Return-Path: Received: from mtain-dh01.r1000.mx.aol.com (mtain-dh01.r1000.mx.aol.com [172.29.65.21]) by air-ma08.mail.aol.com (v127_r1.1) with ESMTP id MAILINMA082-b5314b82b01fd8; Mon, 22 Feb 2010 11:26:07 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dh01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 86D5E3800011C; Mon, 22 Feb 2010 11:26:01 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Njb5v-0002CM-TE for rs_out_1@blacksheep.org; Mon, 22 Feb 2010 16:25:15 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Njb5v-0002CC-Gz for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 16:25:15 +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 1Njb5s-00031I-V0 for rsgb_lf_group@blacksheep.org; Mon, 22 Feb 2010 16:25:15 +0000 Received: from paranoid.lipkowski.org (localhost [127.0.0.1]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id o1MGPsvE004967 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO) for ; Mon, 22 Feb 2010 17:25:54 +0100 Received: from localhost (sq5bpf@localhost) by paranoid.lipkowski.org (8.13.7/8.13.6/Submit) with ESMTP id o1MGPsEC004964 for ; Mon, 22 Feb 2010 17:25:54 +0100 X-Authentication-Warning: paranoid.lipkowski.org: sq5bpf owned process doing -bs Date: Mon, 22 Feb 2010 17:25:54 +0100 (CET) From: Jacek Lipkowski To: rsgb_lf_group@blacksheep.org In-Reply-To: <38A51B74B884D74083D7950AD0DD85E82A1B04@File-Server-HST.hst.e-technik.tu-darmstadt.de> Message-ID: References: <32098189.1842344.1266827344324.JavaMail.fmail@mwmweb080> <38A51B74B884D74083D7950AD0DD85E82A1B04@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: LF: Re: Beaconing on 8.79 kHz in QRSS 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: G x-aol-sid: 3039ac1d41154b82b01963a4 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) I've done some tests on VLF also, like many others on this group. For antennas i've used a 1.5m x 2.5m 3-turn loop, a 4mx14m 1-turn loop, and coupling to external structures (i won't disscuss this bit here :). Using the third antenna i can receive my vlf beacon abt 750m from here. The power was abt. 2W from a TDA2030: http://acid.ch.pw.edu.pl/~sq5bpf/ham/vlf/20100203/vlfcapt3747.jpg The receiving antenna was a 100turn loop in a hula-hop toy with a dia. of 90cm. This loop was tuned to resonance and amplified. Using the 4x14m loop and abt. 40w from a TDA1562 i can receive it from 930m: http://acid.ch.pw.edu.pl/~sq5bpf/ham/vlf/capt0706082213.jpg The receiving antenna was a 50turn loop in a hula-hop toy with a dia. of 80cm. This loop was connected to the amplifier virtual ground (broadband design like "easyloop"). If i remember correctly i could receive 40W into the 1.5x2.5m 3-turn loop at about 500m. Unfortunately i haven't had an opportunity to play with e-field antennas, which should be much more efficient. I've noted that for b-field antennas nearby installations (power lines, phone lines etc) can carry the vlf signal far away (hint :) VY 73 Jacek / SQ5BPF