Return-Path: Received: (qmail 8298 invoked from network); 4 Dec 2002 03:38:07 -0000 Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 4 Dec 2002 03:38:07 -0000 Received: (qmail 5507 invoked from network); 4 Dec 2002 03:37:56 -0000 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 4 Dec 2002 03:37:56 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18JQIC-0003Qi-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 04 Dec 2002 03:33:44 +0000 Received: from [216.93.66.203] (helo=mail4.mx.voyager.net) by post.thorcom.com with esmtp (Exim 4.10) id 18JQIB-0003QZ-00 for rsgb_lf_group@blacksheep.org; Wed, 04 Dec 2002 03:33:43 +0000 Received: from k6500 (d33.as1.mpls0.mn.voyager.net [169.207.102.161]) by mail4.mx.voyager.net (8.11.6/8.10.2) with SMTP id gB43XdN53032 for ; Tue, 3 Dec 2002 22:33:40 -0500 (EST) From: "WE0H" To: rsgb_lf_group@blacksheep.org Date: Tue, 3 Dec 2002 21:34:16 -0600 Message-ID: MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2911.0) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Importance: Normal In-reply-to: <006701c29aef$54db13a0$1700a8c0@home> Subject: LF: RE: Flaming aerials! Content-Type: text/html; charset=windows-1252 X-Spam-Status: No, hits=1.4 required=5.0tests=BIG_FONT,HTML_70_90,HTML_FONT_COLOR_BLUE, HTML_FONT_COLOR_NAME,IN_REP_TO,SPAM_PHRASE_01_02, USER_AGENT_OUTLOOKversion=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Content-transfer-encoding: 8bit

Hey Dave,

I thought high current loops were the antennas to start fires??? Nice picture.

 

Mike>WE0H

http://www.we0h.us/lf.html

 

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Dave Pick
Sent: Tuesday, December 03, 2002 11:14 AM
To: LF Group
Subject: LF: Flaming aerials!

 

Dear all, especially Peter.

 

I had a bit of a problem on 73k today, the TX started tripping during my QSO with G3LDO at about 12:30. Eventually I had to reduce the power to a few hundred Watts to sign off.

I went outside, down the full length of the garden to the ATU to see if anything was wrong. All seemed well but I could hear a "crackling" noise and couldn't figure out where it was coming from. I eventually looked up at the top of the tree where the aerial passed over a perspex "Y" on the top of the pole... It was alight! A couple of years worth of polution must have made it conductive enough for the RF to arc through it to the metal supporting pole (which is earthed). I watched it with trepidation lest any burning pieces should drop off and set light to the tree, luckily this didn't happen and eventually it went out.

I have since replaced the top piece with a new design, let's see how long that lasts!

This sort of thing always happens when I "fire-up" on 73k, the Voltages are just so high..

You can just see the flames on this picture.

 

http://www.wireless.org.uk/images/firesky2.jpg

 

73.

Dave

G3YXM.

 

This message scanned for viruses by Corecomm