Return-Path: Received: (qmail 14274 invoked from network); 31 Jan 2000 16:41:26 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by grants.core.plus.net.uk with SMTP; 31 Jan 2000 16:41:26 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 12FJkb-0003y6-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 31 Jan 2000 16:32:29 +0000 Received: from mailhost.netscapeonline.co.uk ([194.200.20.13]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 12FJkX-0003y1-00 for rsgb_lf_group@blacksheep.org; Mon, 31 Jan 2000 16:32:26 +0000 Received: from as32-s15-148-163.cwci.net ([195.44.148.163] helo=netscapeonline.co.uk) by mailhost.netscapeonline.co.uk with esmtp (Exim 3.02 #1) id 12FJkQ-0006OJ-00 for rsgb_lf_group@blacksheep.org; Mon, 31 Jan 2000 16:32:19 +0000 Message-ID: <3895B8D2.32CBBF32@netscapeonline.co.uk> X-Priority: 3 X-MSMail-Priority: Normal Date: Mon, 31 Jan 2000 16:31:14 +0000 From: "g3kev" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Organization: Netscape Online member X-Mailer: Mozilla 4.6 [en-gb]C-CCK-MCD NetscapeOnline.co.uk (Win95; I) X-Accept-Language: en-GB,en MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org Subject: Re: LF: 8 kHz loading coil References: <000d01bf6a31$3bf336c0$975b97d4@win95.swipnet.se> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Christer Andersson wrote: > 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 Chris. Look around for an old high power AM modulation transformer or choke. You might need a lot of them !!!! otherwise air wound coils would probably better. LF toroids are a possibility for low power. Try a mains variac as a substitute for a variometer !!!!! it might do something, maybe lossy at 8 khz. G3KEV