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 vBAFVjap021511 for ; Sun, 10 Dec 2017 16:31:48 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eO3Rr-0004CM-6C for rs_out_1@blacksheep.org; Sun, 10 Dec 2017 15:23:23 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eO3RY-0004CD-El for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 15:23:04 +0000 Received: from porthos.netcom.co.uk ([217.72.171.73]) by relay1.thorcom.net with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eO3RU-0007yz-Sp for rsgb_lf_group@blacksheep.org; Sun, 10 Dec 2017 15:23:03 +0000 X-DKIM-Result: Domain=abelian.org Result=Signature OK DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=abelian.org ; s=default; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Date: Message-ID:Subject:From:Cc:To:Sender:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=9vzWqQA9P2T+37pCg6YfhhjBLT+cVn+8IP9zbnYjtBk=; b=vAlz/Un+A7MZfbX0WSt7HEYsA0 p71sv/0xNO/qG4JPdi74ETkjP9d3O/jKkN4pcdDbSdjXvaUuiLM5KVJEvlj/jqGCzYMvewluhQn/Y 896mMAlTToekAIKd8OOJMN9nSkAZu7SVwlGKuQxnXJQmTyaqQ3VWuMenyHtBq9fYnQPQ=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:59511 helo=pn.abelian.org) by porthos.netcom.co.uk with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eO3RS-0006ol-8I; Sun, 10 Dec 2017 15:22:58 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id 8AE5B400068; Sun, 10 Dec 2017 15:22:57 +0000 (UTC) To: rsgb_lf_group@blacksheep.org Cc: Michael Smith From: Paul Nicholson Message-ID: <2dbcd2a8-0109-41e4-c0ca-aada17f54de8@abelian.org> Date: Sun, 10 Dec 2017 15:22:57 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 Content-Language: en-US X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - porthos.netcom.co.uk X-AntiAbuse: Original Domain - blacksheep.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - abelian.org X-Get-Message-Sender-Via: porthos.netcom.co.uk: authenticated_id: catchall@abelian.org X-Authenticated-Sender: porthos.netcom.co.uk: catchall@abelian.org 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: Stefan wrote: > f = 17470.1000 Hz > Start time: 07.Dec.2017 21:30:00 UTC > Symbol period: 60 s > Characters: 1 > CRC bits: 10 > Coding 16K21A and [...] Content analysis details: (0.0 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 T_DKIM_INVALID DKIM-Signature header exists but is not valid X-Scan-Signature: d7fcd9b75df8d1b09ddef9df028bd9ae Subject: VLF: Transatlantic success East to West Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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 Stefan wrote: > f = 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 = +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=17470,w=3000 -h bs,f=16400,w=600 -h bs,f=18300,w=800 | 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 --