Return-Path: Received: from mtain-mg10.r1000.mx.aol.com (mtain-mg10.r1000.mx.aol.com [172.29.96.210]) by air-dd05.mail.aol.com (v129.4) with ESMTP id MAILINDD053-865b4c21bbc0192; Wed, 23 Jun 2010 03:46:08 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mg10.r1000.mx.aol.com (Internet Inbound) with ESMTP id C73BA38000082; Wed, 23 Jun 2010 03:46:05 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1ORKe4-0002xI-Cb for rs_out_1@blacksheep.org; Wed, 23 Jun 2010 08:45:16 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1ORKe3-0002x9-U5 for rsgb_lf_group@blacksheep.org; Wed, 23 Jun 2010 08:45:15 +0100 Received: from relay2.uni-heidelberg.de ([129.206.210.211]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1ORKe3-0006Cw-0R for rsgb_lf_group@blacksheep.org; Wed, 23 Jun 2010 08:45:15 +0100 Received: from freitag.iup.uni-heidelberg.de (freitag.iup.uni-heidelberg.de [129.206.29.204]) by relay2.uni-heidelberg.de (8.13.8/8.13.8) with ESMTP id o5N7jL6B016836 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Wed, 23 Jun 2010 09:45:21 +0200 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 o5N7jDpW021114 for ; Wed, 23 Jun 2010 09:45:13 +0200 Message-ID: <4C21BB5D.50004@iup.uni-heidelberg.de> Date: Wed, 23 Jun 2010 09:44:29 +0200 From: =?ISO-8859-1?Q?Stefan_Sch=E4fer?= User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: , In-Reply-To: X-Spam-Score: 2.1 (++) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001,RATWARE_GECKO_BUILD=1.426,SUBJ_HAS_SPACES=0.651 Subject: Re: LF: RE: VLF QRP Earth mode: 5.1km DX tonight but no such thing as a free lunch Content-Type: multipart/alternative; boundary="------------010408070202080405080500" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_40_50,HTML_FONTCOLOR_BLUE, HTML_MESSAGE,SUBJ_HAS_SPACES 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: 3039ac1d60d24c21bbbd2161 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) --------------010408070202080405080500 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Rik, Roger, VLF, What i want to try is to "couple" two rivulets that are running down on different sides of a mountain. Each one could act as a conductor regarding the different conductances of water and stones. On the top of the hill the rivulets are thinner, so a short cut effect could be reduced. But currently the QRN is very strong and so this could take some time until i reach my 5 km distance... 73 and have fun, Stefan/DK7FC Am 23.06.2010 09:15, schrieb Rik Strobbe: > Yet another thought: > salt water is a rather good conductor. > What about a couple of rods into the sea near Dover and another > pair near Cap Griz Nez ? > Distance is 34 km. > 73, Rik ON7YD > ------------------------------------------------------------------------ > *Van:* owner-rsgb_lf_group@blacksheep.org > [owner-rsgb_lf_group@blacksheep.org] namens Rik Strobbe > [Rik.Strobbe@fys.kuleuven.be] > *Verzonden:* woensdag 23 juni 2010 9:00 > *Aan:* rsgb_lf_group@blacksheep.org > *Onderwerp:* LF: RE: VLF QRP Earth mode: 5.1km DX tonight but no such > thing as a free lunch > > 1. *At greater distances (3-5kms) the signal reaches its > destination by conduction through the ground aided by pipes in > the roads and with inductive coupling into the loop at the RX.* > > Roger, > very interesting. > There are huge gas pipelines running across the country (and even > across Europe). > I wonder how far one would get with a ground antenna near one of these. > The 2 rods of the ground antenna each at one side of the pipeline > would give optimal coupling. > 73, Rik ON7YD --------------010408070202080405080500 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Rik, Roger, VLF,

What i want to try is to "couple" two rivulets that are running down on different sides of a mountain. Each one could act as a conductor regarding the different conductances of water and stones. On the top of the hill the rivulets are thinner, so a short cut effect could be reduced. But currently the QRN is very strong and so this could take some time until i reach my 5 km distance...

73 and have fun,

Stefan/DK7FC


Am 23.06.2010 09:15, schrieb Rik Strobbe:
Yet another thought:
 
salt water is a rather good conductor.
What about a couple of rods into the sea near Dover and another pair near Cap Griz Nez ?
Distance is 34 km.
 
73, Rik  ON7YD
 
Van: owner-rsgb_lf_group@blacksheep.org [owner-rsgb_lf_group@blacksheep.org] namens Rik Strobbe [Rik.Strobbe@fys.kuleuven.be]
Verzonden: woensdag 23 juni 2010 9:00
Aan: rsgb_lf_group@blacksheep.org
Onderwerp: LF: RE: VLF QRP Earth mode: 5.1km DX tonight but no such thing as a free lunch

  1. At greater distances (3-5kms) the signal reaches its destination by conduction through the ground aided by pipes in the roads and with inductive coupling into the loop at the RX.
Roger,
 
very interesting.
There are huge gas pipelines running across the country (and even across Europe).
I wonder how far one would get with a ground antenna near one of these.
The 2 rods of the ground antenna each at one side of the pipeline would give optimal coupling.
 
73, Rik  ON7YD
 
 
 
 
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