Return-Path: Received: from mtain-da06.r1000.mx.aol.com (mtain-da06.r1000.mx.aol.com [172.29.64.78]) by air-mb06.mail.aol.com (v129.4) with ESMTP id MAILINMB064-a77f4c4f087c26; Tue, 27 Jul 2010 12:25:32 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-da06.r1000.mx.aol.com (Internet Inbound) with ESMTP id 29C8C38000153; Tue, 27 Jul 2010 12:25:31 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Odmwj-0000f5-Ij for rs_out_1@blacksheep.org; Tue, 27 Jul 2010 17:24:01 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Odmwj-0000ew-57 for rsgb_lf_group@blacksheep.org; Tue, 27 Jul 2010 17:24:01 +0100 Received: from smtp.qtxt.dns-iol.com ([195.200.78.13]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Odmwi-0006IY-FN for rsgb_lf_group@blacksheep.org; Tue, 27 Jul 2010 17:24:01 +0100 Received: (qmail 25272 invoked by uid 507); 27 Jul 2010 18:23:27 +0200 Received: from unknown (HELO ?192.168.1.101?) (john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 27 Jul 2010 18:23:27 +0200 Mime-Version: 1.0 (Apple Message framework v1081) From: John Rabson In-Reply-To: <4C4EFB49.3050409@iup.uni-heidelberg.de> Date: Tue, 27 Jul 2010 18:27:27 +0200 Message-Id: <9FD99A5C-6FED-4B55-9495-76181BFE8BDF@numeo.fr> References: <4C4EFB49.3050409@iup.uni-heidelberg.de> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1081) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset=iso-8859-1 Subject: Re: LF: David Gibson on Earth antennas and propagation below 9 kHz Content-Transfer-Encoding: quoted-printable 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: 3039ac1d404e4c4f087b30d6 X-AOL-IP: 193.82.116.20 X-AOL-SPF: domain : blacksheep.org SPF : none I envisage a dipole about 30 m long and about six or 8 m above the ground,= this being what I can conveniently fit behind the shack. I intend to meas= ure the R and X series components at a range of frequencies down (I hope)= to 100 kHz. The feeder will probably be 10 or 20 m of open wire line. The next stage will be to try a folded dipole with and without an open cir= cuit opposite the feed point. In the light of the results I may try variou= s impedances in place of the open/structural circuit. All this will be a follow on from my principle experiment, which is to mea= sure the effect of running my LF end fed antenna directly away from the ho= use instead of parallel to it. I hope this will give a marked reduction in= environmental loss. 73 John F5VLF On 27 Jul 2010, at 17:29CEST, Stefan Sch=E4fer wrote: > YES! Very fine John! What do you plan? Which QRG and which wire length?= My hint is to use a mountain if you have one beside your QTH. > Whish fun and good luck and await your results/report! >=20 > 73, Stefan >=20 > Am 27.07.2010 16:53, schrieb John Rabson: >>=20 >> Andy, >>=20 >> I hope to be doing some aerial experiments (yes - above ground not bel= ow) in the next few weeks and will see if I can put something up and do so= me measurements. >>=20 >> 73 >> John F5VLF