Return-Path: X-Spam-DCC: paranoid 1356; 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=-0.5 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, 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 tB8Kr5BP001513 for ; Tue, 8 Dec 2015 21:53:05 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1a6PBg-0007L1-ES for rs_out_1@blacksheep.org; Tue, 08 Dec 2015 20:48:40 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1a6PBf-0007Ks-Rq for rsgb_lf_group@blacksheep.org; Tue, 08 Dec 2015 20:48:39 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1a6PAW-0002fa-2u for rsgb_lf_group@blacksheep.org; Tue, 08 Dec 2015 20:48:38 +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 50F513273EB for ; Tue, 8 Dec 2015 20:38:09 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id D8CE028A0587 for ; Tue, 8 Dec 2015 20:47:15 +0000 (UTC) Message-ID: <566741D3.1040906@abelian.org> Date: Tue, 08 Dec 2015 20:47:15 +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 References: <5666FA16.5030401@posteo.de> In-Reply-To: <5666FA16.5030401@posteo.de> X-Scan-Signature: e6de17d69e46ff4ea8db042ef2cd7e46 Subject: Re: LF: 8270 Hz traces again! AK 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: 5667 Carrier of DJ8WX measured in about 80uHz bandwidth. S/N is 18.4dB in this bandwidth. http://abelian.org/vlf/tmp/151208a.gif The magnetic flux density of 0.1fT corresponds to around 30nV/m electric field strength. Uwe wrote (28th Nov) > Coding 8k19a > Characters 2 > Bits 368 > Duration 01:01:20.00 > Start 2015-11-28 17:00:00 > Rpt on hour > (in between carrier only) With the above S/N, this should decode at about Eb/N0 = +2.5dB Uwe wrote (today) > carrier on the air. > the message starts at 18:00:00 At 18:00 I am still getting carrier. When I run this into the decoder it struggles to decode, the noise has come up since the S/N measurement. I add in the E-field to gain a couple of dB and then the carrier decodes: 18:00:00 to 19:01:20 found rank 0: ** ps [ 2 30 30 30 30] re-encode 131/368 ber 3.56e-01 Es/N0=-11.6 Eb/N0=3.3 (Carrier decodes to a string of * characters). -- Paul Nicholson --