Message-ID: <5A0AE5A4.7080303@posteo.de>
Date: Tue, 14 Nov 2017 13:46:28 +0100
From: DK7FC <selberdenken@posteo.de>
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3
MIME-Version: 1.0
To: rsgb_lf_group@blacksheep.org
References: <15f68ccfd03-c09-1dcf0@webjas-vaa134.srv.aolmail.net> <Pine.LNX.4.64.1710291833570.23786@plato.ucs.mun.ca> <40168a26-8991-6998-e541-585a8575ad32@abelian.org> <59FCF49B.9050703@posteo.de> <5A06DAE4.9030301@posteo.de> <5A072F91.1050406@posteo.de> <5A083D50.2080105@posteo.de> <34e5e647-caf1-6184-9ab5-9d293486994f@abelian.org> <5A085F65.3060409@posteo.de> <b81c78a3-c6fa-b07c-b14b-ca0a983bcd68@abelian.org> <5A0889B1.3020701@posteo.de> <95ad37be-4272-7e3c-180c-8200cac238ad@abelian.org>
In-Reply-To: <95ad37be-4272-7e3c-180c-8200cac238ad@abelian.org>
Subject: Re: VLF: A 300 char message?
Content-Type: multipart/mixed;
 boundary="------------030502010307090802080506"
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

This is a multi-part message in MIME format.
--------------030502010307090802080506
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit

Hi Paul, VLF,

Great! I think this is the longest EbNaut message ever, so far ;-) 
Thanks for the decode.
We needed 3 days but the right 2 days would have been fine as well. Did 
you try to decode the 3rd on its own?
With just a few 1/10 dB less noise we could manage a decode in one 
night, that's impressive.
I could now try to pass you a 1000 character message using ebkey and a 
relay steered by the Raspi. But i would tend to focus on other goals in 
the next days, i.e. further attempts with RC4HAA.

Markus, the message is in attachment.

73, Stefan

Am 14.11.2017 12:03, schrieb Paul Nicholson:
>
> Stefan wrote:
>
> > f = 8270.1000 Hz
> > Start time: 11.November.2017  17:00:00 UTC
> > Symbol period: 6 s
> > Characters: 300
> > CRC bits: 16
> > Coding 4K19A
> > Duration: 12:13:36h
>
> > message start delayed by 15 minutes...
>
> Copied
>
>  "HELLO PAUL AND THE REST OF THE LF GROUP! WELL, THIS IS THE NEW
>   LONGEST MESSAGE TRANSMITTED ON VLF. THANKS TO ALL  STATIONS WHO
>   PARTICIPATE IN THE EXPERIMENTS SINCE 2010! VLF IS A GREAT REAGION
>   IN THE RF SPECTRUM. WHO KNOWS WHAT WE WILL DEVELOP AND DISCOVER
>   IN THE NEXT TIME :-D  73 DE DK7FC IN JN49IK"
>
> using combined 12th/13th and 13th/14th.
>
> Constant reference phase, Eb/N0 = +1.7 dB, BER 21.4%, list rank 0
> S/N -12.40 dB in 1Hz, -46.38 dB in 2.5kHz.
>
> Each night:
>
>  11th/12th  Eb/N0 = -4.4 dB, phase 101.5 deg, -18.50 dB in 1Hz;
>  12th/13th  Eb/N0 = -2.0 dB, phase  92.5 deg, -16.07 dB in 1Hz;
>  13th/14th  Eb/N0 = -0.6 dB, phase 100.6 deg, -14.73 dB in 1Hz;
>
> Combinations
>  11/12 + 12/13: -0.1 dB (no decode up to 6E6 list);
>  12/13 + 13/14: +1.7 dB (decodes BER 21.4% rank 0);
>  11/12 + 13/14: +0.7 dB (decodes BER 22.6% rank 82);
>
> All three: +2.6 dB;
>
> -- 
> Paul Nicholson
> -- 
>

--------------030502010307090802080506
Content-Type: application/x-compressed;
 name="300 char 8270.zip"
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
 filename="300 char 8270.zip"

UEsDBBQAAAAIAPi1Y0tOiLW70QAAACwBAAARAAAAMzAwIGNoYXIgODI3MC50eHQ1j81qw0AM
hF9lcm9D+gOhPRfTQw6llOYsbMXeeq1dVnI2j1+tIaCDkL6ZkT45xoQvWiNIBtjEKKyGdNn6
U4expDXvcHbwwWdB4dV2whUxydjwhVVpZFgh0SWY8YAk+D11e/xMJLNLEihGQI0sJFHUKSFT
sdCHTMYIstnyLXMJC4spNEjPeD48HXbNqyWTH8RkfiWNbnNXfXfQzL2Vddnj7M6zpNoyHK2M
Gjx64CvHlLdHh6B9unK564VvBvNYvD9+AMcXpzHMx0vfiD95fQvzP1BLAQIUABQAAAAIAPi1
Y0tOiLW70QAAACwBAAARAAAAAAAAAAEAIAAAAAAAAAAzMDAgY2hhciA4MjcwLnR4dFBLBQYA
AAAAAQABAD8AAAAAAQAAAAA=
--------------030502010307090802080506--