Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-1.8 required=5.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,HTML_MESSAGE,RCVD_IN_DNSWL_MED, RCVD_IN_SORBS_SPAM,SPF_PASS,T_DKIM_INVALID autolearn=ham autolearn_force=no version=3.4.0 X-Spam-DCC: EATSERVER: mailn 1166; Body=2 Fuz1=2 Fuz2=2 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by lipkowski.org (8.14.4/8.14.4/Debian-8+deb8u1) with ESMTP id v5CCjrQk032688 for ; Mon, 12 Jun 2017 14:45:54 +0200 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1dKOfS-0001y1-KO for rs_out_1@blacksheep.org; Mon, 12 Jun 2017 13:42:02 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1dKOfR-0001xs-VY for rsgb_lf_group@blacksheep.org; Mon, 12 Jun 2017 13:42:01 +0100 Received: from omr-m008e.mx.aol.com ([204.29.186.7]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1dKOfN-0005g7-WC for rsgb_lf_group@blacksheep.org; Mon, 12 Jun 2017 13:42:00 +0100 Received: from mtaomg-mcc02.mx.aol.com (mtaomg-mcc02.mx.aol.com [172.26.253.80]) by omr-m008e.mx.aol.com (Outbound Mail Relay) with ESMTP id 6ECE33800174 for ; Mon, 12 Jun 2017 08:41:55 -0400 (EDT) Received: from core-acb10h.mail.aol.com (core-acb10.mail.aol.com [172.27.24.10]) by mtaomg-mcc02.mx.aol.com (OMAG/Core Interface) with ESMTP id 175E838000082 for ; Mon, 12 Jun 2017 08:41:54 -0400 (EDT) Received: from 188.192.95.60 by webprd-a61.mail.aol.com (10.72.57.72) with HTTP (WebMailUI); Mon, 12 Jun 2017 08:41:53 -0400 Date: Mon, 12 Jun 2017 08:41:53 -0400 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <15c9c532583-6648-76b2@webprd-a61.mail.aol.com> In-Reply-To: <593E8747.6090905@posteo.de> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.192.95.60] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1497271315; bh=vKPS1JOmtV0K9xGk9ngyZ8peOSwlfnw0Hcz3qYYL5l0=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=pX/AIDJDqfv645McKyg8a60dDXLfDD7WxuKJrr/i8r+8JykBN2Rfn3IyTzMbo5Pna l120ynQppD3GyeQig9sUVNF9bUk7Jm29kQgMmsiLGcy1WtHyyKEcrOwLswF4mn3xzV 5C2Ileehn4J26N/RIZl7T02VRGGlyUI/u8cyoMxM= x-aol-sid: 3039ac1afd50593e8c123b77 X-Scan-Signature: e6360f34ef88d0e1db765f70efb2bfe9 Subject: Re: VLF: This weekend... Content-Type: multipart/alternative; boundary="----=_Part_34730_335049818.1497271313793" X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-Scanned-By: MIMEDefang 2.75 Status: RO X-Status: X-Keywords: X-UID: 11956 ------=_Part_34730_335049818.1497271313793 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Well done Stefan and Paul! >> i forgot the message Huh what a pity, so you won't be able to confirm Paul's decode... unless so= meone with a >10 GB machine manages to pull it out from the DL0AO wav ;-) 73, Markus -----Urspr=C3=BCngliche Mitteilung-----=20 Von: DK7FC An: rsgb_lf_group Verschickt: Mo, 12. Jun 2017 14:23 Betreff: Re: VLF: This weekend... Hello Paul, VLF, That's nice, a new record for that week, 100 characters on 6.47 kHz in=20 a single (non-stacked) transmission, even in June!! :-) Many thanks for the decode. It looks like you are further improving your=20 software, so it become a even more powerful tool! I run some very basic=20 exercises in the last days and i can say i'm impressed and i will become=20 a friend of the tool(s). Reporting the decoded message indirectly by using the md5 hash is a=20 cleaver idea, but i find it somehow spoils the fun a bit. In principal=20 the message content is not relevant because it could be any message. But=20 it looks like a bit far from amateur radio when the message is not told=20 directly. Always think about potential newcomers: If someone reads=20 "9f7707ee7424c3c07c3524616fe45b9b" then he could think "What the hell=20 are they doing there??? but if he reads "CQ CQ on the 46 km band de=20 DK7FC in JN49IK, pse KK" then he may rather think "Wow they are really=20 transferring messages on such low frequencies, much longer messages than=20 in JT9, i want to try that too"... Another thing is that i forgot the message, so i'm curious of what you=20 have decoded :-) Can you tell the message please? 94% channel capacity and just 31.1 % bit error rate, how can this be? 73, Stefan Am 12.06.2017 11:25, schrieb Paul Nicholson: > > Stefan schrieb: > > > f =3D 6470.100000 Hz > > Start time: 10.Jun.2017 04:00:00 UTC > > Symbol period: 20 s > > Characters: 100 > > CRC bits: 8 > > Coding 8K21A > > Copied a message with md5 hash (*): 9f7707ee7424c3c07c3524616fe45b9b > Constant reference phase. > > BER 31.1% > > Eb/N0 =3D -1.1 dB, 94% of channel capacity. > > Carrier S/N: 26.42 dB in 10.0 uHz, > -23.60 dB in 1Hz, > -57.58 dB in 2.5kHz > > List rank 1159. > Decoder RAM: 10Gbyte with list length 10k. > > I used ebnaut option -a 100 to normalise the amplitudes in the > decoder. It didn't decode at all without that. I will try that here too, thanks. It didn't see the -a 100 option in the=20 documentation. > > 100 chars is a record message length at 6470 Hz. > > Error map http://abelian.org/vlf/tmp/170612a.png > > I used a night blanker setting -a 12 (in version 8 onwards), > or about -a1.2 before version 8. > > (*) echo -n 'XXX...XXX' | md5sum > > --=20 > Paul Nicholson > --=20 > ------=_Part_34730_335049818.1497271313793 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Well done Stefan and Paul!

>> i forgot= the message

Huh what a pity, so you won't be able to confirm Paul's= decode... unless someone with a >10 GB machine manages to pull it out f= rom the DL0AO wav ;-)

73, Markus


-----Urspr=C3=BCngliche = Mitteilung-----
Von: DK7FC <selberdenken@posteo.de>
An: rsgb_l= f_group <rsgb_lf_group@blacksheep.org>
Verschickt: Mo, 12. Jun 201= 7 14:23
Betreff: Re: VLF: This weekend...

Hello Paul, VLF,<= br>
That's nice, a new record for that week, 100 characters on 6.47 kHz= in
a single (non-stacked) transmission, even in June!! :-)
Many tha= nks for the decode. It looks like you are further improving your
softwa= re, so it become a even more powerful tool! I run some very basic
exerc= ises in the last days and i can say i'm impressed and i will become
a f= riend of the tool(s).

Reporting the decoded message indirectly by us= ing the md5 hash is a
cleaver idea, but i find it somehow spoils the fu= n a bit. In principal
the message content is not relevant because it co= uld be any message. But
it looks like a bit far from amateur radio when= the message is not told
directly.
Always think about potential newc= omers: If someone reads
"9f7707ee7424c3c07c3524616fe45b9b" then he coul= d think "What the hell
are they doing there??? but if he reads "CQ CQ o= n the 46 km band de
DK7FC in JN49IK, pse KK" then he may rather think "= Wow they are really
transferring messages on such low frequencies, much= longer messages than
in JT9, i want to try that too"...

Another= thing is that i forgot the message, so i'm curious of what you
have de= coded :-) Can you tell the message please?

94% channel capacity and = just 31.1 % bit error rate, how can this be?

73, Stefan

Am 12= .06.2017 11:25, schrieb Paul Nicholson:
>
> Stefan schrieb:
= >
> > f =3D 6470.100000 Hz
> > Start time: 10.Jun.2017= 04:00:00 UTC
> > Symbol period: 20 s
> > Characters: 1= 00
> > CRC bits: 8
> > Coding 8K21A
>
> Copie= d a message with md5 hash (*): 9f7707ee7424c3c07c3524616fe45b9b
> Co= nstant reference phase.
>
> BER 31.1%
>
> Eb/N0 =3D= -1.1 dB, 94% of channel capacity.
>
> Carrier S/N: 26.42 dB in= 10.0 uHz,
> -23.60 dB in 1Hz,
> -57.58= dB in 2.5kHz
>
> List rank 1159.
> Decoder RAM: 10Gbyte = with list length 10k.
>
> I used ebnaut option -a 100 to normal= ise the amplitudes in the
> decoder. It didn't decode at all without= that.
I will try that here too, thanks. It didn't see the -a 100 option= in the
documentation.
>
> 100 chars is a record message le= ngth at 6470 Hz.
>
> Error map http://abelian.org/vlf/tmp/170612a.png=
>
> I used a night blanker setting -a 12 (in version 8 onw= ards),
> or about -a1.2 before version 8.
>
> (*) echo -n= 'XXX...XXX' | md5sum
>
> --
> Paul Nicholson
> --=
>

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