[Elecraft] [K2} KIO2 Noise pickup

[Brian Denley]

I have installed the KIO2 and setup the K2 for computer control and 
everything works well but I hear chuffing noise as the control software 
polls the K2 (if I shut off the polling, the noise stops).  It's not my 
sound card picking up the noise: if I don't connect the K2 audio output to 
the computer, I still hear the noise from the K2 speaker.  The noise is 
strongest on 80 meters, weak on 40 and not audible on higher bands.  Any 
tips for eliminating this type of noise?  Why did we not ground the KIO2 
cable at both ends?
Brian Denley
http://home.comcast.net/~b.denley/index.html