Return-Path: Received: from mtain-ma05.r1000.mx.aol.com (mtain-ma05.r1000.mx.aol.com [172.29.96.13]) by air-de06.mail.aol.com (v127_r1.1) with ESMTP id MAILINDE064-5eb94b83967f138; Tue, 23 Feb 2010 03:49:03 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-ma05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 4AD7F3800009E; Tue, 23 Feb 2010 03:49:02 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NjqR3-00085w-D2 for rs_out_1@blacksheep.org; Tue, 23 Feb 2010 08:48:05 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NjqR2-00085n-SX for rsgb_lf_group@blacksheep.org; Tue, 23 Feb 2010 08:48:04 +0000 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 1NjqR0-0000mi-39 for rsgb_lf_group@blacksheep.org; Tue, 23 Feb 2010 08:48:04 +0000 Received: from paranoid.lipkowski.org (localhost [127.0.0.1]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id o1N8mhgZ009735 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Tue, 23 Feb 2010 09:48:43 +0100 Received: from localhost (sq5bpf@localhost) by paranoid.lipkowski.org (8.13.7/8.13.6/Submit) with ESMTP id o1N8mhPk009732 for ; Tue, 23 Feb 2010 09:48:43 +0100 X-Authentication-Warning: paranoid.lipkowski.org: sq5bpf owned process doing -bs Date: Tue, 23 Feb 2010 09:48:43 +0100 (CET) From: Jacek Lipkowski To: "rsgb_lf_group@blacksheep.org" In-Reply-To: Message-ID: References: <32098189.1842344.1266827344324.JavaMail.fmail@mwmweb080> <38A51B74B884D74083D7950AD0DD85E82A1B04@File-Server-HST.hst.e-technik.tu-darmstadt.de> ,<38A51B74B884D74083D7950AD0DD85E82A1B06@File-Server-HST.hst.e-technik.tu-darmstadt.de> MIME-Version: 1.0 X-Spam-Score-sq5bpf: -2.601 () 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: VLF_8.79 kHz 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=TO_ADDRESS_EQ_REAL 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: 3039ac1d600d4b83967e083d X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) On Mon, 22 Feb 2010, Rik Strobbe wrote: > I just did a simple test: I took 2 old LW ferrite antennas and brought > them to resonance at 1.5kHz [...] Solid copy in WSPR, over a distance of > 15m. [...] now try to repeat the same test with both antennas outside. you will find that the coupling to wires within your home enhances the signal, this principle is used in mine comminications on lf. you should still be able to span 15m, but the signal should be much weaker. btw, this is one route that you can take to transmit vlf, but coupling your transmitter to big commercial strictures might be illegal (hint :) VY 73 Jacek / SQ5BPF