[Elecraft] CW keying

[Don Wilhelm]

The only reason to use optical coupling is to isolate the computer ground
from the K2 chassis (or use a fast relay to do the same thing).

If connecting the keyline from the computer to the K2 introduces additional
noise during receive, add the optical coupling.

73,
Don W3FPR

> -----Original Message-----
>
> Thanks Joe!
>
> That's simple enough. Just about right for my level!  :-)
>
> Is there any reason in practice to use optic coupling versus
> direct keying?
> I'm going to use it for a K2 and never ever going to upgrade to K2/100
> or using an amplifier.
>
> de Håkan
>
>
>
> Joe-aa4nn wrote:
> > You can look at the pinout for LPT1 at
> > http://www.k1ea.com/hints/lpt.htm
> > Also look at the pictorial at http://www.n3fjp.com/  under CW-PC
> > Interface.
> > de Joe, aa4nn
>