Return-Path: Received: from mtain-dg05.r1000.mx.aol.com (mtain-dg05.r1000.mx.aol.com [172.29.65.13]) by air-mc06.mail.aol.com (v129.4) with ESMTP id MAILINMC062-a9744c0a5cb123b; Sat, 05 Jun 2010 10:18:25 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 613D8380000AE; Sat, 5 Jun 2010 10:18:22 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OKuBE-000456-69 for rs_out_1@blacksheep.org; Sat, 05 Jun 2010 15:16:56 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OKuBD-00044x-MD for rsgb_lf_group@blacksheep.org; Sat, 05 Jun 2010 15:16:55 +0100 Received: from mailout-us.gmx.com ([74.208.5.67]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OKuBB-0005rS-6H for rsgb_lf_group@blacksheep.org; Sat, 05 Jun 2010 15:16:55 +0100 Received: (qmail invoked by alias); 05 Jun 2010 14:16:46 -0000 Received: from 75-168-143-142.mpls.qwest.net (EHLO [192.168.1.100]) [75.168.143.142] by mail.gmx.com (mp-us001) with SMTP; 05 Jun 2010 10:16:46 -0400 X-Authenticated: #60769621 X-Provags-ID: V01U2FsdGVkX182+NMtBbM2GOEprwqph+28RoHuxutac3PQdjS8QJ I1RCsVrNf6ZcCh Message-ID: <4C0A5C4F.1050506@gmx.com> Date: Sat, 05 Jun 2010 09:16:47 -0500 From: "Mike.WE0H" User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <001401cb02f4$4aa9d130$0401a8c0@xphd97xgq27nyf> <00b701cb030b$c6268d50$0201a8c0@Clemens04> <01CA4D0605FB409ABD7D2F0A98DC46BD@df2py> <4C08002C.5070500@iup.uni-heidelberg.de> <4C09114F.5090605@iup.uni-heidelberg.de> <4C098CA1.6000008@gmx.com> In-Reply-To: X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: VLF: 2km on 8,97 kHz using 6W TX power and a 120m earth antenna 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: 3039ac1d410d4c0a5cae3300 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Hi Roger, That is easy to picture in my mind now. Thank you. Mike WE0H Roger L wrote: > Mike, > > You asked about my earth electrode set-up, so I'll try to describe it. > > At the bottom of the back garden I have a copper earth rod about 1.5m > long driven into the soil. Here the soil is chalky "clunch". From this > earth rod a 2mm diameter PVC covered wire comes up 2m and then runs 10m > along the top of the fence before coming up to the bedroom. In the > bedroom another short wire 2m long connects to the central heating > radiator. A coax cable about 10m long runs back to the TX in the front > bedroom effectively bringing the two electrodes to the audio TX > connected via a step-up toroidal transformer. > > Ignoring the loop within the ground, there is about 30 sq m of loop > area in the air. I want to try just an air loop (no ground electrodes) > to compare signal level at maximum range. > > Before using the radiator and house pipes as the second electrode I had > two 1.5m copper rods 10m nearer the house than the "far" electrode. > This one had a baseline of 10m only and was less effective. > > I'll try to do a drawing and put it on here later. > > 73s > Roger G3XBM