It does.  I have used this setup for two field days.   Pay attention to the
menu setup of acc2 and ptt on the kx3 if memory serves me correctly.  From
my notes on field day setup:

If using an Elecraft kpa500, setup the kx3 so that the "pa key" is grounded
during ptt.  That means lo=ptt on the kx3 menus (ACC2 IO).

I figured this out by looking at the kpa500 manual.   I was borrowing a
fellow hams kpa500 so I can’t help more with testing as I don’t own one.

P.s.  I must have missed your original post because I did not see the post
you indicated you sent to the list.  Sometimes I get a bit delete happy :-)

Regards
Brian
VE3IBW

On Mon, Jul 30, 2018 at 10:11 AM Mark Goldberg <marklgoldb...@gmail.com>
wrote:

> I have asked if this will work, but did not get any answers. I suppose I
> could wire it up and see if it does.
>
> 73,
>
> Mark
> W7MLG
>
>
> On Mon, Jul 30, 2018 at 6:21 AM, ANDY DURBIN <a.dur...@msn.com> wrote:
>
> >
> >
> > KX3 has the option to output aux bus on ACC2 "TRN CTRL (output; XV-series
> > transverter control using Elecraft auxBus prototcol)".  Why wouldn't you
> > connect this directly to the aux bus input pin of the KPA500.  Isn't that
> > what it is for?
> >
> >
> >
> > Not discouraging Arduino projects though as I am going something similar
> > to integrate my TS-590 with KPA500 and KAT500.
> >
> >
> > 73
> >
> > Andy k3wyc
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