[Elecraft] Audio Ground Loop Isolation XFRMR?

[Jim Brown]

On Mon,9/19/2016 12:13 PM, Fred Jensen wrote:
> The K3 has isolation transformers on LINE IN/OUT.  You don't need to 
> add any more.

And THOSE transformers are unnecessary -- all that is needed is proper 
BONDING.

> I assume you're using the term "ground-loop problems" in the generic 
> [and somewhat archaic] sense.

Yes. Indeed, there is no such thing as a "ground loop" -- it's an 
entirely false concept.

> Make sure that you're not using the shield of any of the cables [RF or 
> AF] as the bond between your component's chassis' or enclosures. 

Right. That is NOT a bond. Indeed, part of the CAUSE of these hum/buzz 
problems is that the cable shield is NOT connected to the chassis at one 
or both ends.

> They should all be directly bonded together.  If isolating the shields 
> with external isolation transformers fixes the noise, that's a huge clue.

73, Jim K9YC