Delivered-To: daveyxm@virginmedia.com Received: by 10.50.142.105 with SMTP id rv9csp94169igb; Sun, 8 Jun 2014 14:58:04 -0700 (PDT) X-Received: by 10.194.179.9 with SMTP id dc9mr26307355wjc.74.1402264683738; Sun, 08 Jun 2014 14:58:03 -0700 (PDT) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id hl6si28562656wjb.55.2014.06.08.14.58.03 for ; Sun, 08 Jun 2014 14:58:03 -0700 (PDT) Received-SPF: none (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: owner-rsgb_lf_group@blacksheep.org does not designate permitted sender hosts) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Wtkc4-00007N-Ca for rs_out_1@blacksheep.org; Sun, 08 Jun 2014 22:26:48 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Wtkc4-00007E-4w for rsgb_lf_group@blacksheep.org; Sun, 08 Jun 2014 22:26:48 +0100 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1Wtkc2-0001ty-DT for rsgb_lf_group@blacksheep.org; Sun, 08 Jun 2014 22:26:47 +0100 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 0A2BF327404 for ; Sun, 8 Jun 2014 22:23:15 +0100 (BST) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 5923428A0237 for ; Sun, 8 Jun 2014 21:26:44 +0000 (UTC) Message-ID: <5394D514.3070408@abelian.org> Date: Sun, 08 Jun 2014 21:26:44 +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: <538CD411.9000608@abelian.org> In-Reply-To: X-Spam-Score: 0.7 (/) X-Spam-Report: Spam detection software, running on the system "relay1.thorcom.net", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see the administrator of that system for details. Content preview: I made spectrograms of W4DEX at 8971.1 Hz, Signal/Noise ratio http://abelian.org/vlf/tmp/w4dex_140605a.gif [...] Content analysis details: (0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at http://www.dnswl.org/, no trust [217.72.171.49 listed in list.dnswl.org] 0.7 SPF_NEUTRAL SPF: sender does not match SPF record (neutral) X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: Re: VLF: W4DEX trans-Atlantic at 8971 Hz Content-Type: text/plain; charset=ISO-8859-1; 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 made spectrograms of W4DEX at 8971.1 Hz, Signal/Noise ratio http://abelian.org/vlf/tmp/w4dex_140605a.gif Amplitude http://abelian.org/vlf/tmp/w4dex_140605b.gif The amplitude scale is approximately fT. There's enough signal to send about 12 to 18 bits (2 or 3 characters) during the short night window, and maybe nearly the same again but slower over the weaker daytime path. -- Paul Nicholson --