Message-ID: <59072A14.9000605@posteo.de>
Date: Mon, 01 May 2017 14:29:08 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <579355A36AEE9D4FA555C45D556003AB8FDD5814@servigilant.vigilant.local>,<15bbecd3310-f86-eb79@webprd-a75.mail.aol.com> <579355A36AEE9D4FA555C45D556003AB8FDD5A80@servigilant.vigilant.local>
In-Reply-To: <579355A36AEE9D4FA555C45D556003AB8FDD5A80@servigilant.vigilant.local>
Subject: Re: LF: SL settings for EbNaut FFT recording ?
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Hi Luis,

What is the link to the grabber (again) please? Something with ure.es i 
think...

I would prefer to run the soundcard at 48 kS/s anyway because you will 
be able to run much more SL instances in parallel then. The number of 
parallel running instances can increase quickly :-)

8.9 hours for a FFT may be a bit to short though. It is not really a 
short distance so we may need all the time we can get to pass a first 
short message through. For a spectrogram it makes sense to try 47 uHz i 
would say.

Can you generate your own test signal on the MF antenna in 7 km 
distance? It should be possible to see a few 100V put on the TX antenna, 
so it is worth to experiment a bit. Maybe a microwave transformer from 
ebay or so. SpecLab can generate the tone/frequency. Use an available 
audio PA to drive the transformer, carefully. Could become your first DX 
on VLF! :-)

73, Stefan


Am 30.04.2017 20:49, schrieb VIGILANT Luis Fernández:
> Thank you very much Markus
>
> The .USR file is useful, but your detailed explanations are even 
> better to understand what's going on
> Would worth to add it to your EbNaut utilities
>
> So far so good. SL is "armed" and working on the next FFT in a few hours
> Yes. Patience is a must when you play with high integration FFTs. This 
> is not a game for nervous players ;-)
>
> I was using 192Khz sample rate but have changed to 48KHz to fit with 
> your decimation and FFT lenght
> The 1pps syncronization is working good and the SR is adjusted 
> properly. I get the NMEA via com port
> and system is reported by SL to be just few mili seconds from GPS
>
> All ready here to receive a transmission !
>
> 73 de Luis
> EA5DOM

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Hi Luis, <br>
<br>
What is the link to the grabber (again) please? Something with ure.es i
think...<br>
<br>
I would prefer to run the soundcard at 48 kS/s anyway because you will
be able to run much more SL instances in parallel then. The number of
parallel running instances can increase quickly :-)<br>
<br>
8.9 hours for a FFT may be a bit to short though. It is not really a
short distance so we may need all the time we can get to pass a first
short message through. For a spectrogram it makes sense to try 47 uHz i
would say. <br>
<br>
Can you generate your own test signal on the MF antenna in 7 km
distance? It should be possible to see a few 100V put on the TX
antenna, so it is worth to experiment a bit. Maybe a microwave
transformer from ebay or so. SpecLab can generate the tone/frequency.
Use an available audio PA to drive the transformer, carefully. Could
become your first DX on VLF! :-)<br>
<br>
73, Stefan<br>
<br>
<br>
Am 30.04.2017 20:49, schrieb VIGILANT Luis Fern&aacute;ndez:
<blockquote
 cite="mid:579355A36AEE9D4FA555C45D556003AB8FDD5A80@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;">Thank
you very much Markus
  <div><br>
  </div>
  <div>The .USR file is useful, but your detailed explanations are even
better to understand what's going on</div>
  <div>Would worth to add it to your EbNaut utilities</div>
  <div><br>
  </div>
  <div>So far so good. SL is "armed" and working on the next FFT in a
few hours</div>
  <div>Yes. Patience is a must when you play with high integration
FFTs. This is not a game for nervous players ;-)</div>
  <div><br>
  </div>
  <div>I was using 192Khz sample rate but have changed to 48KHz to fit
with your decimation and FFT lenght</div>
  <div>The 1pps syncronization is working good and the SR is adjusted
properly. I get the NMEA via com port</div>
  <div>and system is reported by SL to be just few mili seconds from
GPS&nbsp;</div>
  <div><br>
  </div>
  <div>All ready here to receive a transmission !</div>
  <div><br>
  </div>
  <div>73 de Luis</div>
  <div>EA5DOM&nbsp;</div>
  </div>
</blockquote>
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