Return-Path: Received: from mtain-dg07.r1000.mx.aol.com (mtain-dg07.r1000.mx.aol.com [172.29.65.15]) by air-ma04.mail.aol.com (v127_r1.1) with ESMTP id MAILINMA041-b5144b8d019c2a; Tue, 02 Mar 2010 07:16:28 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-dg07.r1000.mx.aol.com (Internet Inbound) with ESMTP id 291BD380000AA; Tue, 2 Mar 2010 07:16:27 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1NmR0f-00038z-1k for rs_out_1@blacksheep.org; Tue, 02 Mar 2010 12:15:33 +0000 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1NmR0e-00038q-Mm for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 12:15:32 +0000 Received: from parrot.netcom.co.uk ([217.72.171.49]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1NmR0b-0006bV-Vf for rsgb_lf_group@blacksheep.org; Tue, 02 Mar 2010 12:15:32 +0000 Received: from abelian.netcom.co.uk (i-194-106-52-83.freedom2surf.net [194.106.52.83]) by parrot.netcom.co.uk (Postfix) with ESMTP id 1ACBD3278AC for ; Tue, 2 Mar 2010 12:13:08 +0000 (GMT) Received: from [127.0.0.1] (localhost [127.0.0.1]) by abelian.netcom.co.uk (8.13.1/8.13.1) with ESMTP id o22CFNlC015767 for ; Tue, 2 Mar 2010 12:15:24 GMT Message-ID: <4B8D015B.10205@abelian.org> Date: Tue, 02 Mar 2010 12:15:23 +0000 From: Paul Nicholson User-Agent: Thunderbird 2.0.0.14 (X11/20080421) MIME-Version: 1.0 To: rsgb_lf_group@blacksheep.org References: <4B8CE312.7090904@abelian.org> <20100302110052.BFCD8F3864@smtps02.kuleuven.be> In-Reply-To: <20100302110052.BFCD8F3864@smtps02.kuleuven.be> X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: Re: LF: Re: 9kHz noise level Content-Type: text/plain; charset=ISO-8859-1; 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=0.9 required=5.0 tests=FROM_ENDS_IN_NUMS 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: 3039ac1d410f4b8d019b0884 X-AOL-IP: 193.82.116.20 X-Mailer: Unknown (No Version) Rik Strobbe wrote: > Are the 3 red peaks between 10 and 15 kHz from the Russian > Alpha navaid system ? Yes, they're from the RSDN-20 'Alpha' system. 11.904761 kHz, 12.648809 kHz, and 14.880952 kHz. These signals are quite strong and the first two are useful for frequency calibration. More info available here, http://www.vlf.it/alphatrond/alpha.htm -- Paul Nicholson http://abelian.org/vlf --