[Elecraft] [K3] Wetting current and CW paddles

[CUTTER DAVID]

Sliding off topic a little: in designing some outdoor industrial control equipment I was required to use some chunky, robust push buttons that were good for high voltage, high current but no good at 12V. Getting to logic level I had to build in a lot of extra current from 12V to ensure a good switch over, I think some 30mA or so.

Using a favourite pre-war Morse key on vintage valve gear, it worked perfectly, but on modern solid state equipment it was very intermittent and I didn't want to make an interface. Solution, clean the contacts. Conclusion: modern gear needs better contacts than the old stuff.

David G3UNA/G6CP

> On 15 October 2020 at 15:19 dl2ki <dl2ki at darc.de mailto:dl2ki at darc.de > wrote:
> 
> 
>     Hi,
> 
>     i posted the article here for discussion, because I can't judge it myself.
> 
>     I think that Elecraft had a little idea to design the keyer electronics of
>     the K3 as it is.
> 
>     Interesting is the difference to the K2, where the resistors R1 and R2 were
>     changed in revision "B". Again I can't judge if this had anything to do with
>     this topic.
> 
>     OK, I'll just leave it like this. Maybe somebody will have some experience
>     with it after all.
> 
>     Thanks a lot
>     Wolfgang, DL2KI
> 
> 
> 
> 
>     --
>     Sent from: http://elecraft.365791.n2.nabble.com/
>     ______________________________________________________________
>     Elecraft mailing list
>     Home: http://mailman.qth.net/mailman/listinfo/elecraft
>     Help: http://mailman.qth.net/mmfaq.htm
>     Post: mailto:Elecraft at mailman.qth.net mailto:Elecraft at mailman.qth.net
> 
>     This list hosted by: http://www.qsl.net
>     Please help support this email list: http://www.qsl.net/donate.html
>     Message delivered to d.cutter at ntlworld.com mailto:d.cutter at ntlworld.com
>