Return-Path: Received: from mtain-mp05.r1000.mx.aol.com (mtain-mp05.r1000.mx.aol.com [172.29.193.73]) by air-db04.mail.aol.com (v129.4) with ESMTP id MAILINDB041-85f04d15ccc231b; Sat, 25 Dec 2010 05:51:46 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-mp05.r1000.mx.aol.com (Internet Inbound) with ESMTP id 6F22938000047; Sat, 25 Dec 2010 05:51:44 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PWRi2-0007vh-B0 for rs_out_1@blacksheep.org; Sat, 25 Dec 2010 10:50:46 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PWRi1-0007vY-Oo for rsgb_lf_group@blacksheep.org; Sat, 25 Dec 2010 10:50:45 +0000 Received: from imr-da06.mx.aol.com ([205.188.169.203]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PWRhy-0006kJ-IB for rsgb_lf_group@blacksheep.org; Sat, 25 Dec 2010 10:50:45 +0000 Received: from mtaout-mb04.r1000.mx.aol.com (mtaout-mb04.r1000.mx.aol.com [172.29.41.68]) by imr-da06.mx.aol.com (8.14.1/8.14.1) with ESMTP id oBPAoTvw017212 for ; Sat, 25 Dec 2010 05:50:29 -0500 Received: from White (nrbg-4dbe4324.pool.mediaWays.net [77.190.67.36]) by mtaout-mb04.r1000.mx.aol.com (MUA/Third Party Client Interface) with ESMTPA id 3A9D6E00009D for ; Sat, 25 Dec 2010 05:50:23 -0500 (EST) Message-ID: From: "Markus Vester" To: References: <07CAB115732B40F59D87897A3301DDE3@Silver> Date: Sat, 25 Dec 2010 11:50:24 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 12.0.1606 X-MimeOLE: Produced By Microsoft MimeOLE V12.0.1606 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,HTML_MESSAGE=0.001 Subject: Re: LF: Luxembourg effect caused by DRM? Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01CBA429.EA5FEA80" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.6 required=5.0 tests=HTML_40_50,HTML_MESSAGE, MISSING_OUTLOOK_NAME 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: 3039ac1dc1494d15ccbd5203 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : temperror ------=_NextPart_000_0014_01CBA429.EA5FEA80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Picking up an old thread, but perhaps still interesting...=20 The "digital Luxembourg" noise caused by DRM on 177 kHz are visible du= ring many nights from 1.00 to 4:00 UT. Unrelated to this, also the str= ange 1.64 kHz ICM bands are often noticable. I have added two newer sc= reenshots with annotations, and with RDF colours swapped for better vi= sibility: http://df6nm.bplaced.net/LF/ICM-DRM_101221_0110.jpg http://df6nm.bplaced.net/LF/ICM-1640Hz_101225_0245.jpg Best wishes, Markus (DF6NM) From: Markus Vester=20 Sent: Saturday, February 21, 2009 11:55 PM To: rsgb_lf_group@blacksheep.org=20 Subject: LF: Luxembourg effect caused by DRM? Dear LF, during parts of most nights, the Luxembourg crossmodulation shows a re= gular banding structure across a wide frequency range, quite unlike th= e typical patterns of AM music modulation: http://www.alice-dsl.net/df6nm/test0902210320.png The band spacing matches the subcarrier spectrum for "Mode A" DRM digi= tal modulation (204 carriers spaced 41.66 Hz). A likely "heater" candi= date would be Zehlendorf 177 kHz, which has been reported in DRM mode= after midnight - could someone perhaps confirm the times of digital= operation? Another "mystery" noise band sometimes appears at night, about 200 Hz= wide centered 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 both HGA22 (east) and DCF39 (north), caused by a common hea= ter carrying 1.64 kHz AM modulation. However I have no clue to what th= e source is, and why it would carry such an unusual modulation spectru= m. Kind regards, Markus, DF6NM ------=_NextPart_000_0014_01CBA429.EA5FEA80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Picking up an old thread, but perhaps= still=20 interesting... 
 
The "digital Luxembourg" noise caused= by=20 DRM on 177 kHz are visible during many nights from 1.00= to 4:00=20 UT. Unrelated to this, also the strange 1.64 kHz ICM bands= are=20 often noticable. I have added= two newer=20 screenshots with annotations, and with RDF=20 colours swapped for better visibility:
 
 
Best wishes,
Markus (DF6NM)
 

From: Markus Vester
Sent: Saturday, February 21, 2009 11:55 PM
Subject: LF: Luxembourg effect caused by DRM?
<= /DIV>
=
Dear LF,
 
during parts of most nights, the Luxe= mbourg=20 crossmodulation shows a regular banding structure across a wide freque= ncy range,=20 quite unlike the typical patterns of AM music modulation:<= /DIV>
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= Zehlendorf=20 177 kHz, which has been reported in DRM mode after midnight - cou= ld someone=20 perhaps confirm the times of digital operation?
 
Another "mystery" noise band som= etimes appears=20 at night, about 200 Hz wide centered on 137.07 kHz, and of easterly or= igin=20 (red):
In this capture, there is also a weak= er replica of=20 this band centered on 137.19 (north, violet). This combination wo= uld=20 suggest Luxembourg effect on both HGA22 (east) and DCF39 (no= rth),=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.
 
Ki= nd=20 regards,
Markus, DF6NM
 
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