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Date: Fri, 13 Jan 2017 00:50:58 +0100
From: DK7FC <selberdenken@posteo.de>
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In-Reply-To: <5877CF56.5040802@abelian.org>
Subject: Re: VLF: Back on 5.17 kHz / 58 km...
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Hello Paul,

Thanks, that's great, just 3 days of about 8 hours each, for a 20 
character message. But what was the message? I need to know it so i can 
see it as a valid detection.
The daily transmissions are a good choice and i have my LF and MF 
receivers available for receptions in the evening and night and early 
morning.

Tomorrow and during the weekend i have no time to play on the roof so 
let's use these days for a longer transmission.
Since we are already doing crazy things which are not possible (most HF 
or even GHz guys would think like that), let's keep it that way and try 
the following:

*f = 5170.000000 Hz
Start time: 13.Jan.2017   08:00:00 UTC  (daily repetition)
Symbol period: 6 s
Characters: 100 (!)
CRC bits: 8
Coding 8K19A
Duration: 8h, 20m, 48s
Antenna current: ~ 225 mA*

After the 75 character message you said that 0 CRC bits would have been 
a better choice. So i'm reducing the CRC bits here to 8, i can't go 
lower with the current EbNaut-tx version.


73, Stefan


Am 12.01.2017 19:47, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > f = 5170.000000 Hz
> > Start time: 10.Jan.2017   08:00:00 UTC
> > Symbol period: 24 s
> > Characters: 20
> > CRC bits: 16
> > Coding 8K19A
>
> Decoded after stacking three of the daily transmissions.
>
> Eb/N0 = -0.7dB BER 34.7% at rank 71540 with constant
> reference phase.
>
> S/N (three days combined) 20.00 dB in 33.8 uHz.
>
> Each day:
>
>  10th -5.8 dB  phase 24.5   -63.9dB in 2500Hz
>  11th -5.3 dB  phase 22.8   -63.5dB in 2500Hz
>  12th -4.9 dB  phase 16.8   -63.0dB in 2500Hz
>
> -- 
> Paul Nicholson
> -- 
>

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Hello Paul, <br>
<br>
Thanks, that's great, just 3 days of about 8 hours each, for a 20
character message. But what was the message? I need to know it so i can
see it as a valid detection.<br>
The daily transmissions are a good choice and i have my LF and MF
receivers available for receptions in the evening and night and early
morning.<br>
<br>
Tomorrow and during the weekend i have no time to play on the roof so
let's use these days for a longer transmission.<br>
Since we are already doing crazy things which are not possible (most HF
or even GHz guys would think like that), let's keep it that way and try
the following:<br>
<br>
<big><b>f = 5170.000000 Hz<br>
Start time: 13.Jan.2017   08:00:00 UTC  (daily repetition)<br>
Symbol period: 6 s<br>
Characters: 100 (!)<br>
CRC bits: 8 <br>
Coding 8K19A<br>
Duration: 8h, 20m, 48s<br>
Antenna current: ~ 225 mA</b></big><br>
<br>
After the 75 character message you said that 0 CRC bits would have been
a better choice. So i'm reducing the CRC bits here to 8, i can't go
lower with the current EbNaut-tx version.<br>
<br>
<br>
73, Stefan<br>
<br>
<br>
Am 12.01.2017 19:47, schrieb Paul Nicholson:
<blockquote cite="mid:5877CF56.5040802@abelian.org" type="cite"><br>
Stefan wrote:
  <br>
  <br>
&gt; f = 5170.000000 Hz
  <br>
&gt; Start time: 10.Jan.2017   08:00:00 UTC
  <br>
&gt; Symbol period: 24 s
  <br>
&gt; Characters: 20
  <br>
&gt; CRC bits: 16
  <br>
&gt; Coding 8K19A
  <br>
  <br>
Decoded after stacking three of the daily transmissions.
  <br>
  <br>
Eb/N0 = -0.7dB BER 34.7% at rank 71540 with constant
  <br>
reference phase.
  <br>
  <br>
S/N (three days combined) 20.00 dB in 33.8 uHz.
  <br>
  <br>
Each day:
  <br>
  <br>
 10th -5.8 dB  phase 24.5   -63.9dB in 2500Hz
  <br>
 11th -5.3 dB  phase 22.8   -63.5dB in 2500Hz
  <br>
 12th -4.9 dB  phase 16.8   -63.0dB in 2500Hz
  <br>
  <br>
--
  <br>
Paul Nicholson
  <br>
--
  <br>
  <br>
</blockquote>
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