Message-ID: <5BA0AA84.9080905@posteo.de>
Date: Tue, 18 Sep 2018 09:34:28 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <6DB8451D7F3D3947A5918808A59621EA08620F78@servigilant.vigilant.local>
In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA08620F78@servigilant.vigilant.local>
Subject: Re: LF: LF EbNaut transmission anouncement
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Luis,

I further analysed the files from your transmission. The best SNR i'm 
getting (assuming the message is 'DOM') is 9.07 dB from the 2 UTC 
transmission. We need about 4 dB more S/N, i.e. a lower noise or 0.3 W 
TX power :-) With 1 W it should be possible to decode your complete 
callsign! The SNR peaked at a time offset of -0.5 seconds and a 
frequency offset of -30 uHz, but that does not tell to much at this low 
SNR, maybe.

Worth to try again!

73, Stefan

Am 13.09.2018 21:43, schrieb VIGILANT Luis Fernández:
> Hi EbNaut
>
> I will be transmiting an EbNaut message in LF with about 100mW to 
> antenna (not ERP)
> during the next 24 h al least
>
> Frequency: 137.485Hz
>
> Transmissions already started at 19:30 UTC and will repeat twice every 
> hour at minute 00 and 30
>
> Coding: 16K21A
> CRC: 16
> Symbol: 2
> Characters: 3
>
> Number of bits:864
> Duration: 00:28:48
>
> Reports wellcome. Let's se what can be donde with really low power
>
> 73 de Luis
> EA5DOM
>

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Luis, <br>
<br>
I further analysed the files from your transmission. The best SNR i'm
getting (assuming the message is 'DOM') is 9.07 dB from the 2 UTC
transmission. We need about 4 dB more S/N, i.e. a lower noise or 0.3 W
TX power :-) With 1 W it should be possible to decode your complete
callsign! The SNR peaked at a time offset of -0.5 seconds and a
frequency offset of -30 uHz, but that does not tell to much at this low
SNR, maybe.<br>
<br>
Worth to try again!<br>
<br>
73, Stefan<br>
<br>
Am 13.09.2018 21:43, schrieb VIGILANT Luis Fern&aacute;ndez:
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA08620F78@servigilant.vigilant.local"
 type="cite">
  <meta http-equiv="Content-Type"
 content="text/html; charset=ISO-8859-1">
  <style type="text/css" id="owaParaStyle"></style>
  <div
 style="direction: ltr; font-family: Tahoma; color: rgb(0, 0, 0); font-size: 10pt;">Hi
EbNaut
  <div><br>
  </div>
  <div>I will be transmiting an EbNaut message in LF with about 100mW
to antenna (not ERP)</div>
  <div>during the next 24 h al least</div>
  <div><br>
  </div>
  <div>Frequency: 137.485Hz</div>
  <div><br>
  </div>
  <div>Transmissions already started at 19:30 UTC and will repeat twice
every hour at minute 00 and 30</div>
  <div><br>
  </div>
  <div>Coding: 16K21A</div>
  <div>CRC: 16</div>
  <div>Symbol: 2</div>
  <div>Characters: 3</div>
  <div><br>
  </div>
  <div>Number of bits:864</div>
  <div>Duration: 00:28:48</div>
  <div><br>
  </div>
  <div>Reports wellcome. Let's se what can be donde with really low
power</div>
  <div><br>
  </div>
  <div>73 de Luis</div>
  <div>EA5DOM</div>
  <div><br>
  </div>
  </div>
</blockquote>
</body>
</html>

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