Return-Path: Received: from rly-db02.mx.aol.com (rly-db02.mail.aol.com [172.19.130.77]) by air-db03.mail.aol.com (v124.15) with ESMTP id MAILINDB033-aaf4a8d5bc2263; Thu, 20 Aug 2009 10:21:05 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-db02.mx.aol.com (v124.15) with ESMTP id MAILRELAYINDB025-aaf4a8d5bc2263; Thu, 20 Aug 2009 10:20:53 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Me8UG-0007LQ-GR for rs_out_1@blacksheep.org; Thu, 20 Aug 2009 15:19:32 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Me8UG-0007LH-39 for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 15:19:32 +0100 Received: from mail.gmx.net ([213.165.64.20]) by relay1.thorcom.net with smtp (Exim 4.63) (envelope-from ) id 1Me8TY-0001ck-3L for rsgb_lf_group@blacksheep.org; Thu, 20 Aug 2009 15:18:48 +0100 Received: (qmail 15506 invoked by uid 0); 20 Aug 2009 14:19:19 -0000 Received: from 85.178.108.187 by www084.gmx.net with HTTP; Thu, 20 Aug 2009 16:19:18 +0200 (CEST) Date: Thu, 20 Aug 2009 16:19:18 +0200 From: "Dennis" In-Reply-To: <4D0A429582694836812C0FB6FDCADEDD@mjusamsung> Message-ID: <20090820141918.53610@gmx.net> MIME-Version: 1.0 References: , <002e01ca2057$32c9a5c0$0900a8c0@AM> <4A8B9246.29046.10FABD@dave.davesergeant.com> <20090819130355.252210@gmx.net> <4D0A429582694836812C0FB6FDCADEDD@mjusamsung> 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: V01U2FsdGVkX1/idN1u/a7izIG38adntqsfot92sZDdytq6CCIjEU NmgizlMxmpmig9dh5sc5UMCx5A+byZ4b8rxw== X-GMX-UID: KS7sLph1a0A7Qb+KSzEzftk/Njh6dE4d X-FuHaFi: 0.5600000000000001 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 > Dennis (DL6NVC) > Please could you try your loop away from the tree. Preferably more than 2 > metres. I have found severe bio-electric(?) noise from trees from 3.5 to > 500MHz.using loops, whips and UHF Yagis. The noise drops to almost zero > if > the tree ambient temperature is below about zero Celsius. > Mike - G3LHZ Hi Mike, this is a really amazing statement! I'm going to investigate this somewhere in the nature, kilometres away from cities and villages! Yes, the tree obviousely will act as a "black body radiator" at (hot sunny day today) >300 Kelvin. But does this matter to 500kHz or shortwave? I don't believe it. But with UHF and SHF weak signal communication, this thermal noise would clearely be an important issue. Since yesterday, I actually have 3 loops up and running: 1. 10m loop, linden tree, nearest end about 5m from the house, abt 15m agl 2. 10m loop on the balcony, outside but close to the house 3. abt. 12m indoor loop I must tell you, that the loop inside the linden tree delivers by far the best signal-to-noise, the balcony-loop is worse, and the indoor loop is even much much worse. The broadband noise seems to travel along the mains wiring. When I simply touch the soldering iron, when I connected the central heating as "ground", this all causes increased noise. Think, some or several of my neighbours are using powerline communication systems. vy73 Dennis DL6NVC -- GRATIS für alle GMX-Mitglieder: Die maxdome Movie-FLAT! Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome01