From: DK7FC <73dk7fc@googlemail.com>
Message-ID: <58DD3F2E.4050509@gmail.com>
Date: Thu, 30 Mar 2017 19:23:58 +0200
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To: "rsgb_lf_group@blacksheep.org" <rsgb_lf_group@blacksheep.org>
References: <15b1492292b.marcocadeddu@tin.it> <CAC+C6w62sYuCa58cYbVoNgNx9Nc8+QpQQ8489qjs7U2wymv6Gw@mail.gmail.com> <58DC1D12.2070405@gmail.com> <1490890636.646895841@f243.i.mail.ru>
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Subject: Re: LF: vlf ebnaut 29 Mar 2017
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Hello Alex,

Thank you, the message is correct! :-) Very well! And 1990 km during the 
relatively high QRN!
But Eb/N0 = -0.3 dB, that's quite close to the limit. On the other side 
the transmission just took 7 hours, so we wasted 3...4 hours. But our 
recent idea to try 10 characters will be much harder now.

There will be more signals soon. With some luck, RC4HAA will be ready 
for the weekend.

73, Stefan


Am 30.03.2017 18:17, schrieb rn3aus@gmail.com:
> Hello Stefan, VLF
> I have a decode. I hope it is not false ;)
> The best result is achieved with the small frequency offset, however 
> decode is possible also without it.
> Some phase variations are noticeable. Perhaps night is too short now 
> and we need to use day time for transmission?
> As usualy files for reprocessing are here: 
> http://rn3aus.narod.ru/ebnaut-vlf-29mar2017.zip
>
> My grabber is running, next visit on Monday...
>
> ebnaut-rx V0.5
> input file C:\TEMP\ebnaut29_MAR_2156_8270-1pps.wav
> sample rate 0.342935 per second
> rx frequency 8270.1
> file start time 2017-03-29 15:18:18.290
> polynomial 16K21A
> crc size 21
> number of chars 2
> block size 33
> symbol period 30.000
> number of symbols 848
> list length 2000000
> start offset 9713.674
> freq offset 0.000007
> cores 2
> skipped 9713.210958 seconds to start
> initial reference phase -53.9
> ---------------------------------------------
> ........
> ---------------------------------------------
> found *GM*
> list rank 171375
> reference phase  150  120  150  120
> carrier RMS 5.995e-005 noise RMS 1.831e-005
> carrier S/N 10.30 dB in 39.3 uHz
> carrier Es/N0 -18.98 dB
> carrier Eb/N0 -0.27 dB
> info bit period 2231.58 seconds
> symbol error rate 371/848 = 43.750 %
> Es/N0 from symbol errors -19.0 dB
> Eb/N0 from symbol errors -0.3 dB
> Shannon capacity 2.2 bits/hour
> Shannon efficiency 74.2 %
> symbols file C:\TEMP\ebnaut29_MAR_2156_8270-1pps-symbols.csv
> elapsed 576 seconds
>
> 73 de rn3aus/Alex
>
>
>     Среда, 29 марта 2017, 23:50 +03:00 от DK7FC <73dk7fc@googlemail.com>:
>
>     Hi Domenico, VLF,
>
>     OK, then i will try a new attempt for a first EbNaut message to
>     south Italy. There will be improvements at RC4HAA this weekend, so
>     more carriers will be required then. You can use the chance to
>     receive them as well, in a few days.
>     But for tonite:
>
>     *f = 8270.100000 Hz
>     Start time: Wednesday 029.Mar.2017   18:00:00
>     Symbol period: 30 s
>     Characters: 2
>     CRC bits: 21
>     Coding 16K21A
>     Duration: 7h, 4m
>     Antenna current: 700 mA*
>
>     73, Stefan
>

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Hello Alex, <br>
<br>
Thank you, the message is correct! :-) Very well! And 1990 km during
the relatively high QRN!<br>
But Eb/N0 = -0.3 dB, that's quite close to the limit. On the other side
the transmission just took 7 hours, so we wasted 3...4 hours. But our
recent idea to try 10 characters will be much harder now. <br>
<br>
There will be more signals soon. With some luck, RC4HAA will be ready
for the weekend.<br>
<br>
73, Stefan<br>
<br>
<br>
Am 30.03.2017 18:17, schrieb <a class="moz-txt-link-abbreviated" href="mailto:rn3aus@gmail.com:">rn3aus@gmail.com:</a>
<blockquote cite="mid:1490890636.646895841@f243.i.mail.ru" type="cite">Hello
Stefan, VLF<br>
I have a decode. I hope it is not false ;)<br>
The best result is achieved with the small frequency offset, however
decode is possible also without it.<br>
Some phase variations are noticeable. Perhaps night is too short now
and we need to use day time for transmission?<br>
As usualy files for reprocessing are here: <a moz-do-not-send="true"
 href="http://rn3aus.narod.ru/ebnaut-vlf-29mar2017.zip">http://rn3aus.narod.ru/ebnaut-vlf-29mar2017.zip</a> <br>
  <br>
My grabber is running, next visit on Monday...<br>
  <br>
  <span style="font-size: 10px;">ebnaut-rx V0.5</span><br>
  <span style="font-size: 10px;">input file
C:\TEMP\ebnaut29_MAR_2156_8270-1pps.wav</span><br>
  <span style="font-size: 10px;">sample rate 0.342935 per second</span><br>
  <span style="font-size: 10px;">rx frequency 8270.1</span><br>
  <span style="font-size: 10px;">file start time 2017-03-29 15:18:18.290</span><br>
  <span style="font-size: 10px;">polynomial 16K21A</span><br>
  <span style="font-size: 10px;">crc size 21</span><br>
  <span style="font-size: 10px;">number of chars 2</span><br>
  <span style="font-size: 10px;">block size 33</span><br>
  <span style="font-size: 10px;">symbol period 30.000</span><br>
  <span style="font-size: 10px;">number of symbols 848</span><br>
  <span style="font-size: 10px;">list length 2000000</span><br>
  <span style="font-size: 10px;">start offset 9713.674</span><br>
  <span style="font-size: 10px;">freq offset 0.000007</span><br>
  <span style="font-size: 10px;">cores 2</span><br>
  <span style="font-size: 10px;">skipped 9713.210958 seconds to start</span><br>
  <span style="font-size: 10px;">initial reference phase -53.9</span><br>
  <span style="font-size: 10px;">---------------------------------------------</span><br>
  <span style="font-size: 10px;">........</span><br>
  <span style="font-size: 10px;">---------------------------------------------</span><br>
  <span style="font-size: 10px;">found <strong>GM</strong></span><br>
  <span style="font-size: 10px;">list rank 171375</span><br>
  <span style="font-size: 10px;">reference phase  150  120  150  120</span><br>
  <span style="font-size: 10px;">carrier RMS 5.995e-005 noise RMS
1.831e-005</span><br>
  <span style="font-size: 10px;">carrier S/N 10.30 dB in 39.3 uHz</span><br>
  <span style="font-size: 10px;">carrier Es/N0 -18.98 dB</span><br>
  <span style="font-size: 10px;">carrier Eb/N0 -0.27 dB</span><br>
  <span style="font-size: 10px;">info bit period 2231.58 seconds</span><br>
  <span style="font-size: 10px;">symbol error rate 371/848 = 43.750 %</span><br>
  <span style="font-size: 10px;">Es/N0 from symbol errors -19.0 dB</span><br>
  <span style="font-size: 10px;">Eb/N0 from symbol errors -0.3 dB</span><br>
  <span style="font-size: 10px;">Shannon capacity 2.2 bits/hour</span><br>
  <span style="font-size: 10px;">Shannon efficiency 74.2 %</span><br>
  <span style="font-size: 10px;">symbols file
C:\TEMP\ebnaut29_MAR_2156_8270-1pps-symbols.csv</span><br>
  <span style="font-size: 10px;">elapsed 576 seconds</span><br>
  <br>
73 de rn3aus/Alex<br>
  <br>
  <br>
  <blockquote
 style="border-left: 1px solid rgb(8, 87, 166); margin: 10px; padding: 0pt 0pt 0pt 10px;">
Среда, 29 марта 2017, 23:50 +03:00 от DK7FC
<a class="moz-txt-link-rfc2396E" href="mailto:73dk7fc@googlemail.com">&lt;73dk7fc@googlemail.com&gt;</a>:<br>
    <br>
    <div id="">
    <div class="js-helper js-readmsg-msg">
    <style type="text/css"></style>
    <div> <base target="_self" href="https://e.mail.ru/">
    <div id="style_14908206010000001139_BODY"> Hi Domenico, VLF,<br>
    <br>
OK, then i will try a new attempt for a first EbNaut message to south
Italy. There will be improvements at RC4HAA this weekend, so more
carriers will be required then. You can use the chance to receive them
as well, in a few days.<br>
But for tonite:<br>
    <br>
    <b>f = <span class="js-phone-number">8270.100000</span> Hz<br>
Start time: Wednesday 029.Mar.2017   18:00:00<br>
Symbol period: 30 s<br>
Characters: 2<br>
CRC bits: 21<br>
Coding 16K21A<br>
Duration: 7h, 4m<br>
Antenna current: 700 mA</b><br>
    <br>
73, Stefan<br>
    <br id="style_14908206010000001139_BODY">
    </div>
    </div>
    </div>
    </div>
  </blockquote>
</blockquote>
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