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Re: LF: Audio link

To: [email protected]
Subject: Re: LF: Audio link
From: DK7FC <[email protected]>
Date: Wed, 12 Oct 2016 21:01:46 +0200
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Hi Hugh,

But then the problem should be solved when placing the isolation audio transformer on the laptops end, so the wire does not act as an antenna. Did you try that?
Maybe grounding the laptop to the mains earth is another idea, but only when using the audio transformer.

73, Stefan

Am 12.10.2016 20:53, schrieb LineOne:
Hello Claudio.

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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