Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by klubnl.pl (8.14.4/8.14.4/Debian-8+deb8u2) with ESMTP id vBALAPG9022636 for ; Sun, 10 Dec 2017 22:10:27 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eO8mT-0005FV-HE for rs_out_1@blacksheep.org; Sun, 10 Dec 2017 21:05:01 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eO8mS-0005FK-Uc for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 21:05:00 +0000 Received: from omr-a001e.mx.aol.com ([204.29.186.53]) by relay1.thorcom.net with esmtps (TLSv1:DHE-RSA-AES256-SHA:256) (Exim 4.89) (envelope-from ) id 1eO8mP-0000nI-7i for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 21:04:59 +0000 Received: from mtaomg-aao01.mx.aol.com (mtaomg-aao01.mx.aol.com [172.27.21.15]) by omr-a001e.mx.aol.com (Outbound Mail Relay) with ESMTP id 2FAAD380009B for ; Sun, 10 Dec 2017 16:04:53 -0500 (EST) Received: from core-acb02f.mail.aol.com (core-acb02.mail.aol.com [172.27.24.2]) by mtaomg-aao01.mx.aol.com (OMAG/Core Interface) with ESMTP id A920938000082 for ; Sun, 10 Dec 2017 16:04:52 -0500 (EST) Received: from 188.194.222.230 by webjas-vaa114.srv.aolmail.net (10.96.33.117) with HTTP (WebMailUI); Sun, 10 Dec 2017 16:04:51 -0500 Date: Sun, 10 Dec 2017 16:04:51 -0500 From: Markus Vester To: rsgb_lf_group@blacksheep.org Message-Id: <160423eabe4-171a-d35c@webjas-vaa114.srv.aolmail.net> In-Reply-To: <2dbcd2a8-0109-41e4-c0ca-aada17f54de8@abelian.org> References: <2dbcd2a8-0109-41e4-c0ca-aada17f54de8@abelian.org> MIME-Version: 1.0 X-MB-Message-Source: WebUI X-MB-Message-Type: User X-Mailer: JAS STD X-Originating-IP: [188.194.222.230] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20150623; t=1512939893; bh=PzlldxFCFV1ge1mimmqk1tlMIlWg7F3x4xV2wSaZ9O4=; h=From:To:Subject:Message-Id:Date:MIME-Version:Content-Type; b=zUVdTPIbnSEktMy13bR52MsZQ+rZwoGqJCtbF7beAyasjz5JprzDyHrnGmxpY1bBI MaEGYeKFwrz2+1YlOPfOxlfcx2jXz7mGu4BEQ73zNQB/p8+FXoRXebWK6iX48W1JSS lmP3OmKRjWls77j5EYdhUYluVW1p0dtN+xkS7oks= x-aol-sid: 3039ac1b150f5a2da1746ce6 X-Spam-Score: 0.0 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has NOT identified this incoming email as spam. The original message has been attached to this so you can view it or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: Congratulations, great work by Mike, Stefan and Paul! I'm glad to see this happen. Best 73, Markus PS: Secretly in my heart I'm hoping that one fine day we might receive a 17 kHz amateur allocation... [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider (markusvester[at]aol.com) -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain 0.0 HTML_MESSAGE BODY: HTML included in message 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: 41a44ec7f64a884bcdc566aa8432178a Subject: Re: VLF: Transatlantic success East to West Content-Type: multipart/alternative; boundary="----=_Part_71367_1581597916.1512939891684" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_20_30,HTML_MESSAGE, MAILTO_TO_SPAM_ADDR autolearn=no version=2.63 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 ------=_Part_71367_1581597916.1512939891684 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Congratulations, great work by Mike, Stefan and Paul! I'm glad to see this = happen. Best 73, Markus PS: Secretly in my heart I'm hoping that one fine day we might receive a 17= kHz amateur allocation... -----Urspr=C3=BCngliche Mitteilung-----=20 Von: Paul Nicholson An: rsgb_lf_group Cc: Michael Smith Verschickt: So, 10. Dez 2017 16:26 Betreff: VLF: Transatlantic success East to West Stefan wrote: > f =3D 17470.1000 Hz > Start time: 07.Dec.2017 21:30:00 UTC > Symbol period: 60 s > Characters: 1 > CRC bits: 10 > Coding 16K21A and > I transmitted the message last night again [9th] A good signal at Forest, VA, from the overnight transmission 9th/10th, via Mike Smith's VLF receiver at 37.35348N,79.19450W, near Lynchburg. Decoded 'T' with Eb/N0 =3D +1.5 dB, BER 42.5%, rank 9; S/N was -36.29 dB in 1Hz; Reference phase 120,135,120,135; Congratulations to Stefan DK7FC and Mike KE4RJQ for the first VLF east-to-west transatlantic message. Distance is 6817.7 km. This is a most significant achievement. East to west is some 20dB harder than the other direction! You can run the decode yourself from the 'vt' file at http://abelian.org/vlf/dk7fc.171209f4.vt The file is 4.2 Mbyte, 2 I/Q sample pairs/second. It was extracted from Mike's raw recording with vtread -T2017-12-09_21:30,+34590 /data/raw-fb | vtfilter -h bp,f=3D17470,w=3D3000 -h bs,f=3D16400,w=3D600 -h bs,f=3D18300,= w=3D800 | vtblank -a13 -d0 -t100 -v | vtmult -f 17470.1 | vtresample -r480 | vtresample -r2 > dk7fc.171209f4.vt Decode with: vtraw -oa dk7fc.171209f4.vt | ebnaut -dp16K21A -r2 -S60 -k10 -N1 -PS15 -L800 -v -c8 -a50 This was a clean decode with no false detects to get in the way. The signal is extremely weak but gives an unambiguous decode. Please CC Mike in any replies, as he is not on the RSGB mailing list. -- Paul Nicholson -- ------=_Part_71367_1581597916.1512939891684 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Congratulations, great work by Mike, Stefan= and Paul! I'm glad to see this happen.

Best 73,
Markus

PS: Secretly in my heart I'm hoping that one fine day we might r= eceive a 17 kHz amateur allocation...


= -----Urspr=C3=BCngliche Mitteilung-----
Von: Paul Nicholso= n <vlf0403@abelian.org>
An: rsgb_lf_group <rsgb_lf= _group@blacksheep.org>
Cc: Michael Smith <mike@unixnu= t.net>
Verschickt: So, 10. Dez 2017 16:26
Betreff: VLF: Transatlantic success East to West


Stefan wrote:

> f =3D 17470.1000 Hz
> Start time: 07.Dec.201= 7 21:30:00 UTC
> Symbol period: 60 s
= > Characters: 1
> CRC bits: 10
>= Coding 16K21A

and

> I transmitted the message last night again [9th]

A good signal at Forest, VA, from the overnight tran= smission
9th/10th, via Mike Smith's VLF receiver at 37.3534= 8N,79.19450W,
near Lynchburg.

Decoded 'T' with Eb/N0 =3D +1.5 dB, BER 42.5%, rank 9;
=
S/N was -36.29 dB in 1Hz;

Reference phase 120,135,120,135;

Congratu= lations to Stefan DK7FC and Mike KE4RJQ for the
first VLF e= ast-to-west transatlantic message. Distance
is 6817.7 km.<= br abp=3D"2750">
This is a most significant achievement. Ea= st to west is some
20dB harder than the other direction!
You can run the decode yourself from the 'vt= ' file at

http://abelian.org/vl= f/dk7fc.171209f4.vt

The file is 4.2 Mb= yte, 2 I/Q sample pairs/second.
It was extracted from Mike'= s raw recording with

vtread -T2017-12-09= _21:30,+34590 /data/raw-fb |
vtfilter -h bp,f=3D17470,= w=3D3000 -h bs,f=3D16400,w=3D600 -h bs,f=3D18300,w=3D800 |
= vtblank -a13 -d0 -t100 -v | vtmult -f 17470.1 |
v= tresample -r480 |
vtresample -r2 > dk7fc.171209f4.v= t

Decode with:

vtraw -oa dk7fc.171209f4.vt |
ebnaut -dp16K21A= -r2 -S60 -k10 -N1 -PS15 -L800 -v -c8 -a50

This was a clean decode with no false detects to get in the
way. The signal is extremely weak but gives an unambiguous
decode.

Please CC Mike in any replies, = as he is not on the RSGB
mailing list.

--
Paul Nicholson
--


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