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On Tuesday 11 October 2016 20:38:07 you wrote:
> To avoid having laptop running in the shack, which occasionally
> produces some QRM, I can send received audio from the shack to a
> desktop computer in the house on a twisted telephone pair. This works
> but any wire connection between shack and this desktop introduces some
> spurious signals on 136khz even if I use an audio isolating transformer.
>
The AC 230 power supply in the shack and the desktop computer grounding wire are equipotential, share the same grounding system?
73 de Claudio ik2pii
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