Return-Path: Received: from rly-mg10.mx.aol.com (rly-mg10.mail.aol.com [172.20.83.116]) by air-mg10.mail.aol.com (v124.15) with ESMTP id MAILINMG101-a374a8d664dbb; Thu, 20 Aug 2009 11:05:57 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mg10.mx.aol.com (v124.15) with ESMTP id MAILRELAYINMG101-a374a8d664dbb; Thu, 20 Aug 2009 11:05:52 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Me9CB-0007de-Rx for rs_out_1@blacksheep.org; Thu, 20 Aug 2009 16:04:55 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Me9CB-0007dV-Cu for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 16:04:55 +0100 Received: from mail.gmx.net ([213.165.64.20]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1Me9BQ-0001vr-0U for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 16:04:12 +0100 Received: (qmail 3049 invoked by uid 0); 20 Aug 2009 15:04:39 -0000 Received: from 85.178.108.187 by www045.gmx.net with HTTP; Thu, 20 Aug 2009 17:04:37 +0200 (CEST) Date: Thu, 20 Aug 2009 17:04:37 +0200 From: "Dennis" In-Reply-To: <4A8D626A.10122.200EDD0@dave.davesergeant.com> Message-ID: <20090820150437.322210@gmx.net> MIME-Version: 1.0 References: , <4D0A429582694836812C0FB6FDCADEDD@mjusamsung>, <20090820141918.53610@gmx.net> <4A8D626A.10122.200EDD0@dave.davesergeant.com> To: rsgb_lf_group@blacksheep.org X-Authenticated: #4122078 X-Flags: 0001 X-Mailer: WWW-Mail 6100 (Global Message Exchange) X-Priority: 3 X-Provags-ID: V01U2FsdGVkX19ZjIECaPVZhOriLDFRQYd7GopMVs28LRCAGr+yMB buChuHrGd4hM4LnNPTSxEESkv2GIu1NxcHKg== X-GMX-UID: N1+1f+EObmwoQayXVjdLiUxPUzc4chEj X-FuHaFi: 0.59 X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Content-Type: text/plain; charset="iso-8859-1" Subject: Re: LF: Re: Tree noise Content-Transfer-Encoding: 8bit X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: X-Spam-Status: No, hits=0.0 required=5.0 tests=none 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 Hi Dave! > However bad a system Powerline is, it does NOT generate noise at > 500kHz. It occupies 2-28MHz more or less with most of the devices > having very deep notches in the amateur bands. Did not know that, thanks! > > Wideband QRM like yours is far more likely to be switch mode psus (eg > unfiltered PC supplies) or low energy lightbulbs. Yes, one single noise source I was able to track down was the energy saving bulb of my neighbours bedroom. Another source is my own Nokia cellphone charger :( But there is much much more out there. I think it might be "something digital", thought it might be PLC, because sometimes the noise drops and increases rhythmically, like a multiway data transmission, somehow resembling a well used Packet Radio qrg. vy73 Dennis DL6NVC -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01