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 vB7IFPLK002172 for ; Thu, 7 Dec 2017 19:15:28 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1eN0cW-0004NB-NI for rs_out_1@blacksheep.org; Thu, 07 Dec 2017 18:10:04 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1eN0cT-0004Mx-Ca for rsgb_lf_group@blacksheep.org; Thu, 07 Dec 2017 18:10:01 +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 1eN0cQ-0002g3-L4 for rsgb_lf_group@blacksheep.org; Thu, 07 Dec 2017 18:10:00 +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:In-Reply-To: MIME-Version:Date:Message-ID:From:Cc:References:To:Subject:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=9zyzPQsmHBeXlshJCoJ8D0C2Mn7UON3qJ4j8YgvpRIg=; b=lJ2O+12AHVNeUjii2mw7bOuUgm IZKufCACotb4P+hwbdmwqGySKL7vyyrZlUvrF6bgGKColOLmCVFtBBw7cw7L8xr/sDnFWbketkgRm 8ZqFU95f6URmv5RKLIhgMonzP4pnmoBrCoTMzOUyLcqhE62TWUnQvYsCC1rx0G+X/sWc=; Received: from i-194-106-52-83.freedom2surf.net ([194.106.52.83]:43708 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 1eN0cP-0000qn-Fo; Thu, 07 Dec 2017 18:09:57 +0000 Received: from [127.0.0.1] (localhost [127.0.0.1]) by pn.abelian.org (Postfix) with ESMTP id CFF22400254; Thu, 7 Dec 2017 18:09:56 +0000 (UTC) To: rsgb_lf_group@blacksheep.org References: <4d96a9d4-5f22-7650-872b-6344e9aea8e3@abelian.org> <5A19FF75.7080801@posteo.de> <5A1FFE7C.9050703@posteo.de> <5A226B0C.3080701@posteo.de> <579355A36AEE9D4FA555C45D556003AB9AAB0EB9@servigilant.vigilant.local> <5A25C304.3050607@posteo.de> <5A271218.9040803@posteo.de> <5A282BF9.4050409@posteo.de> <5A29193A.2090600@posteo.de> <00f101d36f83$8b02c5d0$a1085170$@comcast.net> Cc: Michael Smith From: Paul Nicholson Message-ID: <39d3d920-05d8-4172-f58a-4914f8f66bc1@abelian.org> Date: Thu, 7 Dec 2017 18:09:56 +0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.3.0 MIME-Version: 1.0 In-Reply-To: <00f101d36f83$8b02c5d0$a1085170$@comcast.net> 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: I'll just summarise to bring Mike Smith at Forest VA into the loop. Stefan DK7FC wrote: > f = 17470.1000 Hz > Start time: 05.Dec.2017 21:40:00 UTC > Symbol period: 30 s > Characters: 4 > CRC bits: 16 > Coding 16K21A [...] 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: 1708620d3ce65bee0beaaede7929769a Subject: Re: VLF: TA 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 I'll just summarise to bring Mike Smith at Forest VA into the loop. Stefan DK7FC wrote: > f = 17470.1000 Hz > Start time: 05.Dec.2017 21:40:00 UTC > Symbol period: 30 s > Characters: 4 > CRC bits: 16 > Coding 16K21A Measures Eb/N0 = -7.5dB with cross-correlation at Forest, that's -38.55 dB in 1Hz. Stefan wrote: > f = 17470.1000 Hz > Start time: 06.Dec.2017 22:00:00 UTC > Symbol period: 40 s > Characters: 3 > CRC bits: 10 > Coding 16K21A Correlates at Eb/N0 = -4.8 dB at Forest, -37.30 dB in 1Hz. It's getting on for 1 in 10,000 chance that these two correlations of the EbNaut messages are from random noise, so this is leading to the first east-to-west amateur VLF detection. This would a remarkable result at 6818 km, the east-to-west path is much harder than west-to-east due to anisotropy of the ionosphere. Hopefully some further transmissions from Stefan will strengthen this result. Ideally a blind decode of a short message. -- Paul Nicholson --