Return-Path: Received: from mtain-mh10.r1000.mx.aol.com (mtain-mh10.r1000.mx.aol.com [172.29.96.222]) by air-db02.mail.aol.com (v127_r1.1) with ESMTP id MAILINDB021-85ee4b9689ef104; Tue, 09 Mar 2010 12:48:32 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mh10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7C994380000B9; Tue, 9 Mar 2010 12:48:30 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Np3X1-0006Wd-AW for rs_out_1@blacksheep.org; Tue, 09 Mar 2010 17:47:47 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Np3X0-0006WU-VR for rsgb_lf_group@blacksheep.org; Tue, 09 Mar 2010 17:47:46 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Np3Wy-0004bu-CN for rsgb_lf_group@blacksheep.org; Tue, 09 Mar 2010 17:47:46 +0000 Received: from abelian.netcom.co.uk (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 785DC2280B1 for ; Tue, 9 Mar 2010 17:45:12 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by abelian.netcom.co.uk (8.13.1/8.13.1) with ESMTP id o29HlbfZ030567 for ; Tue, 9 Mar 2010 17:47:37 GMT Message-ID: <4B9689B9.8030805@abelian.org> Date: Tue, 09 Mar 2010 17:47:37 +0000 From: Paul Nicholson User-Agent: Thunderbird 2.0.0.14 (X11/20080421) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <9afca2641003090337t4062bb3avc9b952612014c0ba@mail.gmail.com> <4B9678C3.7070907@iup.uni-heidelberg.de> In-Reply-To: <4B9678C3.7070907@iup.uni-heidelberg.de> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Possible VLF HV problems, or not? 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 3039ac1d60de4b9689ee3487 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) I agree with Alexander, 10kV is not so high. If you were looking at > 30kV or 40kV or so, then it might become an issue. But even then it can be controlled at the ends. I think it just has to be tried and the practical limits found. It is good to consider these things as the territory is unfamiliar. Stefan, how will you feed power into the coil? I am running some circuit models to see the effect of harmonics and coil overtones. I want to see how much radiation there is when a drive harmonic hits a coil overtone, as will happen by chance. Will you drive a square wave into the base from a switching amp? No the voltage needed will be too high - perhaps you are using a primary coil or transformer? -- Paul Nicholson --