Return-Path: Received: from mtain-dj01.r1000.mx.aol.com (mtain-dj01.r1000.mail.aol.com [172.19.187.137]) by air-da09.mail.aol.com (v129.4) with ESMTP id MAILINDA091-85eb4ce0e5b1163; Mon, 15 Nov 2010 02:48:01 -0500 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dj01.r1000.mx.aol.com (Internet Inbound) with ESMTP id 2DB55380000A7; Mon, 15 Nov 2010 02:47:59 -0500 (EST) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1PHtlk-0007Cn-N7 for rs_out_1@blacksheep.org; Mon, 15 Nov 2010 07:46:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1PHtlk-0007Ce-CY for rsgb_lf_group@blacksheep.org; Mon, 15 Nov 2010 07:46:28 +0000 Received: from thsbbfxrt01p.thalesgroup.com ([192.54.144.131]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1PHtli-0000Ej-JG for rsgb_lf_group@blacksheep.org; Mon, 15 Nov 2010 07:46:28 +0000 Received: from thsbbfxrt01p.thalesgroup.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 9F23A59A0CE for ; Mon, 15 Nov 2010 08:46:20 +0100 (CET) Message-ID: <21980_1289807180_4CE0E54C_21980_118089_1_92F6B0CB5F307544B1F54305F95265AB8D4ECE@API.clb.tcfr.thales> From: Jean-Louis.RAULT@fr.thalesgroup.com To: rsgb_lf_group@blacksheep.org Date: Mon, 15 Nov 2010 08:46:18 +0100 MIME-Version: 1.0 X-Mailer: Internet Mail Service (5.5.2653.19) X-Spam-Score: 1.7 (+) X-Spam-Report: autolearn=disabled,FORGED_MUA_IMS=1.198,NO_REAL_NAME=0.55 Subject: LF: RE: QRM analysis Content-Type: text/plain X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.4 required=5.0 tests=FORGED_MUA_IMS,NO_REAL_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: 3039cdbc9d054ce0e5af776d X-AOL-IP: 195.171.43.25 John Your QRM looks exactly as the one I get when I use a "lower power consumption" PHILIPS light. There is some kind of chopper inside the socket radiating such wide band noises. Jean-Louis F6AGR > -----Original Message----- > From: owner-rsgb_lf_group@blacksheep.org > [mailto:owner-rsgb_lf_group@blacksheep.org] On Behalf Of John RABSON > Sent: Saturday, November 13, 2010 8:53 PM > To: rsgb_lf_group@blacksheep.org > Subject: LF: QRM analysis > > Please see attached screen print taken with Argo at 2010 Nov > 13 1941z. The frequency marks across the top are relative to > 136.0 kHz approx. The vertical bar is an artefact of the RX. > > The signal can occur at any time and drifts across the RX > passband, with occasional jumps of a few hundred Hz. > > What software would people suggest for analysing it with a > view to determing its cause and perhaps locating it? > > F5VLF > >