Return-Path: Received: from mtain-md08.r1000.mx.aol.com (mtain-md08.r1000.mx.aol.com [172.29.96.92]) by air-ma02.mail.aol.com (v129.4) with ESMTP id MAILINMA022-b4f44c2951c43d9; Mon, 28 Jun 2010 21:52:04 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-md08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 3E30D38000121; Mon, 28 Jun 2010 21:51:56 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OTPxw-0000zy-62 for rs_out_1@blacksheep.org; Tue, 29 Jun 2010 02:50:24 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OTPxv-0000zp-Q3 for rsgb_lf_group@blacksheep.org; Tue, 29 Jun 2010 02:50:23 +0100 Received: from mailout-us.gmx.com ([74.208.5.67]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1OTPxu-0003Ys-Vt for rsgb_lf_group@blacksheep.org; Tue, 29 Jun 2010 02:50:23 +0100 Received: (qmail invoked by alias); 29 Jun 2010 01:50:16 -0000 Received: from 75-168-152-6.mpls.qwest.net (EHLO [192.168.1.100]) [75.168.152.6] by mail.gmx.com (mp-us002) with SMTP; 28 Jun 2010 21:50:16 -0400 X-Authenticated: #60769621 X-Provags-ID: V01U2FsdGVkX1/vtwVnF0vvj2a3988wyx6t/0DoGMMWHJMwsRdU85 PpvV81U2BQLI1y Message-ID: <4C295128.4030403@gmx.com> Date: Mon, 28 Jun 2010 20:49:28 -0500 From: Mike-WE0H User-Agent: Thunderbird 2.0.0.24 (X11/20100317) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: In-Reply-To: X-Y-GMX-Trusted: 0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: VLF: Strong drifting carrier on VLF! Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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-sid: 3039ac1d605c4c2951bc6523 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Maybe they were using a untuned Earth Probe antenna? Mike-WE0H Dave-G3WCB wrote: > Dear LF, > > The mystery signal starts at 12 kHz, and sweeps up to 23 kHz over a > period of a few hours, which is nearly an octave. What sort of antenna > system would be in use to allow that sort of frequency coverage? There > must have been a lot of variometer twiddling and tap-changing going on! > > 73, Dave G3WCB IO91RM