Return-Path: X-Spam-DCC: paranoid 1170; 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=-0.6 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO, NORMAL_HTTP_TO_IP,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 sBIL6XSk029373 for ; Thu, 18 Dec 2014 22:06:33 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Y1iAz-0003UM-1h for rs_out_1@blacksheep.org; Thu, 18 Dec 2014 21:00:01 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Y1iAy-0003U8-8X for rsgb_lf_group@blacksheep.org; Thu, 18 Dec 2014 21:00:00 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1Y1iAw-0006BG-A9 for rsgb_lf_group@blacksheep.org; Thu, 18 Dec 2014 20:59:59 +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 BAEB63273A3 for ; Thu, 18 Dec 2014 20:58:58 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 3979028A12E9 for ; Thu, 18 Dec 2014 20:59:57 +0000 (UTC) Message-ID: <5493404D.2000209@abelian.org> Date: Thu, 18 Dec 2014 20:59:57 +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: <549322C4.8000103@abelian.org> In-Reply-To: <549322C4.8000103@abelian.org> X-Scan-Signature: 896f9ee4f10c5db37812c155e804756d Subject: Re: VLF: W4DEX to IK1QFK at 8822Hz 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: 1516 Last night was the best reception of W4DEX so far in Todmorden. S/N and phase in one hour steps - 19:00 -1.4dB 20:00 7.0dB -143.2 21:00 7.5dB 133.9 22:00 9.6dB 138.6 23:00 10.8dB 116.4 00:00 12.7dB 126.3 01:00 12.7dB 89.4 02:00 13.7dB 110.6 03:00 10.3dB 115.2 04:00 12.8dB 102.8 05:00 13.4dB 120.6 06:00 11.3dB 126.7 07:00 14.1dB 140.4 08:00 15.5dB 137.9 09:00 10.8dB -165.2 10:00 6.1dB -148.0 11:00 -3.4dB 22:00 to 10:00 was 22.4dB S/N in 23.1 uHz and averaged 11.4 dB in 278uHz. It was a strong and steady signal with no serious phase wobbles or drift. A beautiful line in a very narrow bandwidth spectrum, http://abelian.org/vlf/tmp/141218c.gif Here's a spectrogram in a wider bandwidth http://abelian.org/vlf/tmp/141218d.png I could have received a 32 character message from Dex at 17.5 bits per hour using a rate 1/8 convolution code and coherent BPSK modulation. And that's just using the loop receiver. E-field reception was very good too and if that were combined, Dex could have sent 53 characters at 28 bits per hour! Enough to name several cats! Jim wrote: > Does this mean that ERP is now well above 150uW? No I think the ERP is the same or only slightly improved. Signal last night averaged just under 0.12fT and is almost the same every night. Last night the noise was low from 22:00 onwards which gave us a constant high S/N for many hours. I'm very pleased with this reception. Looks like Dex is continuing this long run, live spectrum from Forest VA http://46.4.26.83/sp8822_vlf35.png updating every 10 minutes. -- Paul Nicholson http://abelian.org/ --