Return-Path: Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 166EA3800009D; Sun, 6 Nov 2011 15:53:22 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1RN9hq-0001dg-QE for rs_out_1@blacksheep.org; Sun, 06 Nov 2011 20:52:42 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1RN9hq-0001dS-4V for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 20:52:42 +0000 Received: from mout1.freenet.de ([195.4.92.91]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1RN9hp-00039Y-1V for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 20:52:42 +0000 Received: from [195.4.92.142] (helo=mjail2.freenet.de) by mout1.freenet.de with esmtpa (ID dl4yhf@freenet.de) (port 25) (Exim 4.76 #5) id 1RN9ho-0001Zz-44 for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 21:52:40 +0100 Received: from localhost ([::1]:35582 helo=mjail2.freenet.de) by mjail2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.76 #1) id 1RN9hn-0006zA-PC for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 21:52:40 +0100 Received: from [195.4.92.14] (port=42736 helo=4.mx.freenet.de) by mjail2.freenet.de with esmtpa (ID dl4yhf@freenet.de) (Exim 4.76 #1) id 1RN9fd-0006HG-NA for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 21:50:25 +0100 Received: from blfd-4db1b536.pool.mediaways.net ([77.177.181.54]:3390 helo=[192.168.178.21]) by 4.mx.freenet.de with esmtpsa (ID dl4yhf@freenet.de) (TLSv1:CAMELLIA256-SHA:256) (port 465) (Exim 4.76 #1) id 1RN9fd-0003oS-EY for rsgb_lf_group@blacksheep.org; Sun, 06 Nov 2011 21:50:25 +0100 Message-ID: <4EB6F30F.7040207@freenet.de> Date: Sun, 06 Nov 2011 21:50:23 +0100 From: wolf_dl4yhf User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4EB6E548.7010206@iup.uni-heidelberg.de> In-Reply-To: <4EB6E548.7010206@iup.uni-heidelberg.de> X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: Arcing... Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 8bit 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: 0:2:438050848:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1db4054eb6f3c23141 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none At least the arc has burnt the cobwebs ;-) Hope the stainless steel tubing (with the laboratory clamps) in the background are not the intake of an air-pollution monitor. If it was, it may ring an alarm due to a sudden NOx increase.. Nice pictures with the Nikon D700 ! Cheers, Wolf . Am 06.11.2011 20:51, schrieb Stefan Schäfer: > 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 > > >