Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-ma05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 729D8380000A3; Thu, 24 Jan 2013 15:25:00 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TyTLG-0003wq-3T for rs_out_1@blacksheep.org; Thu, 24 Jan 2013 20:24:10 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TyTLF-0003wf-Me for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2013 20:24:09 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TyTLD-0007KZ-6M for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2013 20:24:08 +0000 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 r0OKNk6E022806 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 24 Jan 2013 21:23:46 +0100 Received: from [129.206.22.206] (pc206.iup.uni-heidelberg.de [129.206.22.206]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id r0OKNjxS024828 for ; Thu, 24 Jan 2013 21:23:45 +0100 Message-ID: <5101984D.4020704@iup.uni-heidelberg.de> Date: Thu, 24 Jan 2013 21:23:41 +0100 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: <7E7DFBB4D102A04DB5ADC88D66628A4A0FB6B9CC@ICTS-S-MBX5.luna.kuleuven.be> In-Reply-To: <7E7DFBB4D102A04DB5ADC88D66628A4A0FB6B9CC@ICTS-S-MBX5.luna.kuleuven.be> 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: In my experiment of last July i found that 2x 140m worked best. Of course this depends on the height above ground and the ground conductivity and further parameters. https://dl.dropbox.com/u/19882028/MF/A%20full%20size%20dipole%20for%20the%20630%20m%20band.pdf [...] Content analysis details: (-0.7 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [129.206.100.212 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: f38d515a9cad1e977fcfe251941a8120 Subject: Re: LF: RE: earth antenna test 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: 3039ac1d600d5101989b2efd X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none In my experiment of last July i found that 2x 140m worked best. Of course this depends on the height above ground and the ground conductivity and further parameters. https://dl.dropbox.com/u/19882028/MF/A%20full%20size%20dipole%20for%20the%20630%20m%20band.pdf 73, Stefan/DK7FC Am 23.01.2013 08:48, schrieb Rik Strobbe: > Hello Dimitris, > > very interesting, in particular the comparison between the terminated and unterminated wires. > The fact that an unterminated wire works brings up another experiment: how would a dipole placed on the ground perform? > On 475kHz a half wave length would be 316m (2x158m), the physical length probably 300m or less. > > 73, Rik ON7YD - OR7T > > ________________________________________ > Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Dimitrios Tsifakis [dtsifakis@gmail.com] > Verzonden: woensdag 23 januari 2013 5:42 > To: rsgb_lf_group@blacksheep.org > Onderwerp: LF: earth antenna test > > Hello group, > > here is a quick test I did on 475 kHz, using some wires laying on the > ground. I was really impressed by the signal strength but capturing > the signal from my AA-30 antenna analyser surely takes the cake :-) > > http://people.physics.anu.edu.au/~dxt103/136/earth/6/ > > Happy to hear your comments on this test. > > 73, Dimitris VK1SV >