parameters to center the default CW tone setting either.  Haven’t had an Orion for a long time.  But on that radio I almost always used the feature on CW  … 

Grant NQ5T
K3 #2091 KX3 #8342

> On Aug 4, 2018, at 11:46 PM, Lyle Johnson <kk7p4dsp at gmail.com> wrote:
> 
> There are multiple AFX choices for the KX2/3 transceivers.
> 
> The PITCH selection uses a fixed set of filters for pitch mapping and as noted by the OP the center frequency does not follow the pitch setting.
> 
> At the time it was implemented we thought it worthwhile to include even if it didn't re-center based on the pitch setting.
> 
> 73,
> 
> Lyle KK7P
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