Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mg02.r1000.mx.aol.com (Internet Inbound) with ESMTP id 349B6380000E4; Thu, 24 Jan 2013 15:39:01 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1TyTIn-0003qC-GN for rs_out_1@blacksheep.org; Thu, 24 Jan 2013 20:21:37 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1TyTIn-0003q0-36 for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2013 20:21:37 +0000 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtps (TLSv1:AES256-SHA:256) (Exim 4.77) (envelope-from ) id 1TyTIj-0007J3-UY for rsgb_lf_group@blacksheep.org; Thu, 24 Jan 2013 20:21:35 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id r0OKLXr0021330 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Thu, 24 Jan 2013 21:21:33 +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 r0OKLWLS024794 for ; Thu, 24 Jan 2013 21:21:32 +0100 Message-ID: <510197C8.7030502@iup.uni-heidelberg.de> Date: Thu, 24 Jan 2013 21:21:28 +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: In-Reply-To: X-Spam-Score: -2.3 (--) 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: Dimitris, Thank you for another nice experiment and website. I enjoy the entertainment and am once again appeased to see that i'm not the only crazy man with similar hobbies :-) I guess that the radiation resistance of that wire is much higher, due to the lower wavelength. And since the ground conductivity is rather poor ( another guess), a dipole on the ground seems to work better than a lossy loop into the ground... [...] Content analysis details: (-2.3 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at http://www.dnswl.org/, medium trust [129.206.210.211 listed in list.dnswl.org] -0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 4e3b1488273adbbe9757d6bdd5adf219 Subject: Re: LF: 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: 3039ac1d60ca51019be40338 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Dimitris, Thank you for another nice experiment and website. I enjoy the entertainment and am once again appeased to see that i'm not the only crazy man with similar hobbies :-) I guess that the radiation resistance of that wire is much higher, due to the lower wavelength. And since the ground conductivity is rather poor ( another guess), a dipole on the ground seems to work better than a lossy loop into the ground... What about a real dipole on the ground? Your wire has the necessary length and you are more flexible because you don't need a ground. You could even try two dipoles in a vertical arrangement and try to get some infos about tthe radiation pattern of the antenna. I guess that a dipole (center feed) works better than a half wave wire (end feed) with a ground rod. Vy 73, Stefan/DK7FC Am 23.01.2013 05:42, schrieb Dimitrios Tsifakis: > 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 >