Return-Path: Received: from mtain-da07.r1000.mx.aol.com (mtain-da07.r1000.mx.aol.com [172.29.64.79]) by air-dd09.mail.aol.com (v127_r1.1) with ESMTP id MAILINDD092-86374b9572d02b5; Mon, 08 Mar 2010 16:57:36 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3B011380000BE; Mon, 8 Mar 2010 16:57:34 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Nokvt-00025V-IC for rs_out_1@blacksheep.org; Mon, 08 Mar 2010 21:56:13 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Nokvt-00025M-6R for rsgb_lf_group@blacksheep.org; Mon, 08 Mar 2010 21:56:13 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Nokvr-0005jB-Eu for rsgb_lf_group@blacksheep.org; Mon, 08 Mar 2010 21:56:13 +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 07BC232784C for ; Mon, 8 Mar 2010 21:53:39 +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 o28Lu4a8004278 for ; Mon, 8 Mar 2010 21:56:04 GMT Message-ID: <4B957274.4020600@abelian.org> Date: Mon, 08 Mar 2010 21:56:04 +0000 From: Paul Nicholson User-Agent: Thunderbird 2.0.0.14 (X11/20080421) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4B8E8027.3060809@iup.uni-heidelberg.de> <4B8EC9A9.80507@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B31@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B9203FE.3000703@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B34@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B92300A.7090604@freenet.de> <38A51B74B884D74083D7950AD0DD85E82A1B37@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B923D2C.1030307@freenet.de> <38A51B74B884D74083D7950AD0DD85E82A1B39@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4B949FC4.6070301@abelian.org> <38A51B74B884D74083D7950AD0DD85E82A1B40@File-Server-HST.hst.e-technik.tu-darmstadt.de> In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B40@File-Server-HST.hst.e-technik.tu-darmstadt.de> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: AW: LF: VLF TX coil ready 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: 3039ac1d404f4b9572ce5ea4 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) > http://www.qrz.com/db/DK7FC Oh, rather a cone shaped coil. That will alter my overtone calculations. They are important if you are driving the coil with a switching waveform, as the system will happily ring on each edge and radiate at the overtone frequencies. > My antenna has C=580pF (measured on 137kHz). When theoretically > calculating the C of a 100m vertical, you achieve almost the > same. Yes, I use a method of moments calculation for the quasi static charge distribution. We can integrate the charge distribution to calculate the effective height fairly accurately. The charge tends to concentrate at the ends of the wire, but not quite a 50/50 split. I'll see if I can do that tomorrow... > i tried to vary the resonance by applying a ferrite rod into > the field (0,1m long and 10mm diameter) but almost nothing > happend! To be expected, the ferrite is small compared to the coil area. > Does anybody of the group want to buy such a kite? The kite isn't the problem. Finding someone to hold on to a 100m kite with 10kV on it surely will be. You need an assistant called Hodges, http://www.lateralscience.co.uk/tesla/glitesla.html -- Paul Nicholson