Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dg03.r1000.mx.aol.com (Internet Inbound) with ESMTP id 8C12F38000095; Sun, 6 Nov 2011 14:53:36 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RN8ls-0001Bm-1S for rs_out_1@blacksheep.org; Sun, 06 Nov 2011 19:52:48 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RN8lr-0001Bd-Lx for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 19:52:47 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RN8lq-0002jc-PY for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 19:52:47 +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 pA6Jqj9g016708 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Sun, 6 Nov 2011 20:52:45 +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 pA6Jqk6I014067 for ; Sun, 6 Nov 2011 20:52:46 +0100 Message-ID: <4EB6E548.7010206@iup.uni-heidelberg.de> Date: Sun, 06 Nov 2011 20:51:36 +0100 From: =?ISO-8859-15?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: LF: Arcing... 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: 0:2:423682816:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d410b4eb6e5c01e99 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none Seems i need some improvements on the spark gap of my LF antenna. Depending on the humidity and wind there is some arcing during the transmissions. These look very fascinating i find. Anyway i have to add a spherical electrode there and increase the gap distance, especially for VLF ;-) A working colleague of me is a (semi) proffessional photographer (hobby) and i asked him to take some nice pictures. He has an excellent equipment i find but he means he should have taken a different lens for these pictures. Anyway, i really like them. When arcing at the ends of a LF antenna is discussed, sometimes a picture can help a newcomer what is meant. Here are some more examples, in high resolution (abt. 3 MB each) http://dl.dropbox.com/u/19882028/LF/20111106-19h54m07s-FF7_8461.jpg http://dl.dropbox.com/u/19882028/LF/20111106-19h58m31s-FF7_8466.jpg http://dl.dropbox.com/u/19882028/LF/20111106-20h02m13s-FF7_8470.jpg http://dl.dropbox.com/u/19882028/LF/20111106-20h03m58s-FF7_8472.jpg 73, Stefan/DK7FC