Return-Path: Received: from rly-da06.mx.aol.com (rly-da06.mail.aol.com [172.19.129.80]) by air-da01.mail.aol.com (v121_r5.5) with ESMTP id MAILINDA012-a7249a086913a7; Sat, 21 Feb 2009 17:56:39 -0500 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-da06.mx.aol.com (v121_r4.4) with ESMTP id MAILRELAYINDA062-a7249a086913a7; Sat, 21 Feb 2009 17:56:19 -0500 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Lb0lQ-0003GK-QL for rs_out_1@blacksheep.org; Sat, 21 Feb 2009 22:56:04 +0000 Received: from [83.244.159.144] (helo=relay3.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Lb0lQ-0003GB-Bi for rsgb_lf_group@blacksheep.org; Sat, 21 Feb 2009 22:56:04 +0000 Received: from imo-d05.mx.aol.com ([205.188.157.37]) by relay3.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Lb0lP-0004cM-18 for rsgb_lf_group@blacksheep.org; Sat, 21 Feb 2009 22:56:04 +0000 Received: from MarkusVester@aol.com by imo-d05.mx.aol.com (mail_out_v39.1.) id l.be4.4d5e42db (37229) for ; Sat, 21 Feb 2009 17:55:49 -0500 (EST) Received: from Silver (g229161014.adsl.alicedsl.de [92.229.161.14]) by cia-ma06.mx.aol.com (v123.3) with ESMTP id MAILCIAMA066-916d49a08674160; Sat, 21 Feb 2009 17:55:49 -0500 Message-ID: <07CAB115732B40F59D87897A3301DDE3@Silver> From: "Markus Vester" To: Date: Sat, 21 Feb 2009 22:55:47 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5512 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Spam-Flag:NO X-Spam-Score: 3.4 (+++) X-Spam-Report: autolearn=disabled,FORGED_MUA_OUTLOOK=3.36,HTML_MESSAGE=0.001 Subject: LF: Luxembourg effect caused by DRM? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0013_01C99477.88C1EF80" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: ** X-Spam-Status: No, hits=2.4 required=5.0 tests=FORGED_MUA_OUTLOOK,HTML_30_40, 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-IP: 193.82.116.20 ------=_NextPart_000_0013_01C99477.88C1EF80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Dear LF, during parts of most nights, the Luxembourg crossmodulation shows a regular=20= banding structure across a wide frequency range, quite unlike the typical pa= tterns of AM music modulation: http://www.alice-dsl.net/df6nm/test0902210320.png The band spacing matches the subcarrier spectrum for "Mode A" DRM digital mo= dulation (204 carriers spaced 41.66 Hz). A likely "heater" candidate would b= e Zehlendorf 177 kHz, which has been reported in DRM mode after midnight - c= ould someone perhaps confirm the times of digital operation? Another "mystery" noise band sometimes appears at night, about 200 Hz wide c= entered on 137.07 kHz, and of easterly origin (red): http://www.alice-dsl.net/df6nm/test0902210100.png In this capture, there is also a weaker replica of this band centered on 137= .19 (north, violet). This combination would suggest Luxembourg effect on bot= h HGA22 (east) and DCF39 (north), caused by a common heater carrying 1.64 kH= z AM modulation. However I have no clue to what the source is, and why it wo= uld carry such an unusual modulation spectrum. Kind regards, Markus, DF6NM ------=_NextPart_000_0013_01C99477.88C1EF80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Dear LF,
 
during parts of most nights, the Luxembourg= =20 crossmodulation shows a regular banding structure across a wide frequency ra= nge,=20 quite unlike the typical patterns of AM music modulation:
The band spacing matches=20 the subcarrier spectrum for "Mode A" DRM digital modulation (204=20 carriers spaced 41.66 Hz). A likely "heater" candidate would be Zehlend= orf=20 177 kHz, which has been reported in DRM mode after midnight - could som= eone=20 perhaps confirm the times of digital operation?
 
Another "mystery" noise band sometimes= appears=20 at night, about 200 Hz wide centered on 137.07 kHz, and of easterly origin=20 (red):
In this capture, there is also a weaker rep= lica of=20 this band centered on 137.19 (north, violet). This combination would=20 suggest Luxembourg effect on both HGA22 (east) and DCF39 (north),=20 caused by a common heater carrying 1.64 kHz AM modulation. However I have no= =20 clue to what the source is, and why it would carry = such=20 an unusual modulation spectrum.
 
Kind=20 regards,
Markus, DF6NM
 
------=_NextPart_000_0013_01C99477.88C1EF80--