Return-Path: Received: from mtain-mc01.r1000.mx.aol.com (mtain-mc01.r1000.mx.aol.com [172.29.96.73]) by air-mf04.mail.aol.com (v129.4) with ESMTP id MAILINMF042-8be64d07cfa83d3; Tue, 14 Dec 2010 15:12:24 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mc01.r1000.mx.aol.com (Internet Inbound) with ESMTP id DE452380000B6; Tue, 14 Dec 2010 15:12:22 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PSbDi-0003zX-4O for rs_out_1@blacksheep.org; Tue, 14 Dec 2010 20:11:34 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PSbDh-0003zO-NK for rsgb_lf_group@blacksheep.org; Tue, 14 Dec 2010 20:11:33 +0000 Received: from cavuit02.kulnet.kuleuven.be ([134.58.240.44]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PSbDf-0006rR-5h for rsgb_lf_group@blacksheep.org; Tue, 14 Dec 2010 20:11:33 +0000 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit02.kulnet.kuleuven.be (Postfix) with ESMTP id 18DDF75999E for ; Tue, 14 Dec 2010 21:11:14 +0100 (CET) Received: from ICTS-S-HUB-N1.luna.kuleuven.be (icts-s-hub-n1.luna.kuleuven.be [10.112.9.11]) by smtps01.kuleuven.be (Postfix) with ESMTP id A02BB31E702 for ; Tue, 14 Dec 2010 21:11:14 +0100 (CET) Received: from ICTS-S-EXC2-CA.luna.kuleuven.be ([10.112.11.13]) by ICTS-S-HUB-N1.luna.kuleuven.be ([10.112.9.11]) with mapi; Tue, 14 Dec 2010 21:11:15 +0100 X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe To: "rsgb_lf_group@blacksheep.org" Date: Tue, 14 Dec 2010 21:11:14 +0100 Thread-Topic: LF: BODGE ANTENNAS Thread-Index: AcubwvYz2fUBiaceRIeeuvC9ZFxA5gABsSKi Message-ID: References: <007901cb9bbf$2c223810$0401a8c0@xphd97xgq27nyf>, In-Reply-To: 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: 1.2 (+) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,SUBJ_ALL_CAPS=1.166 Subject: RE: LF: BODGE ANTENNAS Content-Type: multipart/alternative; boundary="_000_BF4A524700075746A6467658DFC7102C886FDD7539ICTSSEXC2CAlu_" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.2 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,LINES_OF_YELLING,SUBJ_ALL_CAPS,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: 3039ac1d60494d07cfa63e2a X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none X-Mailer: Unknown (No Version) --_000_BF4A524700075746A6467658DFC7102C886FDD7539ICTSSEXC2CAlu_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable In my view it does work as a loop antenna on 136 and 500kHz with the loop= area being determined by the soil conductivity (lower conductivity, bigge= r loop area). The very fact that it is low-Q does suggest loss. Hello Roger, if low conductivity =3D large loop area (A) but small antenna current (I) high conductivity =3D small loop area (A) but large antenna current (I) Would this result in A*I =3D constant ? The radiation resistance of a loop is proportional to the square or the lo= op area (A). And the ERP is proportional to the square of the antenna curr= ent (I). If A*I is a constant (independent or soil conductivity) this would mean th= at the ERP would no depend on soil conductivity ? 73, Rik ON7YD - OR7T ________________________________ --_000_BF4A524700075746A6467658DFC7102C886FDD7539ICTSSEXC2CAlu_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
In my view it does work as a loop= antenna on 136 and 500kHz with the loop area being determined by the soil= conductivity (lower conductivity, bigger loop area).  The very fact= that it is low-Q does suggest loss.
 
Hello Roger,
 
if 
low conductivity =3D lar= ge loop area (A) but small antenna current (I)
high conductivity =3D sm= all loop area (A) but large antenna current (I)
Would this result in A*I= =3D constant ?
 
The radiation resistance= of a loop is proportional to the square or the loop area (A). And the ERP= is proportional to the square of the antenna current (I).
If A*I is a constant (in= dependent or soil conductivity) this would mean that the ERP would no depe= nd on soil conductivity ?
 
73, Rik  ON7YD - OR= 7T 
 
 
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