Return-Path: Received: (qmail 18211 invoked from network); 6 Jul 2002 12:59:01 -0000 Received: from marstons.services.quay.plus.net (212.159.14.223) by mailstore with SMTP; 6 Jul 2002 12:59:00 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 9824 invoked by uid 10001); 6 Jul 2002 13:02:48 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by marstons.services.quay.plus.net with SMTP; 6 Jul 2002 13:02:47 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 17Qp0I-0006cf-00 for rsgb_lf_group-outgoing@blacksheep.org; Sat, 06 Jul 2002 13:49:34 +0100 Received: from cmailenv2.svr.pol.co.uk ([213.218.77.54]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 17Qp0H-0006ca-00 for rsgb_lf_group@blacksheep.org; Sat, 06 Jul 2002 13:49:33 +0100 Received: from [62.21.151.238] (helo=w8k3f0.freeler.nl) by cmailENV2.svr.pol.co.uk with esmtp (Exim 3.35 #1) id 17Qp0F-0006Aj-00 for rsgb_lf_group@blacksheep.org; Sat, 06 Jul 2002 12:49:31 +0000 Message-ID: <5.1.0.14.0.20020706110149.00a08b40@POP3.freeler.nl> X-Sender: FRE0000086604@POP3.freeler.nl X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Sat, 06 Jul 2002 11:12:35 +0200 To: "LF-Group" From: "Dick Rollema" Subject: LF: Luxemburg effect? MIME-Version: 1.0 Content-Type: text/html; charset=windows-1252 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Content-transfer-encoding: 8bit To All from PA0SE

Already several days I suffer from terrible broadcast QRM on the LF-band. It sounds like Luxemburg effect centered on DC39.
It is so bad that this morning I could hardly read M0BMU on 137.4kHz where I tried to measure his field strength and reporting back with my 1944 Hellschreiber. Jim always has a strong signal, about S8, and the test failed completely due to the BC-QRM.
I experience it on both the Teletron LWF45 LF receiver and the W & G SPM-12 selective level meter I used for the measurement.
The LWF45 has excellent front-end selectivity (5 tuned circuits tracking the local oscillator) so it can't be cross- or intermodulation  by a strong BC-signal.

The only other cause I can think of is some "rusty bolt" effect that has recently developed.

Do others have the same problem?

73, Dick, PA0SE