Return-Path: Received: (qmail 1571 invoked from network); 13 Dec 2002 17:16:39 -0000 Received: from netmail02.services.quay.plus.net (212.159.14.221) by mailstore with SMTP; 13 Dec 2002 17:16:39 -0000 Received: (qmail 24824 invoked by uid 10001); 13 Dec 2002 17:16:17 -0000 Received: from post.thorcom.com (193.82.116.70) by netmail02.services.quay.plus.net with SMTP; 13 Dec 2002 17:16:17 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 18MtPF-0001ae-00 for rsgb_lf_group-outgoing@blacksheep.org; Fri, 13 Dec 2002 17:15:21 +0000 Received: from [62.253.162.42] (helo=mta02-svc.ntlworld.com) by post.thorcom.com with esmtp (Exim 4.10) id 18MtPF-0001aV-00 for rsgb_lf_group@blacksheep.org; Fri, 13 Dec 2002 17:15:21 +0000 Received: from oemcomputer ([80.4.106.77]) by mta02-svc.ntlworld.com (InterMail vM.4.01.03.27 201-229-121-127-20010626) with SMTP id <20021213171520.QOXC14589.mta02-svc.ntlworld.com@oemcomputer> for ; Fri, 13 Dec 2002 17:15:20 +0000 Message-ID: <002501c2a2cb$5b01ca60$4d6a0450@oemcomputer> From: "Mike Dennison" To: rsgb_lf_group@blacksheep.org Date: Fri, 13 Dec 2002 17:16:19 -0000 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4133.2400 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Subject: LF: Back on 73 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=1.0 required=5.0tests=SPAM_PHRASE_00_01,USER_AGENT_OEversion=2.42 X-Spam-Level: * Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group After careful examination, I have found my 73kHz fault. It was not the Tx FETs, but an insulation breakdown in the wire that takes the RF through the house wall. It is well insulated and goes through plastic conduit, but testing it with the 136kHz Tx in the dark produced a warm glow at the end of the piping and a hissing noise. The insulation on the wire had broken down - probably the gradual deterioration caused by corona on 73kHz - and the plastic conduit was not man enough for the job. It must have caused a complete short circuit with the higher voltages on 73k. I think I will have to try my local car spares dealer to see if I can buy some ignition wire. I am now available for skeds or test transmissions on 73kHz is anyone wants one. Mike, G3XDV http://www.lf.thersgb.net =================