[Elecraft] Weird KIO3UPKT problem

[Fred Bennett]

Howdy folks...

I've been chasing this problem for a while thinking it was in my audio 
system.....but NO!! I use a laptop computer with an external HIFI audio 
board. The HIFI audio board drives a very nice amplified JBL speaker 
system with a subwoofer. The external audio board occupies one USB port 
on my laptop....when I plug the KIO3UPKT cord into any of the other 3 
USB ports on my laptop I get what sounds like 60 cycle hum out of my 
HIFI audio system. It doesn't matter which port I plug the HIFI audio 
interface into....as soon as the KIO3UPKT is plugged in I get the hum. 
The KIO3UPKT seems to function just fine in all other ways except for 
inducing this noise. Any ideas???


Stumped....   73...de   Fred  N9TA   Crawfordsville, IN.