Return-Path: Received: (qmail 580 invoked from network); 30 Jan 2000 07:46:50 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 30 Jan 2000 07:46:50 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12Eoyz-0007Wa-00 for rsgb_lf_group-outgoing@blacksheep.org; Sun, 30 Jan 2000 07:41:17 +0000 Received: from irwell.zetnet.co.uk ([194.247.47.48] ident=root) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12Eoyy-0007WV-00 for rsgb_lf_group@blacksheep.org; Sun, 30 Jan 2000 07:41:17 +0000 Received: from oemcomputer (man-064.dialup.zetnet.co.uk [194.247.41.79]) by irwell.zetnet.co.uk (8.9.3/8.9.3/Debian/GNU) with SMTP id HAA13682 for ; Sun, 30 Jan 2000 07:41:10 GMT Message-ID: <000001bf6af3$21ac4b40$4f29f7c2@oemcomputer> From: "John Rabson" To: rsgb_lf_group@blacksheep.org References: <000d01bf6a31$3bf336c0$975b97d4@win95.swipnet.se> Subject: LF: Re: 8 kHz loading coil Date: Sat, 29 Jan 2000 18:15:49 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.00.2615.200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Christer, With the figures you give I estimate you will be getting about 100 KV across the inductor. An air-cored coil , of substantial size, would seem to be the best way of doing things. By the way, in the early days of Rugby Radio (GBR) on 16 kHz they had some trouble with their loading coil . It appears that it overheated, and set fire to the wooden building in which it was housed! 73 John Rabson G3PAI ----- Original Message ----- From: Christer Andersson To: RSGB LF group Sent: Saturday, January 29, 2000 8:17 AM Subject: LF: 8 kHz loading coil > Hello (V)LF experimenters, > > I have an idea of resonating my existing vertical on 8 kHz. > Is there a practical way to construct a 600 mH loading coil, withstanding 3-4 A and high voltage? > Any *large* toroids on the market?' > > /Christer > sm6pxj > > > >