[Elecraft] K2 - Isolation box construction for digital

[John R. Lonigro]

My metal isolation box shares ground with the computer.  That way I can 
use normal audio jacks and cables.  On the other side, I use a DB9 
connector to isolate the box from any wires going to the radio.  My PTT 
connection is isolated via an optoisolator (4N33), requiring another DB9 
to the computer serial port for control.   If you isolate the audio 
signals but not PTT, then you've again "un-isolated" everything.  If  
you use VOX for PTT, this isn't an issue.

73's, John AA0VE

Tim N9PUZ wrote:
> I would buy a) isolated jacks, b) mount regular jacks in plastic to 
> isolate them, or c) use an all plastic box to isolate them. That was 
> you don't have to remember to use a specially wired cable to preserve 
> the isolation.
>
> Tim, N9PUZ
>
>   
>