Message-ID: <5BB90378.6010102@posteo.de>
Date: Sat, 06 Oct 2018 20:48:24 +0200
From: DK7FC <selberdenken@posteo.de>
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In-Reply-To: <CANA3B6U_6C8sQNYrC5gZF=B6=aMgjrLk5St0GBCOxEO0eQXDkg@mail.gmail.com>
Subject: Re: VLF: IW4DXW 8270.003 Hz
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Hi Riccardo,

Am 06.10.2018 18:13, schrieb Riccardo Zoli:
> The experiment will be portable with a very simple equipment: a 12V 
> 60Ah lead-acid battery (pretty heavy, but i'm considering to buy a 
> LiFePO4 battery pack) and a 200W car audio PA with input connected to 
> a FM RX (QRG in the 70 cm band, no WLAN audio streaming and stuff).
> 400 meters away, at home, I have the FM TX (500 mW or less) modulated 
> by the PC audio. The feedback for Spectrum Lab will be taken from a 
> little loop (or my main antenna). Do you think that would work?
Hmm, sounds not convincin to me. I would favour a local PC, notebook, 
tablet or so, running SpecLab and a GPS module. With 60 Ah you can 
transmit for just a short time anyway.
Is there no chance to feed a cable from the house to the guide rail, if 
the distance is just 400m?
I would not work out a complete system before knowing the guide rails 
are working at all. Before buying expensive big wire, i would use a thin 
one and determine the ground losses first. Later you can work out more. 
The ideas will come with the practice...:-)
> Tomorrow, wx permitting, I'll measure the impedance of the ground loop.
At DC? Better use 2 or 3 batteries in series.
Looking forward to first signals.

73, GL, Stefan


>
>
> 73 de Riccardo IW4DXW
>
>
>
>
> Il Sab 6 Ott 2018, 17:09 DK7FC <selberdenken@posteo.de 
> <mailto:selberdenken@posteo.de>> ha scritto:
>
>     Hi Riccardo,
>
>     I also got your 06:30 transmission:
>
>     found rank 0 ber 3.9497e-01 Eb/N0 0.9 M -1.385156938e-04 ph 5
>     150,150,150,150 [IW4DXW]
>     carrier phase: -3.4 deg
>     carrier Eb/N0: 0.9 dB
>     carrier Es/N0: -14.36 dB
>     carrier S/N: 16.25 dB in 43.4 uHz, -27.37 dB in 1Hz, -61.35 dB in
>     2.5kHz
>
>     73, Stefan
>
>
>
>     Am 05.10.2018 08:13, schrieb Riccardo Zoli:
>>
>>     A new transmission is starting at *06:30 UTC*.
>>
>>
>>     73 de Riccardo IW4DXW
>>
>>
>>     Il Gio 4 Ott 2018, 21:43 Riccardo Zoli <riccardozoli80@gmail.com
>>     <mailto:riccardozoli80@gmail.com>> ha scritto:
>>
>>
>>         Ok, Stefan, thanks. I'm ready:
>>
>>         *Start at 00:00 UTC (5 Oct)*
>>         *Coding 16K21A*
>>         *CRC 16*
>>         *20 sec/sym*
>>         *6 char*
>>         *Duration 6 h, 24 min*
>>         *
>>         *
>>         ...hoping the noise remains low.
>>
>>         73, Riccardo IW4DXW
>>

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Hi Riccardo,<br>
<br>
Am 06.10.2018 18:13, schrieb Riccardo Zoli:
<blockquote
 cite="mid:CANA3B6U_6C8sQNYrC5gZF=B6=aMgjrLk5St0GBCOxEO0eQXDkg@mail.gmail.com"
 type="cite">
  <div dir="auto">The experiment will be portable with a very simple
equipment: a 12V 60Ah lead-acid battery (pretty heavy, but i'm
considering to buy a LiFePO4 battery pack) and a 200W car audio PA with
input connected to a FM RX (QRG in the 70 cm band, no WLAN audio
streaming and stuff).
  <div dir="auto" style="font-family: sans-serif;">400 meters away, at
home, I have the FM TX (500 mW or less) modulated by the PC audio. The
feedback for Spectrum Lab will be taken from a little loop (or my main
antenna). Do you think that would work?</div>
  </div>
</blockquote>
Hmm, sounds not convincin to me. I would favour a local PC, notebook,
tablet or so, running SpecLab and a GPS module. With 60 Ah you can
transmit for just a short time anyway.<br>
Is there no chance to feed a cable from the house to the guide rail, if
the distance is just 400m?<br>
I would not work out a complete system before knowing the guide rails
are working at all. Before buying expensive big wire, i would use a
thin one and determine the ground losses first. Later you can work out
more. The ideas will come with the practice...:-)<br>
<blockquote
 cite="mid:CANA3B6U_6C8sQNYrC5gZF=B6=aMgjrLk5St0GBCOxEO0eQXDkg@mail.gmail.com"
 type="cite">
  <div dir="auto">
  <div dir="auto" style="font-family: sans-serif;">Tomorrow, wx
permitting, I'll measure the impedance of the ground loop.</div>
  </div>
</blockquote>
At DC? Better use 2 or 3 batteries in series.<br>
Looking forward to first signals.<br>
<br>
73, GL, Stefan<br>
<br>
<br>
<blockquote
 cite="mid:CANA3B6U_6C8sQNYrC5gZF=B6=aMgjrLk5St0GBCOxEO0eQXDkg@mail.gmail.com"
 type="cite">
  <div dir="auto">
  <div dir="auto" style="font-family: sans-serif;"><br>
  </div>
  <div dir="auto" style="font-family: sans-serif;"><br>
  </div>
  <div dir="auto" style="font-family: sans-serif;">73 de Riccardo IW4DXW</div>
  <div dir="auto" style="font-family: sans-serif;"><br>
  </div>
  <div dir="auto" style="font-family: sans-serif;"><br>
  </div>
  <br>
  </div>
  <br>
  <div class="gmail_quote">
  <div dir="ltr">Il Sab 6 Ott 2018, 17:09 DK7FC &lt;<a
 moz-do-not-send="true" href="mailto:selberdenken@posteo.de"
 target="_blank" rel="noreferrer">selberdenken@posteo.de</a>&gt; ha
scritto:<br>
  </div>
  <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
    <div bgcolor="#ffffff" text="#000000">Hi Riccardo, <br>
    <br>
I also got your 06:30 transmission:<br>
    <br>
found rank 0 ber 3.9497e-01 Eb/N0 0.9 M -1.385156938e-04 ph 5
150,150,150,150 [IW4DXW]<br>
carrier phase: -3.4 deg<br>
carrier Eb/N0: 0.9 dB<br>
carrier Es/N0: -14.36 dB<br>
carrier S/N: 16.25 dB in 43.4 uHz, -27.37 dB in 1Hz, -61.35 dB in 2.5kHz<br>
    <br>
73, Stefan<br>
    <br>
    <br>
    <br>
Am 05.10.2018 08:13, schrieb Riccardo Zoli:
    <blockquote type="cite">
      <div dir="auto">
      <div>
      <div dir="auto"><br>
      </div>
      <div dir="auto">A new transmission is starting at <b>06:30 UTC</b>.</div>
      <div dir="auto"><br>
      </div>
      <div dir="auto"><br>
      </div>
      <div dir="auto">73 de Riccardo IW4DXW</div>
      <br>
      <br>
      <div class="gmail_quote">
      <div dir="ltr">Il Gio 4 Ott 2018, 21:43 Riccardo Zoli &lt;<a
 moz-do-not-send="true" href="mailto:riccardozoli80@gmail.com"
 rel="noreferrer noreferrer" target="_blank">riccardozoli80@gmail.com</a>&gt;
ha
scritto:<br>
      </div>
      <blockquote class="gmail_quote"
 style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
        <div dir="auto">
        <div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">Ok, Stefan, thanks. I'm ready:</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto"><b>Start at 00:00 UTC (5 Oct)</b></div>
        <div dir="auto"><b>Coding 16K21A</b></div>
        <div dir="auto"><b>CRC 16</b></div>
        <div dir="auto"><b>20 sec/sym</b></div>
        <div dir="auto"><b>6 char</b></div>
        <div dir="auto"><b>Duration 6 h, 24 min</b></div>
        <div dir="auto"><b><br>
        </b></div>
        <div dir="auto">...hoping the noise remains low.</div>
        <div dir="auto"><br>
        </div>
        <div dir="auto">73, Riccardo IW4DXW</div>
        </div>
        </div>
      </blockquote>
      </div>
      </div>
      </div>
    </blockquote>
    </div>
  </blockquote>
  </div>
</blockquote>
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