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

[Thomas Horsten]

Thanks for the answers Joe.

So I guess there are 3 options, 1) we get a GPIO for this purpose, 2)
reverse-engineer the serial protocol and built a little interface box, 3)
Elecraft releases details about the protocol used. I'd sure prefer number 1
if it was possible.

73, Thomas M0TRN

On 4 September 2012 13:40, Joe Subich, W4TV <lists at subich.com> wrote:

> On 9/4/2012 8:29 AM, Thomas Horsten wrote:
> > I am wondering if anyone knows how the KXPA500 signals its state to
> > the K3.
>
> Per previous information, proprietary serial protocol on pin 2 (AUX
> bus).
>
>  > What cable is used to interconnect the two?
>
> 15 pin HD - KPAK3AUX.  see:
> http://www.elecraft.com/manual/KPAK3AUX%20Cable%20Set%20Instructions.pdf
>
>  > There might already be a GPIO
>
> No - read the K3 Owner's manual for a description of the GPIO signals
> on the ACC connector.
>
> 73,
>
>     ... Joe, W4TV
>