Return-Path: Received: from mtain-me08.r1000.mx.aol.com (mtain-me08.r1000.mx.aol.com [172.29.96.144]) by air-dc04.mail.aol.com (v129.4) with ESMTP id MAILINDC044-86a24d22e9d51d4; Tue, 04 Jan 2011 04:35:17 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-me08.r1000.mx.aol.com (Internet Inbound) with ESMTP id 7EDF53800009E; Tue, 4 Jan 2011 04:35:15 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Pa3Hh-0003f5-Gv for rs_out_1@blacksheep.org; Tue, 04 Jan 2011 09:34:29 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Pa3Hh-0003ew-0B for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2011 09:34:29 +0000 Received: from filter02.i-online.fr ([195.200.78.9]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Pa3Hf-0002j8-A2 for rsgb_lf_group@blacksheep.org; Tue, 04 Jan 2011 09:34:28 +0000 Received: from smtp.qtxt.dns-iol.com ([195.200.78.13]) by filter02.i-online.fr (IceWarp 10.0.7 (2010-02-10)) with ESMTP (SSL) id NKL87258 for ; Tue, 04 Jan 2011 10:33:58 +0100 Received: (qmail 31955 invoked by uid 507); 4 Jan 2011 10:34:15 +0100 Received: from unknown (HELO ?192.168.1.103?) (john.rabson@numeo.fr@217.67.155.178) by smtp.qtxt.dns-iol.com with SMTP; 4 Jan 2011 10:34:15 +0100 Mime-Version: 1.0 (Apple Message framework v1082) From: John Rabson X-Priority: 3 In-Reply-To: <1E6E217DE1914FEEB537C3126F277ADE@PCFausto> Date: Tue, 4 Jan 2011 10:34:19 +0100 Message-Id: <27E892F4-A535-4FA0-9040-14ED2443BB40@numeo.fr> References: <1E6E217DE1914FEEB537C3126F277ADE@PCFausto> To: rsgb_lf_group@blacksheep.org X-Mailer: Apple Mail (2.1082) X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Luxembourg effect Content-Type: multipart/alternative; boundary=Apple-Mail-6-146363129 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.5 required=5.0 tests=HTML_40_50,HTML_MESSAGE 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: 3039ac1d60904d22e9d307d5 X-AOL-IP: 195.171.43.25 --Apple-Mail-6-146363129 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Fausto, I believe the Luxembourg effect is a form of cross-modulation occurring in= the ionosphere when there is a high power transmitting station somewhere= on the path between the receiving and transmitting stations, but the sign= al from the interfering station is not strong enough to overload the recei= ver. Could one of our propagation experts provide a more detailed explanation= please? 73 John F5VLF On 3 Jan 2011, at 15:59CET, Fausto Coletti wrote: > Is this a Luxembourg effect ? > First 40 sec i listen at 137 KHz, after i tune at 153 KHz on the origina= l transmission. > RX is a Perseus SDR with a 200 KHz low pass filter at the input for elim= inate MF overload. > The word "trial" every tot second is because i have install a trial vers= ion of VAC software. > =20 > Fausto IK4NMF --Apple-Mail-6-146363129 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii Fausto,

I believe the Luxembourg effect is a form= of cross-modulation occurring in the ionosphere when there is a high powe= r transmitting station somewhere on the path between the receiving and tra= nsmitting stations, but the signal from the interfering station is not str= ong enough to overload the receiver.

Could one of= our propagation experts provide a more detailed explanation please?
=

73
John F5VLF

On 3= Jan 2011, at 15:59CET, Fausto Coletti wrote:

Is this a Luxembourg effect ?
First 40 sec i listen at 137 KHz, after= i tune at 153 KHz on the original transmission.
RX is a Perseus SDR with a 200 KHz low pass filter= at the input for eliminate MF overload.
The word "trial" every tot second is because i have instal= l a trial version of VAC software.
 
Fausto= IK4NMF

=3D --Apple-Mail-6-146363129--