Loop is absolutely the wrong way to view this problem, and transformers
are NOT the easiest or cheapest solution.
The solution is 1) proper chassis-to-chassis BONDING between all of the
equipment being interconnected and 2) get power for all of the
interconnected equipment from the same mains outlet, or from outlets
that share the same "green wire" (what is called the "protective earth"
in Europe).
73, Jim K9YC
. On Wed,8/31/2016 1:58 AM, Andrew Hebden wrote:
This sounds like a 'hum loop' problem, the scourge of audio enthusiasts.
In effect there are two earth connections between the KX3 and PC and it
forms a small loop aerial where by it picks up mains interference. You could
try running the cables from the KX3 to the PC very close together.
It doesn't affect most people but I did get this problem a bit ago, but not
with my KX3. The solution for me was to fit two small audio isolation
transformers (one for each channel) in the IQ line, fitted in a small
project box, and the problem went away. This has long been the recommended
procedure for most audio lines between a PC and a rig.
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