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

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