Return-Path: Received: from mtain-dd08.r1000.mx.aol.com (mtain-dd08.r1000.mx.aol.com [172.29.64.148]) by air-mb04.mail.aol.com (v129.4) with ESMTP id MAILINMB041-a2394cddbcf6293; Fri, 12 Nov 2010 17:17:26 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dd08.r1000.mx.aol.com (Internet Inbound) with ESMTP id EFEFA380002BC; Fri, 12 Nov 2010 17:17:24 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PH1ud-0001d4-1g for rs_out_1@blacksheep.org; Fri, 12 Nov 2010 22:16:03 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PH1uc-0001cv-Kj for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 22:16:02 +0000 Received: from out1.ip08ir2.opaltelecom.net ([62.24.128.244]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PH1ua-00039B-A7 for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 22:16:02 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AowTAG9L3UxcHYpY/2dsb2JhbACDPIRGjFaNf3EEAa14kH+BIoM1cwSNfQ X-IronPort-AV: E=Sophos;i="4.59,189,1288569600"; d="scan'208";a="468516902" Received: from unknown (HELO your91hoehfy9g) ([92.29.138.88]) by out1.ip08ir2.opaltelecom.net with SMTP; 12 Nov 2010 22:15:53 +0000 Message-ID: <000f01cb82b7$3175c960$0301a8c0@your91hoehfy9g> From: "mal hamilton" To: References: <1289596636.2682.17.camel@gerhard-desktop> Date: Fri, 12 Nov 2010 22:16:02 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: LF Coils Content-Type: text/plain; charset="UTF-8" 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: 3039ac1d40944cddbcf46444 X-AOL-IP: 195.171.43.25 What frequency are you discussing ? g3kev ----- Original Message ----- From: "Gerhard Hickl" To: Sent: Friday, November 12, 2010 9:17 PM Subject: Re: LF: LF Coils > Hi Ken! > > It all depends on the antenna your are going to feed with this loading > coil. My system has a capacitive load of abt. 600pf and so the coil is > abt. 2,3mH. This is realized on a flower pot with about 40cm diameter, > 80 turns of insulated wire. The height of the pot is only 30cm. > > If you have a smaller capacitive load, you'll need more inductance and > thus increasing the diameter of the coil-body. > > If you count 6pf per meter for every vertical part of your antenna and > 5pf/m for every horizontal part, you can estimate the capacitive load > very well. For calculation of L and C for a given frequency or for > dimensioning air-coils (Luftspulen), I can recommend the > "Mini-Ringkernrechner"... > > http://www.dl5swb.de/html/mini_ringkern-rechner.htm > > I don't remember if there's an option for the language on installation > but even if it's only in German, it easy to operate. > > 73 > > OE3GHB > Gerhard > > > > > > Am Donnerstag, den 11.11.2010, 20:28 +0000 schrieb Ken: > > Hello Everyone. > > I went into a branch of Wilkinsons (Watford), today, and saw some > > straight sided cylindrical dust bins about 0.5m diameter, useful for > > large coils? > > > > 73 > > Ken > > M0KHW IO91TV > > >