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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