Delivered-To: daveyxm@virginmedia.com Received: by 10.50.237.98 with SMTP id vb2csp247905igc; Wed, 5 Mar 2014 15:57:23 -0800 (PST) X-Received: by 10.205.9.67 with SMTP id ov3mr2632469bkb.13.1394063842669; Wed, 05 Mar 2014 15:57:22 -0800 (PST) Return-Path: Received: from post.thorcom.com (post.thorcom.com. [195.171.43.25]) by mx.google.com with ESMTP id pw4si2748175bkb.189.2014.03.05.15.57.22 for ; Wed, 05 Mar 2014 15:57:22 -0800 (PST) Received-SPF: neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) client-ip=195.171.43.25; Authentication-Results: mx.google.com; spf=neutral (google.com: 195.171.43.25 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org) smtp.mail=owner-rsgb_lf_group@blacksheep.org Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1WLLfN-0005oC-EP for rs_out_1@blacksheep.org; Wed, 05 Mar 2014 23:56:01 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1WLLfN-0005o3-1U for rsgb_lf_group@blacksheep.org; Wed, 05 Mar 2014 23:56:01 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.82) (envelope-from ) id 1WLLfL-0000La-Ag for rsgb_lf_group@blacksheep.org; Wed, 05 Mar 2014 23:55:59 +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 D8C083273E0 for ; Wed, 5 Mar 2014 23:54:33 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by sb.abelian.org (Postfix) with ESMTP id 5E55F28A016B for ; Wed, 5 Mar 2014 23:55:58 +0000 (UTC) Message-ID: <5317B98D.3070205@abelian.org> Date: Wed, 05 Mar 2014 23:55:57 +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: <5316EA0B.4020001@abelian.org> <004001cf3870$27cb9620$6401a8c0@JAYDELL> <53173FCD.9010808@abelian.org> <5317A9C5.2050303@tele2.se> 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: Johan wrote: > 24 dB S/N is "armchair copy". Well that 24dB is a 5 hour integration in 55uHz. It makes a big sharp line on the spectrum though. At VLF that counts as 'armchair'. > It would be interesting to actually listen to a > spectrally shifted and time compressed version of > the signal. [...] 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) 0.0 NORMAL_HTTP_TO_IP URI: Uses a dotted-decimal IP address in URL X-Scan-Signature: c1f72e5acb1277e013f90c915ad7ad68 Subject: Re: LF: Re: VLF 29501, signal? 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=1.1 required=5.0 tests=FROM_ENDS_IN_NUMS, NORMAL_HTTP_TO_IP 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 Johan wrote: > 24 dB S/N is "armchair copy". Well that 24dB is a 5 hour integration in 55uHz. It makes a big sharp line on the spectrum though. At VLF that counts as 'armchair'. > It would be interesting to actually listen to a > spectrally shifted and time compressed version of > the signal. > Can you do that on your Linux box Paul? No problem. 5 hours compressed into 22.5 seconds and frequency shifted so that 29499 Hz is moved to 400 Hz. wav format 32k samples/sec mono 1.4 Mbyte http://67.207.143.181/wh2xba1_140303a.wav How good is your 'CW ear' I wonder? Purposely I haven't filtered it too aggressively so you can apply your own filter to suit your ear. -- Paul Nicholson --