Return-Path: Received: from mtain-ma08.r1000.mx.aol.com (mtain-ma08.r1000.mx.aol.com [172.29.96.16]) by air-df05.mail.aol.com (v129.4) with ESMTP id MAILINDF052-5ef34bfc41ad209; Tue, 25 May 2010 17:31:25 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma08.r1000.mx.aol.com (Internet Inbound) with ESMTP id ED7433800020E; Tue, 25 May 2010 17:31:23 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OH1hb-0007oU-G7 for rs_out_1@blacksheep.org; Tue, 25 May 2010 22:30:19 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OH1ha-0007oL-Ux for rsgb_lf_group@blacksheep.org; Tue, 25 May 2010 22:30:18 +0100 Received: from 113-mo2-8.acn.waw.pl ([62.121.95.113] helo=paranoid.lipkowski.org) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OH1hY-0006cl-E7 for rsgb_lf_group@blacksheep.org; Tue, 25 May 2010 22:30:18 +0100 Received: from paranoid.lipkowski.org (localhost [127.0.0.1]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id o4PLUFVD011827 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 25 May 2010 23:30:15 +0200 Received: from localhost (sq5bpf@localhost) by paranoid.lipkowski.org (8.13.7/8.13.6/Submit) with ESMTP id o4PLUFuJ011824 for ; Tue, 25 May 2010 23:30:15 +0200 X-Authentication-Warning: paranoid.lipkowski.org: sq5bpf owned process doing -bs Date: Tue, 25 May 2010 23:30:15 +0200 (CEST) From: Jacek Lipkowski To: rsgb_lf_group@blacksheep.org In-Reply-To: Message-ID: References: <38A51B74B884D74083D7950AD0DD85E82A1C00@File-Server-HST.hst.e-technik.tu-darmstadt.de> MIME-Version: 1.0 X-Spam-Score-sq5bpf: -2.558 () AWL,BAYES_00,SPF_HELO_PASS,SPF_PASS X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: AW: 8.97kHz - Near field and radiated signals? Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed 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: S x-aol-sid: 3039ac1d60104bfc41ab3e40 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) On Mon, 24 May 2010, Roger Lapthorn wrote: > - The best DX targets are quite modest: I would like to exceed 1km > initially with the TX power I currently have (around 4W). If I could reach > G6ALB in the next village 3kms away I would be delighted. If I got any > further I would be both amazed and VERY happy! Roger - try an e-field antenna. for a few years i have been doing tests with loops, and the results were not that good. the best distance was about 700m in the city during wintertime with about 40W. i wish i had tried an e-field antenna earlier. the first results with a 40m horizontal wire abt 15m up were far better. i got 1.3 km without problems using about 3W in april (so more qrm than in winter): http://acid.ch.pw.edu.pl/~sq5bpf/ham/vlf/sq5bpf_vlf_test_20100406.jpg the matching was done via a tv transformer, which i see is getting quite popular now :) since you're in a village area you will probably have much less qrm. 3km in the winter seems to be a realistic goal. vy 73 Jacek / SQ5BPF