[Elecraft] Audio artifacts in DATA A mode with KX3

Tue Jan 3 16:46:12 EST 2017

Thank you, Wayne!  At least we know we're not crazy :-)

   Nick / N6OL

On 3 January 2017 at 13:45, Wayne Burdick <n6kr at elecraft.com> wrote:

> This is on the KX3 firmware list. I'll move it up a notch.
>
> Wayne
> N6KR
>
>
> On Jan 3, 2017, at 12:16 AM, David Anderson via Elecraft <
> elecraft at mailman.qth.net> wrote:
>
> > Nick,
> >
> > Thank you for bringing this up.
> >
> > I never did get a satisfactory explanation, I contacted support too but
> that didn't get me anywhere either, I don't think they understood my
> question, which is quite simple really, why can't we get the same bandwidth
> in Data mode as in SSB mode? I think it's a simple oversight, but nobody
> seemed interested in acknowledging it or fixing it.
> >
> >
> > 73 from David GM4JJJ
> >
> >> On 2 Jan 2017, at 23:54, Nicklas Johnson <nick at n6ol.us> wrote:
> >>
> >> Jörg in the Elecraft KX3 group on Facebook had an interesting
> observation:
> >> with WJST's waterfall, if the "flatten" mode is on, it produces some
> >> unusual artifacts in the presence of sharp spectrum drop-offs, and
> indeed
> >> if I turn off the "flatten" feature and manually set the zero point for
> the
> >> waterfall, the artifacts go away.
> >>
> >> It's still an open question as to why the data-a mode has a steep
> drop-off
> >> at 400Hz when the PBT settings on the rig would seem to indicate
> otherwise,
> >> and the same drop-off isn't there in USB mode.
> >>
> >> I see searching on "400 Hz" that GM4JJJ had the same question here on
> the
> >> last back in July 2015, but never really got an answer.  I basically
> have
> >> the same question as this one:
> >> https://www.mail-archive.com/[email protected]/msg183837.html
> >>
> >>  Nick
> >>
> >>
> >>> On 2 January 2017 at 12:06, Nicklas Johnson <nick at n6ol.us> wrote:
> >>>
> >>> I'm seeing some unexpected audio artifacts when using DATA A mode with
> the
> >>> latest production firmware on my KX3, on all bands.  This is something
> I
> >>> observe when the PBT BW is set all the way wide (4KHz) and FC is
> centered.
> >>>
> >>> In DATA mode, there's an audio drop-off between 200 and 325 Hz, with an
> >>> almost completely dead audio "hole" between 250 and 300 Hz.  Then
> there's
> >>> some additional noise between 350 and 500 Hz.
> >>>
> >>> If I switch to USB mode (with no EQ or audio effects applied,
> naturally),
> >>> all of these artifacts go away, and it's perfectly smooth across the
> >>> spectrum.  No drop-off, no noise.
> >>>
> >>> Pictures of the waterfalls for comparison here:
> http://imgur.com/a/AjHu4
> >>>
> >>> Am I doing something wrong, or is there something I should check?  I've
> >>> taken the usual steps, but it's plausible I've missed something.
> >>>
> >>>    Nick
> >>>
> >>> --
> >>> *N6OL*
> >>> Saying something doesn't make it true.  Belief in something doesn't
> make
> >>> it real. And if you have to lie to support a position, that position
> is not
> >>> worth supporting.
> >>>
> >>
> >>
> >>
> >> --
> >> *N6OL*
> >> Saying something doesn't make it true.  Belief in something doesn't
> make it
> >> real. And if you have to lie to support a position, that position is not
> >> worth supporting.
> >> ______________________________________________________________
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> >
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>

-- 
*N6OL*
Saying something doesn't make it true.  Belief in something doesn't make it
real. And if you have to lie to support a position, that position is not
worth supporting.