Message-ID: <5CF9695E.8020006@posteo.de>
Date: Thu, 06 Jun 2019 21:28:30 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <6DB8451D7F3D3947A5918808A59621EA31596319@servigilant.vigilant.local>,<5CF283CC.9010701@posteo.de> <6DB8451D7F3D3947A5918808A59621EA5BEB7DAC@servigilant.vigilant.local> <5CF57C41.7020008@posteo.de> <6DB8451D7F3D3947A5918808A59621EA5BEB9071@servigilant.vigilant.local>,<5CF75AE7.8080103@posteo.de> <6DB8451D7F3D3947A5918808A59621EA5BEBAD4F@servigilant.vigilant.local>,<5CF907FC.803@posteo.de> <6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local>
In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local>
Subject: Re: LF: Re: EbNaut considerations for tomorrow...
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Hi Luis

Am 06.06.2019 21:08, schrieb VIGILANT Luis Fernández:
> The variometer, coil, vertical section and topload hat is all 
> connected to the inner of the coax
> Coax ground is connected to the metal pipe which runs inside the 
> building to the basement
Oh this is not ideal and it may rise the QRM and lowers the signal 
levels significantly. How long is the cable?

> The coax cable in the shack is connected to the audio transformer. The 
> other side of the audio
> transformer is directly connected to PC soundcard
RR. I suggest to put the transformer on the roof and connect the antenna 
there. Then the shack earth is decoupled from the 'roof earth' ;-)

> Measured at 10KHz. From about -110dB with antenna it drops to -135dB 
> without antenna
That is very good! Anyway, putting the transformer to the roof may lower 
the QRM.

> Yes. I'm doing that. Let's see what can I get
RR, GL, 73, Stefan

>
> 73 de Luis
>
> EA5DOM
>>
> There is a coax cable from the roof to shack. No transformers at the 
> antenna

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Hi Luis<br>
<br>
Am 06.06.2019 21:08, schrieb VIGILANT Luis Fern&aacute;ndez:
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local"
 type="cite">
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">
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  <div>The variometer, coil, vertical section and topload hat is all
connected to the inner of the coax</div>
  <div>Coax ground is connected to the metal pipe which runs inside the
building to the basement</div>
  </div>
  </div>
  </div>
</blockquote>
Oh this is not ideal and it may rise the QRM and lowers the signal
levels significantly. How long is the cable?<br>
<br>
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local"
 type="cite">
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">
  <div>
  <div
 style="font-family: Times New Roman; color: rgb(0, 0, 0); font-size: 16px;">The
coax cable in the shack is connected to the audio transformer. The
other side of the audio
  <div>transformer is directly connected to PC soundcard</div>
  </div>
  </div>
  </div>
</blockquote>
RR. I suggest to put the transformer on the roof and connect the
antenna there. Then the shack earth is decoupled from the 'roof earth'
;-) <br>
<br>
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local"
 type="cite">
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">
  <div>
  <div
 style="font-family: Times New Roman; color: rgb(0, 0, 0); font-size: 16px;">Measured
at 10KHz. From about -110dB with antenna it drops to -135dB without
antenna</div>
  </div>
  </div>
</blockquote>
That is very good! Anyway, putting the transformer to the roof may
lower the QRM.<br>
<br>
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local"
 type="cite">
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">
  <div>
  <div
 style="font-family: Times New Roman; color: rgb(0, 0, 0); font-size: 16px;">
  <div>Yes. I'm doing that. Let's see what can I get<br>
  </div>
  </div>
  </div>
  </div>
</blockquote>
RR, GL, 73, Stefan<br>
<br>
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA5BEBBACC@servigilant.vigilant.local"
 type="cite">
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  <div><br>
73 de Luis</div>
  <br>
  <div>EA5DOM</div>
  <div>
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There is a coax cable from the roof to shack. No transformers at the
antenna
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