Return-Path: Received: from mtain-mh08.r1000.mx.aol.com (mtain-mh08.r1000.mx.aol.com [172.29.96.220]) by air-me03.mail.aol.com (v127_r1.1) with ESMTP id MAILINME033-8baa4b85388d27b; Wed, 24 Feb 2010 09:32:45 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mh08.r1000.mx.aol.com (Internet Inbound) with ESMTP id AA4EC38000127; Wed, 24 Feb 2010 09:32:43 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NkIGX-0005Pn-En for rs_out_1@blacksheep.org; Wed, 24 Feb 2010 14:31:05 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NkIGX-0005Pe-3e for rsgb_lf_group@blacksheep.org; Wed, 24 Feb 2010 14:31:05 +0000 Received: from mx.omskcity.com ([79.133.160.2]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NkIGV-0004RN-3Z for rsgb_lf_group@blacksheep.org; Wed, 24 Feb 2010 14:31:05 +0000 Received: from noname.nodomain.nowhere (host209.161-133-79.sotline.ru [79.133.161.209]) by mx.omskcity.com (8.13.6/8.13.6) with ESMTP id o1OEUrTT046638 for ; Wed, 24 Feb 2010 20:30:59 +0600 (OMST) (envelope-from fitec@omskcity.com) Received: from localhost (fitec@localhost) by noname.nodomain.nowhere (8.8.5/8.8.5) with SMTP id VAA00271 for ; Wed, 24 Feb 2010 21:35:46 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Wed, 24 Feb 2010 21:35:45 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B13@File-Server-HST.hst.e-technik.tu-darmstadt.de> Message-ID: MIME-Version: 1.0 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.1.8 (mx.omskcity.com [79.133.160.2]); Wed, 24 Feb 2010 20:31:00 +0600 (OMST) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: AW: LF: VLF_8.79 kHz_grounding systems Content-Type: TEXT/PLAIN; charset=US-ASCII 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: 3039ac1d60dc4b85388b640d X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) > > So, the coil losses decrease with it's L (assuming a given wire diameter, > coil diameter and spacing and so on) and thus it is good to decrease the > needed L. You can decrease L only by condenser in parallel with a antenna. But then only part of coil current will flow thrue the ant (and ground stake also). Let's describe some numerical example. Let antenna capacity (denoted as Ca) is 1 nF (large antenna!). Resistance of grounding we assume 1000 Ohm (huge resistance!). Parralel C (Cp) we assume to be 100 nF. Then L=3.2 mH. Let coil resistance is 1 Ohm (large coil!) and coil current I is 1 A. Then coil loss is 1 W. Antenna current for Ca<