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Date: Mon, 18 Dec 2017 21:03:55 +0100
From: DK7FC <selberdenken@posteo.de>
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In-Reply-To: <79b53aa1-0fa7-d02c-34bf-5b2e3b7bdddb@abelian.org>
Subject: Re: VLF: Transatlantic success East to West
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Thanks Paul for the summary.

Well, 8 days already and it gets worse. I think the phase changes are 
not from my side, so it must be the path.
I think i will give up now with this 3 character message. But even a 
failed attempt gives us a set of data showing the difficulties and phase 
variations.

On the other side, a single character message is to short to let it be 
as it is. So i'm trying a new message with just 2 characters before 
going down to 5170 Hz.
If possible, i daily feedback is apprechated.

*f = 17470.1000 Hz
Start time: 18.Dec.2017  21:30:00 UTC
Symbol period: 45 s
Characters: 2
CRC bits: 14
Coding 16K21A
Duration: 09:12 [hh:mm]
Antenna current: 1.2 A*

73, Stefan


Am 18.12.2017 18:56, schrieb Paul Nicholson:
>
> Results from eight overnight transmissions of the
> 3 character message:
>
>  2017-12-10/11  Eb/N0 = -13.1 dB
>  2017-12-11/12  Eb/N0 =  -6.3 dB, phase 125.3
>  2017-12-12/13  Eb/N0 =  -6.8 dB, phase 143.2
>  2017-12-13/14  Eb/N0 = -19.6 dB (stopped 03:40 by safety limit)
>  2017-12-14/15  Eb/N0 =  -6.0 dB, phase 68.8
>  2017-12-15/16  Eb/N0 = -11.0 dB
>  2017-12-16/17  Eb/N0 = -14.6 dB
>  2017-12-17/18  Eb/N0 =  -9.9 dB, phase 37.0 (stopped 04:19 by snow)
>
> Stacking
>
>  11/12 + 12/13 gives Eb/N0 = -3.6 dB.
>  11/12 + 12/13 + 14/15 gives Eb/N0 = -3.0 dB.
>  11/12 + 12/13 + 14/15 + 15/16 gives Eb/N0 = -2.5 dB.
>  11/12 + 12/13 + 14/15 + 17/18 gives Eb/N0 = -3.4 dB.
>
> There's some phase changing going on here which is making
> stacking not so effective.
>
> -- 
> Paul Nicholson
> -- 
>

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Thanks Paul for the summary. <br>
<br>
Well, 8 days already and it gets worse. I think the phase changes are
not from my side, so it must be the path.<br>
I think i will give up now with this 3 character message. But even a
failed attempt gives us a set of data showing the difficulties and
phase variations. <br>
<br>
On the other side, a single character message is to short to let it be
as it is. So i'm trying a new message with just 2 characters before
going down to 5170 Hz.<br>
If possible, i daily feedback is apprechated.<br>
<br>
<b>f = 17470.1000 Hz<br>
Start time: 18.Dec.2017  21:30:00 UTC<br>
Symbol period: 45 s<br>
Characters: 2<br>
CRC bits: 14<br>
Coding 16K21A<br>
Duration: 09:12 [hh:mm] <br>
Antenna current: 1.2 A</b><br>
<br>
73, Stefan<br>
<br>
<br>
<br>
Am 18.12.2017 18:56, schrieb Paul Nicholson:
<blockquote cite="mid:79b53aa1-0fa7-d02c-34bf-5b2e3b7bdddb@abelian.org"
 type="cite"><br>
Results from eight overnight transmissions of the
  <br>
3 character message:
  <br>
  <br>
 2017-12-10/11  Eb/N0 = -13.1 dB
  <br>
 2017-12-11/12  Eb/N0 =  -6.3 dB, phase 125.3
  <br>
 2017-12-12/13  Eb/N0 =  -6.8 dB, phase 143.2
  <br>
 2017-12-13/14  Eb/N0 = -19.6 dB (stopped 03:40 by safety limit)
  <br>
 2017-12-14/15  Eb/N0 =  -6.0 dB, phase 68.8
  <br>
 2017-12-15/16  Eb/N0 = -11.0 dB
  <br>
 2017-12-16/17  Eb/N0 = -14.6 dB
  <br>
 2017-12-17/18  Eb/N0 =  -9.9 dB, phase 37.0 (stopped 04:19 by snow)
  <br>
  <br>
Stacking
  <br>
  <br>
 11/12 + 12/13 gives Eb/N0 = -3.6 dB.
  <br>
 11/12 + 12/13 + 14/15 gives Eb/N0 = -3.0 dB.
  <br>
 11/12 + 12/13 + 14/15 + 15/16 gives Eb/N0 = -2.5 dB.
  <br>
 11/12 + 12/13 + 14/15 + 17/18 gives Eb/N0 = -3.4 dB.
  <br>
  <br>
There's some phase changing going on here which is making
  <br>
stacking not so effective.
  <br>
  <br>
--
  <br>
Paul Nicholson
  <br>
--
  <br>
  <br>
</blockquote>
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