Return-Path: Received: from mtain-mh10.r1000.mx.aol.com (mtain-mh10.r1000.mx.aol.com [172.29.96.222]) by air-dc08.mail.aol.com (v128.1) with ESMTP id MAILINDC082-862c4bb4cd9e31d; Thu, 01 Apr 2010 12:45:19 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mh10.r1000.mx.aol.com (Internet Inbound) with ESMTP id 5015938003F5C; Thu, 1 Apr 2010 12:43:10 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NxNSq-0008Lx-2s for rs_out_1@blacksheep.org; Thu, 01 Apr 2010 17:41:52 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NxNSp-0008Lo-MZ for rsgb_lf_group@blacksheep.org; Thu, 01 Apr 2010 17:41:51 +0100 Received: from smtp27.orange.fr ([80.12.242.95]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NxNSn-0007rr-Ij for rsgb_lf_group@blacksheep.org; Thu, 01 Apr 2010 17:41:51 +0100 Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf2713.orange.fr (SMTP Server) with ESMTP id 5525B1C0075E for ; Thu, 1 Apr 2010 18:41:43 +0200 (CEST) Received: from me-wanadoo.net (localhost [127.0.0.1]) by mwinf2713.orange.fr (SMTP Server) with ESMTP id 469501C007B0 for ; Thu, 1 Apr 2010 18:41:43 +0200 (CEST) Received: from comcon2.org (AAmiens-156-1-61-236.w90-18.abo.wanadoo.fr [90.18.204.236]) by mwinf2713.orange.fr (SMTP Server) with ESMTP id E14991C0075E for ; Thu, 1 Apr 2010 18:41:42 +0200 (CEST) X-ME-UUID: 20100401164142922.E14991C0075E@mwinf2713.orange.fr Date: Thu, 1 Apr 2010 16:42:40 +0000 (UTC) From: Jean-Pierre Godet X-X-Sender: godetj@comcon2.org To: rsgb_lf_group@blacksheep.org In-Reply-To: <8CC9FBC74256911-41E0-18086@Webmail-m124.sysops.aol.com> Message-ID: References: <8CC9FBC74256911-41E0-18086@Webmail-m124.sysops.aol.com> MIME-Version: 1.0 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: VLF: VK to Eu - both ways! 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: 3039ac1d60de4bb4cd1e34b9 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Dear friends, good evening ! Hello Markus ! On Thu, 1 Apr 2010, Markus Vester wrote: > ... > the Australian VLF transmitter North West Cape (NWC, 19.8 kHz) can be > received regularly in Europe. This morning I had a detailed look on the power spectrum of the MSK signal, and found interesting 21 Hz periodic ripples... >... > I'd be interested to see if others observe this effect as well... > ... No Markus. I'm permanently monitoring this area, more than four years now, and I did not notice this kind of ripple here (north of France). But maybe our aerials are very different ? The 19.8 kHz signal of NWC, naval communication station Harold E. Holt, Australia, as received here, is very clean, as well the 21.4 kHz NPM Lualualei, Hawaii, which is not a too bad DX too I gess. About NWC 19.8 kHz, the signal disappear in the morning, and is coming to live again somewhere in the afternoon, slightly sooner or later according to the season. Just for fun, on last summer, I took advantage of the yearly shutdown of the 19.58 kHz GBZ Anthorn to took a "photo" of the 3-D spectogram of the 18 ==> 24 kHz zoo, that allowed a more beautiful picture of NWC Harold E. Holt. You can have a look on it on the Jean-Pierre Mere / F1AFJ site, thanks to him, which is hosting my VLF data, more exactly on : http://jpmere.online.fr/incoming/f5yg/2009/07/NWC3d.gif You will see NWC just emerging from the noise around 1500 UTC, then gathering strength to rush towards heaven ! The other stations are the more trivial ones haunting this somewhat secluded area, ICV Tavolara Island on 20.27 kHz, GQD Skelton on 22.1 kHz, and, higher, Rosnay (Le Blanc) HWU. > Fascinating stuff! Indeed ! Friendly yours ! J-P f5yg -- Powered by Linux (Slackware 10.0 - kernel 2.4.26)