Return-Path: Received: (qmail 42296 invoked from network); 9 Jan 2005 05:30:38 -0000 Received: from unknown (HELO ptb-spamcore02.plus.net) (192.168.71.3) by ptb-mailstore01.plus.net with SMTP; 9 Jan 2005 05:30:38 -0000 Received: from mailnull by ptb-spamcore02.plus.net with spamcore-l-b (Exim 4.32; FreeBSD) id 1CnVeG-0007n7-Gq for dave@picks.force9.co.uk; Sun, 09 Jan 2005 05:29:57 +0000 Received: from [192.168.67.3] (helo=ptb-mxcore03.plus.net) by ptb-spamcore02.plus.net with esmtp (Exim 4.32; FreeBSD) id 1CnVeF-0007mh-7t for dave@picks.force9.co.uk; Sun, 09 Jan 2005 05:29:55 +0000 Received: from post.thorcom.com ([193.82.116.20]) by ptb-mxcore03.plus.net with esmtp (Exim) id 1CnVes-00007l-Pg for dave@picks.force9.co.uk; Sun, 09 Jan 2005 05:30:34 +0000 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1CnVcY-0002h3-7I for rs_out_1@blacksheep.org; Sun, 09 Jan 2005 05:28:10 +0000 Received: from [193.82.116.30] (helo=relay.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1CnVcX-0002gu-SR for rsgb_lf_group@blacksheep.org; Sun, 09 Jan 2005 05:28:09 +0000 Received: from relay.sotline.ru ([80.89.139.226]) by relay.thorcom.net with esmtp (Exim 4.43) id 1CnVcW-00083H-6I for rsgb_lf_group@blacksheep.org; Sun, 09 Jan 2005 05:28:09 +0000 Received: from astral.omskcity.com (mxs.sotline.ru [80.89.139.227]) by relay.sotline.ru (8.12.8p2/8.12.8) with ESMTP id j095S55n038487 for ; Sun, 9 Jan 2005 11:28:05 +0600 (OMST) (envelope-from fitec@omskcity.com) Received: from noname.nodomain.nowhere (host196.m02.dial.sotline.ru [81.176.51.196]) by astral.omskcity.com (8.x.x) with ESMTP id j095S2es025421 for ; Sun, 9 Jan 2005 11:28:03 +0600 (OS) Received: from localhost (fitec@localhost) by noname.nodomain.nowhere (8.8.5/8.8.5) with SMTP id LAA00254 for ; Sun, 9 Jan 2005 11:46:33 GMT X-Authentication-Warning: noname.nodomain.nowhere: fitec owned process doing -bs Date: Sun, 9 Jan 2005 11:46:33 +0000 (GMT) From: "Alexander S. Yurkov" To: rsgb_lf_group@blacksheep.org In-Reply-To: <001501c4f600$13060110$6401a8c0@eagles> Message-ID: MIME-Version: 1.0 X-SPF-Result: relay.thorcom.net: domain of omskcity.com designates 80.89.139.226 as permitted sender X-Spam-Score: 1.3 (+) X-Spam-Report: autolearn=no,DATE_IN_FUTURE_06_12=1.202,FORGED_RCVD_HELO=0.05 Subject: Re: LF: Antenna plans de J. Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.9 required=5.0 tests=DATE_IN_FUTURE_06_12 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-Spam-Filtered: by PlusNet SpamCORE (v3.00) Content-transfer-encoding: 8bit On Sun, 9 Jan 2005, J. Allen wrote: > > Elnec was correct, but I made a typographical error. The decimal was one > place off. It is 0.2053 Ohms, not 0.02053 Ohms, and is close to the 0.16 > figure you had for an antenna height of 20 meters. O! This is absolutely reasonable. > > The tower height will be 29 meters 1600(29/220)^2=0.278 This should be true if capacitance of top load is much grater then capacitance of vertical wire. But Your topload is not absolutely horisontal. Current in such a 'horisontal' wire will decrease effective height. at the point of attachment to the two > horizontal capacitance wires, each 392 feet 119.5 meters long and averaging > 20 meters high including sag. Aproximatly: (29+20)/2=24.5 1600(24.5/2200)^2=0.198 and no nec is needed :-) 73 de RA9MB/Alex http://www.qsl.net/ra9mb