Return-Path: Received: from mtain-mb06.r1000.mx.aol.com (mtain-mb06.r1000.mx.aol.com [172.29.96.26]) by air-de06.mail.aol.com (v127_r1.1) with ESMTP id MAILINDE061-5eb64b8e7f29108; Wed, 03 Mar 2010 10:24:25 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mb06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7BE8A3800016B; Wed, 3 Mar 2010 10:24:24 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmqQ3-0007AE-0e for rs_out_1@blacksheep.org; Wed, 03 Mar 2010 15:23:27 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmqQ2-0007A5-Hf for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:23:26 +0000 Received: from relay.uni-heidelberg.de ([129.206.100.212]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmqQ1-0007r5-Ob for rsgb_lf_group@blacksheep.org; Wed, 03 Mar 2010 15:23:26 +0000 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay.uni-heidelberg.de (8.14.1/8.14.1) with ESMTP id o23FNMLD008578 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 3 Mar 2010 16:23:22 +0100 Received: from [129.206.29.99] (pc99.iup.uni-heidelberg.de [129.206.29.99]) by freitag.iup.uni-heidelberg.de (8.12.11.20060308/8.11.2) with ESMTP id o23FNPnG013975 for ; Wed, 3 Mar 2010 16:23:25 +0100 Message-ID: <4B8E7F8A.8080201@iup.uni-heidelberg.de> Date: Wed, 03 Mar 2010 16:26:02 +0100 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.7) Gecko/20100111 Thunderbird/3.0.1 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org X-Spam-Score: 1.4 (+) X-Spam-Report: autolearn=disabled,RATWARE_GECKO_BUILD=1.426 Subject: Re: LF: TX- Loop for 136kHz Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: 3039ac1d601a4b8e7f284b30 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) But Uwe, With a 100m Vertical you reach 1W ERP with 20W TX power! So 1,2kW will be 60W ERP on 137kHz ;-) If you think about the ratio between achieved signal to the effort you have, this may be an alternative ;-) 73, Stefan Am 03.03.2010 12:26, schrieb Warren Ziegler: > Uwe, > > I use a loop for transmitting on 137kHz. the loop is made up of > coaxial cable with 2 turns in parallel spaced 3 meters apart. > The loops are approx. 24 meters vertical by 44 meters horizontal dimension. > With 1200 watts of transmitter power output, I achieve an ERP of 4 > watts (measured). > > The tuner is built to withstand high currents and voltages. > I have had several small fires when wires were too close together. > >