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

[Joe Subich, W4TV]

1) we get a GPIO for this purpose,

I don't see how ... the K3 has only two (2) GPIO lines.  One is FSK
the other is the already overloaded pin 7 (transverter control/TX
Inhibit).

73,

    ... Joe, W4TV


On 9/4/2012 8:45 AM, Thomas Horsten wrote:
> 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
>>
>