Message-ID: <5A9955A2.1070003@posteo.de>
Date: Fri, 02 Mar 2018 14:46:10 +0100
From: DK7FC <selberdenken@posteo.de>
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Subject: Re: VLF: DK7FC > W1VD 8.27 kHz EbNaut more success!
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Update:
4 files are now available for stacking in that experiment. The noise has 
been higher in the recent days, or there are some technical problems, or 
changing daily phases (propagation), that's uncertain.
Jay provides the files for analysis here. I'm in an advanced position 
because i know the correct message already. So i can run the decoder on 
a list length as large as the PC can handle and search for the correct 
message thereafter. Oh and i can reconstruct the carrier and its 
spectrum peak and see if it is growing daily. Still no sign of the 
message here but i can see a growing peak. That's exciting...

Hopefully tomorrow will show up something.

73, Stefan


Am 25.02.2018 23:17, schrieb DK7FC:
> Hi Jay, VLF,
>
> A great success again! Thanks for your efforts on the RX side. And 
> congrats to that result!
> It was exciting and interesting to follow the rising Eb/N0 and the 
> daily variations when using the -f16 function in the Linux decoder.
> It can be quite an effort to tweak out the last 0.05 dB in the hope to 
> find the correct message then, by varying time offsets and weighting. 
> I am learning a bit more each time i follow the decode process here on 
> the TX side by analysing the wav files you kindly provided.
>
> We are now leaving the winter season. The QRN has been clearly 
> stronger during the last nights. There are regular thunderstorms in 
> south Italy and Greece now.
>
> A longer message is realistic. Let us try 5 characters now:
>
> *f = 8270.1000 Hz
> Start time: 25.FEB.2018  22:30:00 UTC (daily)
> Symbol period: 24 s
> Characters: 5
> CRC bits: 18
> Coding 16K21A
> Duration: 07:15:12 [hh:mm:ss]
> Antenna current: 700 mA*
>
> I bet you will get the result after 4 days of stacking! Let's see! 
> Good luck!
>
> 73, Stefan

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Update:<br>
4 files are now available for stacking in that experiment. The noise
has been higher in the recent days, or there are some technical
problems, or changing daily phases (propagation), that's uncertain. <br>
Jay provides the files for analysis here. I'm in an advanced position
because i know the correct message already. So i can run the decoder on
a list length as large as the PC can handle and search for the correct
message thereafter. Oh and i can reconstruct the carrier and its
spectrum peak and see if it is growing daily. Still no sign of the
message here but i can see a growing peak. That's exciting...<br>
<br>
Hopefully tomorrow will show up something.<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 25.02.2018 23:17, schrieb DK7FC:
<blockquote cite="mid:5A9335F5.609@posteo.de" type="cite">
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Hi Jay, VLF,<br>
  <br>
A great success again! Thanks for your efforts on the RX side. And
congrats to that result!<br>
It was exciting and interesting to follow the rising Eb/N0 and the
daily variations when using the -f16 function in the Linux decoder.<br>
It can be quite an effort to tweak out the last 0.05 dB in the hope to
find the correct message then, by varying time offsets and weighting. I
am learning a bit more each time i follow the decode process here on
the TX side by analysing the wav files you kindly provided.<br>
  <br>
We are now leaving the winter season. The QRN has been clearly stronger
during the last nights. There are regular thunderstorms in south Italy
and Greece now.<br>
  <br>
A longer message is realistic. Let us try 5 characters now:<br>
  <br>
  <strong>f = 8270.1000 Hz<br abp="2715">
Start time: 25.FEB.2018  22:30:00 UTC (daily)<br abp="2716">
Symbol period: 24 s<br abp="2717">
Characters: 5<br abp="2718">
CRC bits: 18<br abp="2719">
Coding 16K21A<br abp="2720">
Duration: 07:15:12 [hh:mm:ss]<br abp="2721">
Antenna current: 700 mA</strong><br>
  <br>
I bet you will get the result after 4 days of stacking! Let's see! Good
luck!<br>
  <br>
73, Stefan</blockquote>
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