[Elecraft] [K3] GPIO input to switch output power with external amplifier on?

[Thomas Horsten]

I am wondering if anyone knows how the KXPA500 signals its state to the K3.
What cable is used to interconnect the two? There might already be a GPIO
on the extension connector that enables the alternative power settings on
the K3 on a per band basis.

Any info? Of course if there isn't wouldn't it be great if Wayne could add
it :)

73, Thomas M0TRN

On 29 August 2012 01:52, Vic K2VCO <k2vco.vic at gmail.com> wrote:

> I also have suggested this. I wrote a macro which toggles the DIGOUT1 line
> which I use to
> enable/disable my 'dumb' amplifier. The macro also switches between 100w
> and 65w, which is
> more or less what I use to drive the amplifier. But I would really like to
> have access to
> the per-band settings used for the KPA500.
>
> This feature is only available if you have a KPA500 now, but it shouldn't
> be hard to make
> it accessible to everyone.
>
> On 8/28/2012 4:41 PM, Thomas Horsten wrote:
> > Hi all,
> >
> > I know that the K3 can remember a separate power level for transmitting
> > with an intelligent external amplifier like the KPA500, but I have an old
> > boat-anchor amplifier which I switch in and out with a simple switch
> > connected to the KEY OUT line of the K3.
> >
> > Sometimes I am working barefoot on the K3 with 100W and then I decide I
> > need some extra power and turn on the amplifier. Then I have to turn the
> > drive down on the K3 to about 40W to drive the amplifier, but sometimes I
> > forget and the result is amplifier overdrive and burnt smell from the
> tubes.
> >
> > It would be very nice if there was an input on the K3 that would switch
> to
> > the alternative per-band memory for drive power. It might already be
> there
> > and used for the KPA500, but I couldn't find it in the manual.
> >
> > 73, Thomas M0TRN
>
>
> --
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco/
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