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=-0.8 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 sBC8VEjY009038 for ; Fri, 12 Dec 2014 09:31:16 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1XzLWi-0000nA-Cj for rs_out_1@blacksheep.org; Fri, 12 Dec 2014 08:24:40 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1XzLWh-0000n1-MV for rsgb_lf_group@blacksheep.org; Fri, 12 Dec 2014 08:24:39 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.84) (envelope-from ) id 1XzLWf-0007Ik-Tr for rsgb_lf_group@blacksheep.org; Fri, 12 Dec 2014 08:24:38 +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 8F7853273A5 for ; Fri, 12 Dec 2014 08:23:47 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id B047C28A12BD for ; Fri, 12 Dec 2014 08:24:36 +0000 (UTC) Message-ID: <548AA644.4030707@abelian.org> Date: Fri, 12 Dec 2014 08:24:36 +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: <5489EFBC.3050401@abelian.org> <5489F474.4030904@abelian.org> <5489FA44.3010709@abelian.org> In-Reply-To: <5489FA44.3010709@abelian.org> X-Scan-Signature: 4d4a9e8f68fb15c54898568240f542c5 Subject: Re: VLF: 8819.9 Hz in Virginia? 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: 1463 Spectrogram covering 24 hours yesterday http://abelian.org/vlf/tmp/141211c.gif A wandering signal from a crystal source of average stability. These are fairly common when you dig deep enough into the noise. Fortunately easy to distinguish from a GPS locked amateur signal. Demonstrates how useless an undisciplined xtal osc is for VLF (tx and rx). -- Paul Nicholson --