Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dl01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 9A4E6380000A3; Sat, 30 Jun 2012 15:15:42 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Sl37y-00087X-Qz for rs_out_1@blacksheep.org; Sat, 30 Jun 2012 20:14:42 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Sl37x-00087N-LM for rsgb_lf_group@blacksheep.org; Sat, 30 Jun 2012 20:14:41 +0100 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 1Sl37w-0007Od-3Y for rsgb_lf_group@blacksheep.org; Sat, 30 Jun 2012 20:14:40 +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 q5UJEdGU020419 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sat, 30 Jun 2012 21:14:39 +0200 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 q5UJEdhB030237 for ; Sat, 30 Jun 2012 21:14:39 +0200 Message-ID: <4FEF4FAB.2010103@iup.uni-heidelberg.de> Date: Sat, 30 Jun 2012 21:12:43 +0200 From: =?ISO-8859-15?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 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: MF, About the 630m band dipoles i remember a story: In late 2008 i started with the 100m kite experiments and used J-antennas for 160m. That worked excellent. Matching was done with a 28m long RG58 cable. The losses couldn't have been to high since i run 600W RF and nothing became significantly warm. One evening i was in QSO with a German station while it started to rain. If the kite becomes wet, the wind has to be stronger or at least stable to keep it in the sky. So it was a question of time until the kite falls down. It was completely dark and i didn't see the kite. The QSO partner became weaker and the QRN was down. Later i saw that the kite was stretched on the wet ground. The SWR was down but anyway it was possible to hear the other station and it was possible to finish the QSO!!! That was exactly the location where i did the VLF kite experiments in 2010/11. The ground conductivity must be "fair" there. [...] 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 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-Scan-Signature: 7001055fa59a9c23b9831ea6d317a074 Subject: LF: MF dipole 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-SCOLL-SCORE: 0:2:437713024:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d4acf4fef505e5484 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none MF, About the 630m band dipoles i remember a story: In late 2008 i started with the 100m kite experiments and used J-antennas for 160m. That worked excellent. Matching was done with a 28m long RG58 cable. The losses couldn't have been to high since i run 600W RF and nothing became significantly warm. One evening i was in QSO with a German station while it started to rain. If the kite becomes wet, the wind has to be stronger or at least stable to keep it in the sky. So it was a question of time until the kite falls down. It was completely dark and i didn't see the kite. The QSO partner became weaker and the QRN was down. Later i saw that the kite was stretched on the wet ground. The SWR was down but anyway it was possible to hear the other station and it was possible to finish the QSO!!! That was exactly the location where i did the VLF kite experiments in 2010/11. The ground conductivity must be "fair" there. So, if this is possible with a J antenna on the ground (should behave about like a dipole on the ground (?) ), it must work on MF too. Or am i wrong? That means, for a MF dipole test i would start to try to lay it on the ground. If this works with reasonable efficiency, so that a QSO is possible, it would be a simple solution for a quick /p MF antenna that can find its place in a back pack! What do the experts think? :-) 73, Stefan/DK7FC