[Elecraft] Audio Ground Loop Isolation XFRMR?

[Jim Brown]

On Mon,9/19/2016 9:24 AM, dw wrote:
> I have a switch-box at my station which allows me to switch back and
> forth between the K3 audio and PC audio.
> This allows me to have SDR running on the PC and I can also listen to
> the K3 in one ear and the PC in the other.
>
> Any way, I've been experiencing ground-loop noise from my PC.
> I've tried three different isolation transformers and they all work, but
> with significant signal loss from the PC.
> Does anyone have a suggestion?

Yes. NO transformer is needed. What IS needed is 1) simple bonding 
together of the chassis of all the equipment in your shack, bonding that 
to all the other grounds in your home; and 2) get power for all of the 
equipment in your shack from the same AC outlet, or from outlets whose 
green wires are bonded together.

Study  http://k9yc.com/GroundingAndAudio.pdf

73, Jim K9YC