Return-Path: Received: from rly-mb01.mx.aol.com (rly-mb01.mail.aol.com [172.21.131.154]) by air-mb02.mail.aol.com (v124.15) with ESMTP id MAILINMB022-ce64a8d62ae216; Thu, 20 Aug 2009 10:50:34 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-mb01.mx.aol.com (v124.15) with ESMTP id MAILRELAYINMB012-ce64a8d62ae216; Thu, 20 Aug 2009 10:50:27 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Me8xF-0007Vf-0A for rs_out_1@blacksheep.org; Thu, 20 Aug 2009 15:49:29 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Me8xE-0007VW-F5 for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 15:49:28 +0100 Received: from moutng.kundenserver.de ([212.227.17.9]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Me8wW-0001pE-Cs for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 15:48:45 +0100 Received: from [192.168.1.64] (host86-177-27-138.range86-177.btcentralplus.com [86.177.27.138]) by mrelayeu.kundenserver.de (node=mrbap1) with ESMTP (Nemesis) id 0MKt2u-1Me8x02JER-000Sq4; Thu, 20 Aug 2009 16:49:15 +0200 From: "Dave Sergeant" To: rsgb_lf_group@blacksheep.org Date: Thu, 20 Aug 2009 15:49:14 +0100 MIME-Version: 1.0 Message-ID: <4A8D626A.10122.200EDD0@dave.davesergeant.com> In-reply-to: <20090820141918.53610@gmx.net> References: , <4D0A429582694836812C0FB6FDCADEDD@mjusamsung>, <20090820141918.53610@gmx.net> X-mailer: Pegasus Mail for Windows (4.51) Content-description: Mail message body X-Provags-ID: V01U2FsdGVkX183/45l8a+lntc+EaeRrBNz3gkrErXDAdg8ofI Ot/CUULVj0olLLo2FX803LVKdlVRmaFtsa2Upv9osGgvHYZqXd NKOIdvj7vZnhjhowxhvan+kuOCQXBME X-Karma: unknown: X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: Tree noise Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7BIT 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 On 20 Aug 2009 at 16:19, Dennis wrote: > Think, some or several of my neighbours are using powerline > communication systems. 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. Wideband QRM like yours is far more likely to be switch mode psus (eg unfiltered PC supplies) or low energy lightbulbs. 73 Dave G3YMC http://www.davesergeant.com