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

[Bob McGraw K4TAX]

With AFX utilized there is phase shift between left and right audio 
channels.   I don't seem to think it is constant phase shift, therefore 
changes with frequency.  This enhances the bi-aural effect of AFX.   In 
the hearing, thus two sources of the same signal, the leading phase will 
be the leading direction or location.   As the phase changes with 
frequency then the source will appear to change accordingly.   This is 
the way the ear determines direction of a sound in the distance.  If the 
sound arrives at the right ear first, then the sound source is 
determined to be from the right.   Likewise for sound arriving to the 
left ear first, the source is to the left.

Just my take from an old deaf recording studio engineer.

73

Bob, K4TAX


On 8/4/2018 9:33 PM, Grant Youngman wrote:
> Wayne ..
>
> This is the only feature that I’ve found not adjusting properly to the CW PITCH setting … I think everything else works like it’s supposed to.
>
> I just went out — doing battle with coastal gnats and other gnawing insects inhabiting my patio :-) — and tried it again.   (There needs to be a bath soap with DEET in it).
>
> Narrowing the receive bandwidth has no effect on sound field centering.  A CW PITCH of 700 Hz will center right between the ears when the signal is tuned.  With CW PITCH at 500 Hz, it is ALWAYS off to the left and does not center at either wide or narrow bandwidths.  When tuning across a signal it slides from right to left (or vice versa) as the signal’s pitch changes like you’d expect.  When tuned, however,  it won’t center unless CW PITCH is at 700 Hz.
>
> Grant NQ5T
>
>> On Aug 4, 2018, at 9:54 PM, Wayne Burdick <n6kr at elecraft.com> wrote:
>>
>> Grant,
>>
>> The KX3's filter center frequency for all features tracks the sidetone pitch exactly. To change the sidetone and filter pitch, just hold the PITCH switch and rotate the knob above it.
>>
>> If you set PITCH to 500 Hz, for example, then the regular filters, APF (audio peaking filter), CWT (CW tuning aid), manual spot, autospot, and CW decode will all be centered at 500 Hz.
>>
>> Regarding your *exact* question (I think): all of the AFX features should also be centered at the selected PITCH. The only exception is if you have a wide filter passband selected. For example, if your PITCH is 500 Hz and you have a filter WIDTH of something greater than about 1000 Hz, then the passband center starts shifting higher. The lower edge of the filter remains near zero beat + 100 Hz to ensure good opposite-sideband rejection at all WIDTH settings.
>>
>> 73,
>> Wayne
>> N6KR
>>
>>> On Aug 4, 2018, at 12:46 PM, Grant Youngman <ghyoungman at gmail.com> wrote:
>>>
>>> One of the reasons I never use this setting is that it seems to be a fixed 700 Hz +/- as “center” in the sound field.  I much prefer CW closer to 500 Hz, which always ends up putting the tuned signal in my left ear with this option (and no I’m not terribly hard of hearing in this frequency range).
>>>
>>> Have I missed another setting option somewhere?  If not, it would be a worthwhile KX3 (and K3?) enhancement to have the AFX Pitch “center” follow the CW Pitch setting of the radio to actually make this function useful.
>>>
>>> The CW Binaural option on the TT Orion opened up a very spacious left-right soundstage that made it easy to copy a “centered” CW signal in crowded band conditions even at wider filter settings. You could literally point to every signal …
>>>
>>> My K3 isn’t hooked up right now (shack is currently a table on my patio), so I’m not sure if it behaves the same way.  In any case redoing the AFX Pitch algorithm would be a very worthwhile enhancement.
>>>
>>> Grant NQ5T
>>> K3 #2091 KX3 #8342
>>>
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