Return-Path: Received: from mtain-dk08.r1000.mx.aol.com (mtain-dk08.r1000.mx.aol.com [172.29.180.12]) by air-mf08.mail.aol.com (v129.4) with ESMTP id MAILINMF083-8bf74cddaf57250; Fri, 12 Nov 2010 16:19:19 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dk08.r1000.mx.aol.com (Internet Inbound) with ESMTP id E19F238000181; Fri, 12 Nov 2010 16:19:16 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PH0zt-0001Gj-6I for rs_out_1@blacksheep.org; Fri, 12 Nov 2010 21:17:25 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PH0zs-0001Ga-Nk for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 21:17:24 +0000 Received: from warsl404pip3.highway.telekom.at ([195.3.96.115] helo=email.aon.at) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PH0zq-0002fp-87 for rsgb_lf_group@blacksheep.org; Fri, 12 Nov 2010 21:17:24 +0000 Received: (qmail 21001 invoked from network); 12 Nov 2010 21:17:15 -0000 Received: from 91-115-31-145.adsl.highway.telekom.at (HELO [192.168.1.101]) ([91.115.31.145]) (envelope-sender ) by smarthub93.highway.telekom.at (qmail-ldap-1.03) with SMTP for ; 12 Nov 2010 21:17:15 -0000 From: Gerhard Hickl To: rsgb_lf_group@blacksheep.org In-Reply-To: References: Date: Fri, 12 Nov 2010 22:17:16 +0100 Message-ID: <1289596636.2682.17.camel@gerhard-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 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: 3039ac1db40c4cddaf54141e X-AOL-IP: 195.171.43.25 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