Message-ID: <5ACA4335.2010100@posteo.de>
Date: Sun, 08 Apr 2018 18:28:37 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
References: <5AC8D995.2000309@posteo.de>,<162a195deeb-1796-6200@webjasstg-vab12.srv.aolmail.net> <6DB8451D7F3D3947A5918808A59621EA9052@servigilant.vigilant.local>
In-Reply-To: <6DB8451D7F3D3947A5918808A59621EA9052@servigilant.vigilant.local>
Subject: Re: VLF: EbNaut message attempt DL > VK7
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Thanks Luis,

In the stack, the timestamp is that of the latest transmission, here 
15:37:52.210... The message starts 19:20 UTC at the same day.
What do you get now?
And BTW the frequency offset must be 0, not 17470.1 Hz because it is a 
iq-file already centered to 17470.1 Hz, as shown in the decoder.

73, Stefan

Am 08.04.2018 11:57, schrieb VIGILANT Luis Fernández:
> Congratulations for the milestone achievement, Stefan and Edgar !! :-)
>
> I'm afraid we are getting used to this goals and consequently, loosing 
> scope of what it really means
> May be one can get a hint of it just if trying to follow Stefan's 
> path. At the moment just
> trying to Rx and decode EbNaut here
>
> I have decoded the message from my direct reception and found a unique 
> decode
> list rank 1448
> reference phase 0,0,0,0
> carrier S/N 10.36 dB in 108.5 uHz
>
> But when trying to decode from Edgard's file y find the file start is 
> from previous day (april 6th)
> file start time 2018-04-06 15:37:52.210
>
> That means the time offset is 315735.970 seconds and probably bypases 
> the duration of the file
> When running the decode just a lot of decodes at rank 0 :(
>
> What I'm doing wrong ??
>
> 73 de Luis
> EA5DOM
>
> ------------------------------------------------------------------------
> *De:* owner-rsgb_lf_group@blacksheep.org 
> [owner-rsgb_lf_group@blacksheep.org] en nombre de Markus Vester 
> [markusvester@aol.com]
> *Enviado:* sábado, 7 de abril de 2018 21:29
> *Para:* rsgb_lf_group@blacksheep.org
> *Asunto:* Re: VLF: EbNaut message attempt DL > VK7
>
> WOW! Just reproduced Stefan's one-character message from Edgar's file. 
> That's truly stunning!
>
> 73, Markus
>
>
> -----Ursprüngliche Mitteilung-----
> Von: DK7FC <selberdenken@posteo.de>
> An: rsgb_lf_group <rsgb_lf_group@blacksheep.org>
> Verschickt: Sa, 7. Apr 2018 16:51
> Betreff: Re: VLF: EbNaut message attempt DL > VK7
>
> Edgar, VLF,
>
> Thanks for providing the txt files again.
> It is amazing! The first day for the 1 char message stack was noisy. 
> Last night, the second day, the noise was 4 dB lower here. The first 
> day produced a carrier S/N of 3.78 dB, last night produced 7.16 dB. 
> The stack of these 2 days produces 8.09 dB!
>
> In the spectrum peak produced by Paul we can see a slight unsymmetry, 
> the left neighbour bin is stronger than the right neighbour bin. This 
> comes from the negative phase change that we can also see at NWC (19.8 
> kHz) from here. The more or less constant phase change during the 
> transmission is equal to a negative frequency offset, shifting some 
> energy in the left neighbour bin, which becomes already visible in 111 
> uHz. Thus i played a bit with a frequency offset in the EbNaut decoder 
> and found an ideal SNR of  8.30 dB (i don't tell the offset here for 
> those who like to find it selfe). Applying a frequency offset is valid 
> because there are public reasons to assume a frequency offset can help 
> to improve the SNR
>
> I started a decode attempt and got a decode of the correct message 
> already at phase 0/0/0/0. There were further decodes of the right 
> message but no false decode was shown. Best Eb/N0 is 2.7 dB, best rank 
> is 2058.
> When running the decoder without the frequency offset i'm getting even 
> better results, so forget what i said above :-) There are 3 decodes 
> all showing the correct message at convincing rank and Eb/N0.
>
> Unbelivable, we made it after 2 days, and one of them was very noisy! 
> This is all a bit fast to belive i seems. There must have been a 
> reason why SAQ is at 17.2 kHz.
>
> Time to learn the decoding process now. Let me attach the small wav 
> file for everyone here in the list. There are several EbNaut newcomers 
> who like tutorials to reproduce a decode :-)
> It is the first amateur radio message on VLF over such a 16805 km 
> distance! And a new distance record for EbNaut message decoding.
>
> Tonite:
>
> *f = 17470.1000 Hz
> Start time: 07.APR.2018  19:20:00 UTC (daily)
> Symbol period: 12 s
> Characters: 2
> CRC bits: 16
> Coding 16K21A
> Duration: 02:33:36 [hh:mm]
> Antenna current: 1000 mA
>
> *73, Stefan
>
>
>
> Am 05.04.2018 11:15, schrieb DK7FC:
>
>     Hi VLF,
>
>     Later we have to report about a spectacular success on the path
>     from DK7FC to Edgar J.T..
>     My daily carrier transmissions on 17470.1 Hz are now completed.
>
>     A new experiment will start today: A 1 character EbNaut message:
>
>     *f = 17470.1000 Hz
>     Start time: 05.APR.2018  19:20:00 UTC (daily)
>     Symbol period: 15 s
>     Characters: 1
>     CRC bits: 16
>     Coding 16K21A
>     Duration: 02:48 [hh:mm]
>     Antenna current: 1000 mA*
>
>     73, Stefan
>

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Thanks Luis, <br>
<br>
In the stack, the timestamp is that of the latest transmission, here
15:37:52.210... The message starts 19:20 UTC at the same day.<br>
What do you get now?<br>
And BTW the frequency offset must be 0, not 17470.1 Hz because it is a
iq-file already centered to 17470.1 Hz, as shown in the decoder.<br>
<br>
73, Stefan<br>
<br>
Am 08.04.2018 11:57, schrieb VIGILANT Luis Fern&aacute;ndez:
<blockquote
 cite="mid:6DB8451D7F3D3947A5918808A59621EA9052@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;">
  <div>Congratulations for the milestone achievement, Stefan and Edgar
!! :-)</div>
  <div><br>
  </div>
  <div>I'm afraid we are getting used to this goals and consequently,
loosing scope of what it really means</div>
  <div>May be one can get a hint of it just if trying to follow
Stefan's path. At the moment just</div>
  <div>trying to Rx and decode EbNaut here</div>
  <div><br>
  </div>
  <div>I have decoded the message from my direct reception and found a
unique decode</div>
  <div>
  <div>list rank 1448</div>
  <div>reference phase 0,0,0,0</div>
  <div>carrier S/N 10.36 dB in 108.5 uHz</div>
  </div>
  <div><br>
  </div>
  <div>But when trying to decode from Edgard's file y find the file
start is from previous day (april 6th)</div>
  <div>file start time 2018-04-06 15:37:52.210</div>
  <div><br>
  </div>
  <div>That means the time offset is&nbsp;315735.970 seconds and probably
bypases the duration of the file</div>
  <div>When running the decode just a lot of decodes at rank 0 :(</div>
  <div><br>
  </div>
  <div>What I'm doing wrong ??</div>
  <div><br>
  </div>
  <div>73 de Luis</div>
  <div>EA5DOM</div>
  <br>
  <div
 style="font-family: Times New Roman; color: rgb(0, 0, 0); font-size: 16px;">
  <hr tabindex="-1">
  <div id="divRpF553568" style="direction: ltr;"><font color="#000000"
 face="Tahoma" size="2"><b>De:</b> <a class="moz-txt-link-abbreviated" href="mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_group@blacksheep.org</a>
[<a class="moz-txt-link-abbreviated" href="mailto:owner-rsgb_lf_group@blacksheep.org">owner-rsgb_lf_group@blacksheep.org</a>] en nombre de Markus Vester
[<a class="moz-txt-link-abbreviated" href="mailto:markusvester@aol.com">markusvester@aol.com</a>]<br>
  <b>Enviado:</b> s&aacute;bado, 7 de abril de 2018 21:29<br>
  <b>Para:</b> <a class="moz-txt-link-abbreviated" href="mailto:rsgb_lf_group@blacksheep.org">rsgb_lf_group@blacksheep.org</a><br>
  <b>Asunto:</b> Re: VLF: EbNaut message attempt DL &gt; VK7<br>
  </font><br>
  </div>
  <div>
  <div
 style="font-size: 10pt; font-family: arial,helvetica,sans-serif; color: black;">
  <div
 style="color: black; font-family: arial,helvetica,sans-serif; font-size: 10pt;">WOW!
Just reproduced Stefan's one-character message&nbsp;from Edgar's file.
That's&nbsp;truly stunning!<br>
  <br>
73, Markus&nbsp;<br>
  <br>
  <br>
-----Urspr&uuml;ngliche Mitteilung----- <br>
Von: DK7FC <a class="moz-txt-link-rfc2396E" href="mailto:selberdenken@posteo.de">&lt;selberdenken@posteo.de&gt;</a><br>
An: rsgb_lf_group <a class="moz-txt-link-rfc2396E" href="mailto:rsgb_lf_group@blacksheep.org">&lt;rsgb_lf_group@blacksheep.org&gt;</a><br>
Verschickt: Sa, 7. Apr 2018 16:51<br>
Betreff: Re: VLF: EbNaut message attempt DL &gt; VK7<br>
  <br>
  </div>
  <div id="AOLMsgPart_1.2_15683722-f1bf-4134-8ae2-59404cde3799">
  <div class="aolReplacedBody" bgcolor="#ffffff">Edgar, VLF,<br>
  <br>
Thanks for providing the txt files again.<br>
It is amazing! The first day for the 1 char message stack was noisy.
Last night, the second day, the noise was 4 dB lower here. The first
day produced a carrier S/N of 3.78 dB, last night produced 7.16 dB. The
stack of these 2 days produces 8.09 dB!<br>
  <br>
In the spectrum peak produced by Paul we can see a slight unsymmetry,
the left neighbour bin is stronger than the right neighbour bin. This
comes from the negative phase change that we can also see at NWC (19.8
kHz) from here. The more or less constant phase change during the
transmission is equal to a negative frequency offset, shifting some
energy in the left neighbour bin, which becomes already visible in 111
uHz. Thus i played a bit with a frequency offset in the EbNaut decoder
and found an ideal SNR of&nbsp; 8.30 dB (i don't tell the offset here for
those who like to find it selfe). Applying a frequency offset is valid
because there are public reasons to assume a frequency offset can help
to improve the SNR<br>
  <br>
I started a decode attempt and got a decode of the correct message
already at phase 0/0/0/0. There were further decodes of the right
message but no false decode was shown. Best Eb/N0 is 2.7 dB, best rank
is 2058.<br>
When running the decoder without the frequency offset i'm getting even
better results, so forget what i said above :-) There are 3 decodes all
showing the correct message at convincing rank and Eb/N0.<br>
  <br>
Unbelivable, we made it after 2 days, and one of them was very noisy!
This is all a bit fast to belive i seems. There must have been a reason
why SAQ is at 17.2 kHz.<br>
  <br>
Time to learn the decoding process now. Let me attach the small wav
file for everyone here in the list. There are several EbNaut newcomers
who like tutorials to reproduce a decode :-)
  <br>
It is the first amateur radio message on VLF over such a 16805 km
distance! And a new distance record for EbNaut message decoding.<br>
  <br>
Tonite:<br>
  <br>
  <strong>f = 17470.1000 Hz<br>
Start time: 07.APR.2018&nbsp; 19:20:00 UTC (daily)<br>
Symbol period: 12 s<br>
Characters: 2<br>
CRC bits: 16<br>
Coding 16K21A<br>
Duration: 02:33:36 [hh:mm]<br>
Antenna current: 1000 mA<br>
  <br>
  </strong>73, Stefan<br>
  <br>
&nbsp;<br>
  <br>
Am 05.04.2018 11:15, schrieb DK7FC:
  <blockquote>Hi VLF, <br>
    <br>
Later we have to report about a spectacular success on the path from
DK7FC to Edgar J.T..
    <br>
My daily carrier transmissions on 17470.1 Hz are now completed.<br>
    <br>
A new experiment will start today: A 1 character EbNaut message:<br>
    <br>
    <strong>f = 17470.1000 Hz<br>
Start time: 05.APR.2018&nbsp; 19:20:00 UTC (daily)<br>
Symbol period: 15 s<br>
Characters: 1<br>
CRC bits: 16<br>
Coding 16K21A<br>
Duration: 02:48 [hh:mm]<br>
Antenna current: 1000 mA</strong><br>
    <br>
73, Stefan<br>
  </blockquote>
  </div>
  </div>
  </div>
  </div>
  </div>
  </div>
</blockquote>
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