Return-Path: Received: from mtain-dc04.r1000.mx.aol.com (mtain-dc04.r1000.mx.aol.com [172.29.64.132]) by air-me04.mail.aol.com (v129.4) with ESMTP id MAILINME044-8baf4d549e19344; Thu, 10 Feb 2011 21:25:29 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc04.r1000.mx.aol.com (Internet Inbound) with ESMTP id 0C6A63800008B; Thu, 10 Feb 2011 21:25:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pnig1-0004Jo-Jl for rs_out_1@blacksheep.org; Fri, 11 Feb 2011 02:24:05 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pnig1-0004Jf-7O for rsgb_lf_group@blacksheep.org; Fri, 11 Feb 2011 02:24:05 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pnig0-0005Aw-44 for rsgb_lf_group@blacksheep.org; Fri, 11 Feb 2011 02:24:05 +0000 Received: from ix.urz.uni-heidelberg.de (cyrus-portal.urz.uni-heidelberg.de [129.206.100.176]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p1B2O1be001038 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 11 Feb 2011 03:24:02 +0100 Received: from extmail.urz.uni-heidelberg.de (extmail.urz.uni-heidelberg.de [129.206.100.140]) by ix.urz.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id p1B2O1Mp020209 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 11 Feb 2011 03:24:01 +0100 Received: from [147.142.13.130] (vpn513-130.rzuser.uni-heidelberg.de [147.142.13.130]) by extmail.urz.uni-heidelberg.de (8.13.4/8.13.1) with ESMTP id p1B2O0fM030079 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 11 Feb 2011 03:24:01 +0100 Message-ID: <4D549DCF.3000401@iup.uni-heidelberg.de> Date: Fri, 11 Feb 2011 03:24:15 +0100 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.11) Gecko/20100711 Thunderbird/3.0.6 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org CC: Bernd Grupe , Renato Romero X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: VLF: First CW detection on VLF on the Dreamers Band in the far field Content-Type: text/plain; charset=ISO-8859-15; 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=0.0 required=5.0 tests=none 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 x-aol-global-disposition: G x-aol-sid: 3039ac1d40844d549e170821 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) Dear LF/VLF group, In my 10th experiment i did a CW transmission test on 8970 Hz / 33km, arround 11 UTC. No one in some 10 km radius received the signal but my grabber PC was recording the whole day. Now i successfully extracted the part of the CW transmission which is just some minutes. The CW (somewhat arround 100 bpm) signal was converted to 700 Hz using SpecLab: A 10th order butterworth filter (BW= 3 kHz, f center = 8970 Hz) was applied. After that the clipper and noise blanker was applied. Then, frequency conversion by 8270 Hz (USB downconverter). After that a very narrow CW filter (all within SpecLab), centered at 680 Hz, 100 Hz BW and 50 Hz slope was applied. This strongly improved the audibility and removed unwanted tones. It is the first detection of a real CW transmission on the Dreamers Band / 8970 Hz in the far field and even above 1 Lambda. The distance is 40.0 km An audio file is available at http://dl.dropbox.com/u/19882028/DK7FCinCWon8970Hzthe33kmband.WAV (about 40 MB) The message was invented spontaneously. If i would have known that it so well audible, i would have been better prepared, HI. Vy 73, Stefan/DK7FC