Return-Path: X-Spam-DCC: paranoid 1181; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO, RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id sBEC5T4d014198 for ; Sun, 14 Dec 2014 13:05:29 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y07pX-000860-Oa for rs_out_1@blacksheep.org; Sun, 14 Dec 2014 11:59:19 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y07pX-00085r-B6 for rsgb_lf_group@blacksheep.org; Sun, 14 Dec 2014 11:59:19 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y07pV-0006QL-Er for rsgb_lf_group@blacksheep.org; Sun, 14 Dec 2014 11:59:18 +0000 Received: from sb.abelian.org (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 485DC3273A3 for ; Sun, 14 Dec 2014 11:58:24 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 817B528A039C for ; Sun, 14 Dec 2014 11:59:16 +0000 (UTC) Message-ID: <548D7B94.70006@abelian.org> Date: Sun, 14 Dec 2014 11:59:16 +0000 From: Paul Nicholson User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130106 Thunderbird/17.0.2 MIME-Version: 1.0 To: "rsgb_lf_group@blacksheep.org" X-Scan-Signature: c9d6a1e47761f7ec7375ac340bef30d0 Subject: VLF: W4DEX reaching Italy and Germany? Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 1488 At Cumiana Italy 44.96N,7.42E run by Renato Romero IK1QFK: Examining 9177Hz S/N and phase in 1 hour steps (278uHz) 20:00 2.9dB 20:30 3.2dB transmission started around 21:20 21:30 6.2dB -102.3 22:00 1.8dB 22:30 6.1dB -159.4 23:00 5.3dB 155.1 23:30 4.1dB 172.9 00:00 6.4dB 151.8 00:30 6.4dB -173.8 01:00 4.4dB -174.5 01:30 6.2dB -174.0 02:00 8.9dB -165.6 02:30 8.1dB -161.3 03:00 6.8dB 151.3 03:30 9.8dB -178.6 transmission ended around 04:30 05:00 -1.2dB 06:00 -2.6dB Undoubtedly a signal there. The steady phase tells us it is a properly disciplined source, a spurious signal from an ordinary xtal source would show lots of drift. A mains harmonic would be invisible at this bandwidth (it would just add to background noise as it drifted by). So, is it W4DEX? A repeat test with a small frequency shift would provide confirmation. S/N is about right given the extra 1Mm beyond Todmorden. Frequency is exact which is improbable otherwise. The signal vanishes after Dex switches off. Signal not present before 21:30, therefore not a harmonic of Renato's GPS timing system. S/N is 13.7dB in this 4 hour spectrum: http://abelian.org/vlf/tmp/141214f.gif It is the strongest signal in 23000 neighbouring bins. With the above, and this one by DL4YHF from the 2nd, http://abelian.org/vlf/tmp/141202j.gif we have two good candidate detections of W4DEX in Europe, awaiting confirmation. See Renato's website http://www.vlf.it/ for lots of articles about VLF/ELF reception techniques. -- Paul Nicholson --