Return-Path: Received: from mtain-dg09.r1000.mx.aol.com (mtain-dg09.r1000.mx.aol.com [172.29.65.17]) by air-ma07.mail.aol.com (v129.4) with ESMTP id MAILINMA074-b52f4c45e68c194; Tue, 20 Jul 2010 14:10:20 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg09.r1000.mx.aol.com (Internet Inbound) with ESMTP id CA9D2380000A9; Tue, 20 Jul 2010 14:10:18 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ObHFm-0003Mt-05 for rs_out_1@blacksheep.org; Tue, 20 Jul 2010 19:09:18 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ObHFl-0003Mk-JG for rsgb_lf_group@blacksheep.org; Tue, 20 Jul 2010 19:09:17 +0100 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1ObHFk-0008DM-VD for rsgb_lf_group@blacksheep.org; Tue, 20 Jul 2010 19:09:17 +0100 Received: from smtps02.kuleuven.be (smtpshost02.kulnet.kuleuven.be [134.58.240.75]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 98443758953 for ; Tue, 20 Jul 2010 20:09:04 +0200 (CEST) Received: from ICTS-S-HUB-N3.luna.kuleuven.be (icts-s-hub-n3.luna.kuleuven.be [10.112.9.13]) by smtps02.kuleuven.be (Postfix) with ESMTP id 985AAF3862 for ; Tue, 20 Jul 2010 20:09:04 +0200 (CEST) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N3.luna.kuleuven.be ([10.112.9.13]) with mapi; Tue, 20 Jul 2010 20:09:04 +0200 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Tue, 20 Jul 2010 20:09:04 +0200 Thread-Topic: earth antenna Thread-Index: AcsoNHH5fxffznu+QEmpIUEzcl6ZhAAATIBc Message-ID: References: <4C44B478.7000109@iup.uni-heidelberg.de>,<4C45E1CA.6010003@iup.uni-heidelberg.de> In-Reply-To: <4C45E1CA.6010003@iup.uni-heidelberg.de> Accept-Language: nl-NL, nl-BE Content-Language: nl-BE X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: nl-NL, nl-BE MIME-Version: 1.0 X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: LF: RE: earth antenna Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C51094D0E53ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,TO_ADDRESS_EQ_REAL 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: 3039ac1d41114c45e68a6619 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C51094D0E53ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Any bets about the signal increase when increasing the spacing from 280m= to 600m? Stefan, based on the theory that an earth antenna is a loop and assuming that the= "height" of the loop remains unchanged, increasing the length from 280m= to 600m should increase the loop area (A) by 2.14 . As the radiation resistance of a loop is proportional the A^2 the radiatio= n resistance should increase by 4.6. If the loss resistance remains unchanged the improvement should be almost= 7dB. But notice the use of assuming, should and if ... so just a guess. 73, Rik ON7YD --_000_BF4A524700075746A6467658DFC7102C51094D0E53ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Any bets about the signal increase when= increasing the spacing from 280m to 600m?

Stefan,
 
based on the theory that an earth an= tenna is a loop  and assuming that the "height" of the= loop remains unchanged, increasing the length from 280m to 600m should in= crease the loop area (A) by 2.14 .
As the radiation resistance of a loo= p is proportional the A^2 the radiation resistance should increase by 4.6.=
If the loss resistance remains uncha= nged the improvement should be almost 7dB.
 
But notice the use of assuming, shou= ld and if ... so just a guess.
 
73, Rik  ON7YD
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