Any combination of grounding wire, or no
wire, makes no difference, the QRM is directly radiated. If you see my
"shack" there's just enough room to sit by the desk so I can't
rearrange equipment any better. "Cosy" would be a nice description.
The laptop is usually OK but it is charged by time switch about every
2.5 hours and when fully charged, if the timer is still, on it can wipe
10 to 20dB s/n off the signal in spite of having a linear charger.
73, Hugh, M0DSZ
On 12/10/2016 15:37, Claudio Pozzi wrote:
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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