Return-Path: Received: from mtain-dh04.r1000.mx.aol.com (mtain-dh04.r1000.mx.aol.com [172.29.65.24]) by air-de04.mail.aol.com (v129.4) with ESMTP id MAILINDE044-5eb14c0e508e1ba; Tue, 08 Jun 2010 10:15:42 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh04.r1000.mx.aol.com (Internet Inbound) with ESMTP id E7BE23800010F; Tue, 8 Jun 2010 10:15:39 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OLzZi-0001nw-Me for rs_out_1@blacksheep.org; Tue, 08 Jun 2010 15:14:42 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OLzZi-0001nn-Ap for rsgb_lf_group@blacksheep.org; Tue, 08 Jun 2010 15:14:42 +0100 Received: from out1.ip02ir2.opaltelecom.net ([62.24.128.238]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OLzZg-000474-BP for rsgb_lf_group@blacksheep.org; Tue, 08 Jun 2010 15:14:42 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiENAH7tDUxOk8/d/2dsb2JhbACHY4pNjBNxvhGFFgQ X-IronPort-AV: E=Sophos;i="4.53,384,1272841200"; d="scan'208";a="325054935" Received: from unknown (HELO xphd97xgq27nyf) ([78.147.207.221]) by out1.ip02ir2.opaltelecom.net with SMTP; 08 Jun 2010 15:14:34 +0100 Message-ID: <004c01cb0714$e98503a0$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <003201cb070d$9e75a330$0401a8c0@xphd97xgq27nyf> <8503823EEAF14A7DAD78F7A61BF0210E@Hugh> Date: Tue, 8 Jun 2010 15:14:30 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Re: COIL WINDING THOUGHT Content-Type: text/plain; charset="iso-8859-1" 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=0.0 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-sid: 3039ac1d41184c0e508b12c9 X-AOL-IP: 193.82.116.20 Hugh The same applies to single layer thin enamel/formvar wire close wound. For small loading coils in my case on 137 kcs I use 2.5mm with thick plastic insulation or litz 3mm 726 strand single layer, less than 500uH in my case. Multi wind is satisfactory for a few hundred volts or low kilowatts but not megawatts. mal/g3kev ----- Original Message ----- From: "Hugh_m0wye" To: Sent: Tuesday, June 08, 2010 2:57 PM Subject: LF: Re: COIL WINDING THOUGHT > This method of winding increases the interwinding capacitance, and also > lowers the breakdown voltage of the overall coil, because adjascent turns > have a higher potential between them. When I wound my loading coil, I > deliberately used single layer winding to maximise the voltage handling. > Hugh M0WYE > > ----- Original Message ----- > From: "mal hamilton" > To: "rsgb" > Sent: Tuesday, June 08, 2010 2:22 PM > Subject: LF: COIL WINDING THOUGHT > > > A reel of 6 core insulated strands 200 metres long becomes 1200 metres a > good reduction in winding time. > g3kev > > >