Return-Path: X-Spam-DCC: paranoid 1290; Body=3 Fuz1=3 Fuz2=3 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=5.0 tests=BAYES_00,DNS_FROM_AHBL_RHSBL, RATWARE_GECKO_BUILD autolearn=no version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id tA9AbtDh012197 for ; Mon, 9 Nov 2015 11:37:55 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Zvjmd-0005l9-O2 for rs_out_1@blacksheep.org; Mon, 09 Nov 2015 10:34:43 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Zvjmd-0005l0-G6 for rsgb_lf_group@blacksheep.org; Mon, 09 Nov 2015 10:34:43 +0000 Received: from smtpout.karoo.kcom.com ([212.50.160.34]) by relay1.thorcom.net with esmtp (Exim 4.86) (envelope-from ) id 1Zvjlk-000179-9O for rsgb_lf_group@blacksheep.org; Mon, 09 Nov 2015 10:34:42 +0000 X-IronPort-AV: E=Sophos;i="5.20,265,1444690800"; d="scan'208";a="143868557" Received: from unknown (HELO [127.0.0.1]) ([109.176.208.58]) by smtpout.karoo.kcom.com with ESMTP; 09 Nov 2015 10:33:31 +0000 Message-ID: <5640767B.6080208@lineone.net> Date: Mon, 09 Nov 2015 10:33:31 +0000 From: LineOne User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.2 MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <1843908200.20151104162925@chriswilson.tv>, , <8E31BC8EB75546E59F99E35AFAAA0DEE@AGB> <563DD93A.22662.37C4EA@mike.dennison.ntlworld.com>,<563FA745.9010002@posteo.de> <7E7DFBB4D102A04DB5ADC88D66628A4A444528AF@ICTS-S-MBX1.luna.kuleuven.be> <563FB921.9040209@abelian.org> In-Reply-To: <563FB921.9040209@abelian.org> X-Scan-Signature: 5c1f37c04fc013ebbc2288fd3791d043 Subject: Re: LF: Capacitive top hat question Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit 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-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 Status: O X-Status: X-Keywords: X-UID: 4936 A dry dune must be mainly silica with some organic matter so a good insulator. I wonder how deep the deposits were? Hugh M0DSZ On 08/11/2015 21:05, Paul Nicholson wrote: > > > I remember to have read somewhere thate (French?) military > > in the Sahara desert just put a dipole antenna on the > > sand on top of a dune and it worked fine. > > Somewhere I have a paper describing something like that. > I recall an antenna at ground level or actually a little > buried, and its effective height was related to the depth > of the water table below the dry sand. Maybe a well or > borehole was used to connect to the 'ground' plane. > > I'll see if I can find it. > -- > Paul Nicholson > -- > >