Return-Path: Received: (qmail 8690 invoked from network); 5 Feb 2001 22:34:13 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 5 Feb 2001 22:34:13 -0000 Received: (qmail 20245 invoked from network); 5 Feb 2001 22:37:06 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 5 Feb 2001 22:37:06 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14Pu9z-0000sN-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 05 Feb 2001 22:30:59 +0000 Received: from rhenium.btinternet.com ([194.73.73.93] helo=rhenium) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14Pu9w-0000sH-00 for rsgb_lf_group@blacksheep.org; Mon, 05 Feb 2001 22:30:56 +0000 Received: from [213.122.221.226] (helo=default) by rhenium with smtp (Exim 3.03 #83) id 14Pu9h-0002YI-00 for rsgb_lf_group@blacksheep.org; Mon, 05 Feb 2001 22:30:42 +0000 Message-ID: <004401c08fc3$0583eae0$044f073e@default> From: "Alan Melia" To: "LF-Group" Subject: LF: Fluorescent light QRM Date: Mon, 5 Feb 2001 22:27:48 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Hi All, as result of Dick's, comments I went round my 3 lights. One is a 2foot (60cms) 20W , one is a 4 foot (120cms) and one 75 watt circular tube. The 'detector was an AOR 2700 scanner tuned to 137kHz AM, using a 50cms whip. I do not hear any noise from these units on my receiver. The lights are about 10 to 12m from the vertical portion of my wire aerial and 8 to 10m from my loop. I could only detect noise on the 2700 when it was within about 1.5m of the illuminated tube. I do not have any 'dimmers' in the house. The least was radiated by the circular tube. I have heard noise on 136kHz when a tube was failing and showed a significant 'shadow' at one end of the tube. I have also had trouble when a 'starter' was firing continually even whilst the tube was lit. The straight tubes are mounted on a metallic grounded box, the circular tube is hung from a small grounded metallic triangular plate. Even close up this noise ceased when the light was extinguished. Our switching should be in the 'live' side in the UK, I wonder if Dick has a tube switched in the neutral line. I did test an Osram Dulux EL that Christer mentioned, some while back and did not find any problems.....I will look at one of these again! Cheers de Alan G3NYK Alan.Melia@btinternet.com