[Elecraft] K3 band data lines

Bill Frantz frantz at pwpconsult.com
Sun Feb 7 12:47:38 EST 2016


I have built a similar switch controller. If anyone wants a copy of the details, please ask.

Specifically: 

- Just connect te band lines directly to the Arduino inputs. It works fine.

- Don't know about cross band split. However K 3 power off and 60M look the same.

- I don't bother. I don't change bands while transmitting. I'm not sure if the K3 even supports it.

73 Bill AE6JV


On 2/7/16 at 3:38 AM, pf at tippete.net (Pierfrancesco Caci) wrote:

> Hello,
> I'm trying to make my own interface between the band data lines on the
> accessory connector of the K3 and the remote antenna switch. 
> I have a few questions that I hope you can help me with:
> 
> - is it safe to just poll the band lines with the arduino digital input
>   pins? I understand that my K3 is new enough to have the internal pull
>   up resistor. Should I put an isolation device inbetween? 
> 
> - does the band data as provided by the K3 always track the TX VFO?
>   Should I expect some weird situation if I ever try to do cross-band
>   split? 
> 
> - should I bother with asserting TX Inhibit and keep it set for a few
>   milliseconds when I detect a band switch?

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