Return-Path: Received: from mtain-dc11.r1000.mx.aol.com (mtain-dc11.r1000.mx.aol.com [172.29.64.139]) by air-da09.mail.aol.com (v129.4) with ESMTP id MAILINDA092-86194bec49b325f; Thu, 13 May 2010 14:49:23 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dc11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8B36C380000F0; Thu, 13 May 2010 14:49:21 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OCdSQ-0007pQ-KR for rs_out_1@blacksheep.org; Thu, 13 May 2010 19:48:30 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OCdSQ-0007pH-8N for rsgb_lf_group@blacksheep.org; Thu, 13 May 2010 19:48:30 +0100 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OCdSK-00038I-OU for rsgb_lf_group@blacksheep.org; Thu, 13 May 2010 19:48:30 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id o4DImB1q016615 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 13 May 2010 20:48:12 +0200 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o4DImNpp020755 for ; Thu, 13 May 2010 20:48:23 +0200 Message-ID: <4BEC496D.3000300@iup.uni-heidelberg.de> Date: Thu, 13 May 2010 20:48:13 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <003501caf1fd$9d39a0e0$0401a8c0@xphd97xgq27nyf> <4BEBEE46.9040702@iup.uni-heidelberg.de> In-Reply-To: <4BEBEE46.9040702@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: VLF: Outdoor test for different places for active E-field antennas for VLF 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=0.0 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: 3039ac1d408b4bec49b156e9 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Dear group, Today i checked 3 different places for my VLF grabber antenna. The currently used antenna was not touched. I used a second antenna that uses a fiber optic cable + battery that totally decouples the antenna from the PC (noise!). The first time i cheked the QTH in the 7th floor of the institute. The signal was 20 dB stronger and all local QRM lines are gone! I created a report with many photos and spectrograms to see the difference. First it was thought to be just a notice for me but due to the impressing difference of the received signals i want to share it to other OMs who are working with active E field antennas. Sorry, it is in german language but perhaps you can use a online translator, if you are not german and interested ;-) There are some OMs planning to built an active antenna for VLF and some who have problems or are sceptic about these fiber optic cables. Also some are afraid with antennas connected to the PC, when thunder storms occurr. There, the fiber optic cable is surely a good way to do it, we know. So if you want to take a look, look here: http://www.iup.uni-heidelberg.de/schaefer_vlf/Vergleichstest_Antennenstandorte_UNI_HD.pdf Wish you a nice weekend and better WX than here ;-) Stefan/DK7FC