Message-ID: <59D5F2FF.4070905@posteo.de>
Date: Thu, 05 Oct 2017 10:53:19 +0200
From: DK7FC <selberdenken@posteo.de>
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To: rsgb_lf_group@blacksheep.org
CC: Alex K <rn3aus@mail.ru>
References: <15ee3ca0461-c0d-38c1@webjas-vae239.srv.aolmail.net> <0e8c591a-d943-5c50-935f-7cf5b87ad2d5@abelian.org> <59D4AEF0.8070001@posteo.de> <1507190858.726540020@f403.i.mail.ru>
In-Reply-To: <1507190858.726540020@f403.i.mail.ru>
Subject: Re: VLF: 300 mA on 6470 Hz
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Hello Alex,

What a surprise! This is most amazing. You got the message correctly 
over a 1985 km distant land path and even with Eb/N0 = 6.1 dB :-) 4 
characters would have been possible as well :-) I'm very happy with that 
result. And i bet, we will make it on 5170 Hz too!!
My congrats to your excellent RX setup!

Also thanks Jacek and Paul for the decode and permanent monitoring. It 
will stay exciting here and when we go lower in frequency.

Well it looks like we can learn more about the behavior of the 46 km 
wave, daily phase and amplitude variations. I'd like to focus on night 
transmissions since this less critical here.
Markus has built a tool for stacking the txt files generated by 
SpecLab:  http://df6nm.bplaced.net/VLF/fec_tests/add.zip I tried it 
yesterday and it works easy, even easier than expected. So there is a 
way for Windows users to stack daily receptions.
So let's try a longer message. I hope that Alex will get it too, by 
stacking a few daily receptions:

*f = 6470.100000 Hz
Start time: 05.October.2017  17:00:00 UTC (daily)
Symbol period: 40 s
Characters: 16
CRC bits: 21
Coding 8K19
Duration: 12h
Antenna current: 300 mA*

I'm transmitting as long as Alex and Jecek will get the message. Paul 
will get a daily decode i think, and daily SNR and phase informations.

73, Stefan


Am 05.10.2017 10:07, schrieb Alex K:
> Hello Stefan,
> I have two free days and my old VLF grabber in ko85ha is now running 
> for 2-3 weeks! 6470 and 5170 Speclab-ebnaut instances are active. I 
> will periodically visit my grabber (as in February 2017).
>
> And I have first result (see attachment for confirmation).
> 73 de Rn3aus
>
>     OK, so i'm changing to:
>
>     *f = 6470.005000 Hz
>     Start time: 04.October.2017  17:00:00 UTC
>     Symbol period: 240 s
>     Characters: 1
>     CRC bits: 0
>     Coding 8K19A
>     Duration: 12h48min
>     Antenna current: 300 mA*
>
>
>
>
>
>

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Hello Alex, <br>
<br>
What a surprise! This is most amazing. You got the message correctly
over a 1985 km distant land path and even with Eb/N0 = 6.1 dB :-) 4
characters would have been possible as well :-) I'm very happy with
that result. And i bet, we will make it on 5170 Hz too!!<br>
My congrats to your excellent RX setup!<br>
<br>
Also thanks Jacek and Paul for the decode and permanent monitoring. It
will stay exciting here and when we go lower in frequency.<br>
<br>
Well it looks like we can learn more about the behavior of the 46 km
wave, daily phase and amplitude variations. I'd like to focus on night
transmissions since this less critical here.<br>
Markus has built a tool for stacking the txt files generated by
SpecLab:  <a class="moz-txt-link-freetext" href="http://df6nm.bplaced.net/VLF/fec_tests/add.zip">http://df6nm.bplaced.net/VLF/fec_tests/add.zip</a> I tried it
yesterday and it works easy, even easier than expected. So there is a
way for Windows users to stack daily receptions.<br>
So let's try a longer message. I hope that Alex will get it too, by
stacking a few daily receptions:<br>
<br>
<b>f = 6470.100000 Hz<br>
Start time: 05.October.2017  17:00:00 UTC (daily)<br>
Symbol period: 40 s<br>
Characters: 16<br>
CRC bits: 21<br>
Coding 8K19<br>
Duration: 12h<br>
Antenna current: 300 mA</b><br>
<br>
I'm transmitting as long as Alex and Jecek will get the message. Paul
will get a daily decode i think, and daily SNR and phase informations.<br>
<br>
73, Stefan<br>
<br>
<br>
<br>
<br>
Am 05.10.2017 10:07, schrieb Alex K:
<blockquote cite="mid:1507190858.726540020@f403.i.mail.ru" type="cite">Hello
Stefan,
  <div>I have two free days and my old VLF grabber in ko85ha is now
running for 2-3 weeks! 6470 and 5170 Speclab-ebnaut instances are
active. I will periodically visit my grabber (as in February 2017).</div>
  <div><br>
  </div>
  <div>And I have first result (see attachment for confirmation).<br>
73 de Rn3aus <br>
  <br>
  <blockquote
 style="border-left: 1px solid rgb(8, 87, 166); margin: 10px; padding: 0pt 0pt 0pt 10px;">
    <div id="">
    <div class="js-helper js-readmsg-msg">
    <div id="viewmessagebody" class="mr_read__body">
    <div id="style_15071108270000002733_BODY">OK, so i'm changing to:<br>
    <br>
    <b>f = 6470.005000 Hz<br>
Start time: 04.October.2017  17:00:00 UTC<br>
Symbol period: 240 s<br>
Characters: 1<br>
CRC bits: 0<br>
Coding 8K19A<br>
Duration: 12h48min<br>
Antenna current: 300 mA</b><br>
    <br>
    <br>
    <br>
    </div>
    <base target="_self" href="https://touch.mail.ru/cgi-bin/"> </div>
    </div>
    </div>
  </blockquote>
  <br>
  <br>
  <br>
  </div>
  <style type="text/css"></style></blockquote>
</body>
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