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Date: Wed, 02 Nov 2016 21:37:37 +0100
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Subject: Re: VLF: EbNaut transmissions on lower frequencies?, pre-tests: 6.47kHz
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Hi Paul,

OK, very well!
Now, let's try:

*f = 6470.00000 Hz
Start time: 03.11.2016   06:00:00 UTC
Symbol length: 30 s
Characters: 11
CRC 16
Coding 16K25A
Duration: 14h, 08m, 0s*
*Antenna current: ~ 280 mA *

73, Stefan


Am 02.11.2016 21:25, schrieb Paul Nicholson:
>
> Even more aggressive sferic blanking raises
> the decode to Eb/N0 +1.7 dB BER 38.2%
> S/N 16.10 dB in 25.4 uHz.
>
> Using around 50% of the channel capacity.
>
> The carrier S/N is about 1.6 dB weaker than
> expected for that Eb/N0.
>
> > Would you think a 11 character message will decode?
>
> Yes, with the same signal and noise, it would decode
> at about +0.8 dB... if the terminator doesn't mess
> things up.
>
> > Can you provide a bit error image (you know what i mean)
>
>  http://abelian.org/vlf/tmp/161102a.gif
>
> There are 1312 transmitted symbols, 30 seconds each.
> Each red line indicates a symbol received in error, there
> are 502 of these.
>
> -- 
> Paul Nicholson
> -- 
>

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Hi Paul, <br>
<br>
OK, very well!<br>
Now, let's try:<br>
<br>
<big><b>f = 6470.00000 Hz<br>
Start time: 03.11.2016   06:00:00 UTC<br>
Symbol length: 30 s<br>
Characters: 11<br>
CRC 16<br>
Coding 16K25A<br>
Duration: 14h, 08m, 0s</b></big><br>
<big><b>Antenna current: ~ 280 mA </b></big><br>
<br>
73, Stefan<br>
<br>
<br>
<br>
<br>
Am 02.11.2016 21:25, schrieb Paul Nicholson:
<blockquote cite="mid:581A4BC6.9030106@abelian.org" type="cite"><br>
Even more aggressive sferic blanking raises
  <br>
the decode to Eb/N0 +1.7 dB BER 38.2%
  <br>
S/N 16.10 dB in 25.4 uHz.
  <br>
  <br>
Using around 50% of the channel capacity.
  <br>
  <br>
The carrier S/N is about 1.6 dB weaker than
  <br>
expected for that Eb/N0.
  <br>
  <br>
&gt; Would you think a 11 character message will decode?
  <br>
  <br>
Yes, with the same signal and noise, it would decode
  <br>
at about +0.8 dB... if the terminator doesn't mess
  <br>
things up.
  <br>
  <br>
&gt; Can you provide a bit error image (you know what i mean)
  <br>
  <br>
 <a class="moz-txt-link-freetext" href="http://abelian.org/vlf/tmp/161102a.gif">http://abelian.org/vlf/tmp/161102a.gif</a>
  <br>
  <br>
There are 1312 transmitted symbols, 30 seconds each.
  <br>
Each red line indicates a symbol received in error, there
  <br>
are 502 of these.
  <br>
  <br>
--
  <br>
Paul Nicholson
  <br>
--
  <br>
  <br>
</blockquote>
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