Return-Path: Received: from mtain-dc05.r1000.mx.aol.com (mtain-dc05.r1000.mx.aol.com [172.29.64.133]) by air-dc01.mail.aol.com (v129.4) with ESMTP id MAILINDC014-869f4d9a06f6218; Mon, 04 Apr 2011 13:59:18 -0400 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by mtain-dc05.r1000.mx.aol.com (Internet Inbound) with ESMTP id F3EDB380008AD; Mon, 4 Apr 2011 13:59:05 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1Q6o1e-0006kF-Ev for rs_out_1@blacksheep.org; Mon, 04 Apr 2011 18:57:18 +0100 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1Q6o1d-0006k0-SO for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2011 18:57:17 +0100 Received: from mtaout02-winn.ispmail.ntl.com ([81.103.221.48]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1Q6o1X-0000fN-Pt for rsgb_lf_group@blacksheep.org; Mon, 04 Apr 2011 18:57:17 +0100 Received: from aamtaout03-winn.ispmail.ntl.com ([81.103.221.35]) by mtaout02-winn.ispmail.ntl.com (InterMail vM.7.08.04.00 201-2186-134-20080326) with ESMTP id <20110404175705.EXIY6199.mtaout02-winn.ispmail.ntl.com@aamtaout03-winn.ispmail.ntl.com> for ; Mon, 4 Apr 2011 18:57:05 +0100 Received: from [192.168.2.2] (really [82.5.252.56]) by aamtaout03-winn.ispmail.ntl.com (InterMail vG.3.00.04.00 201-2196-133-20080908) with ESMTP id <20110404175705.ZCRH28282.aamtaout03-winn.ispmail.ntl.com@[192.168.2.2]> for ; Mon, 4 Apr 2011 18:57:05 +0100 From: "Mike Dennison" To: rsgb_lf_group@blacksheep.org Date: Mon, 04 Apr 2011 18:56:44 +0100 MIME-Version: 1.0 Message-ID: <4D9A146C.25841.206191E@mike.dennison.ntlworld.com> X-mailer: Pegasus Mail for Windows (4.41) Content-description: Mail message body X-Cloudmark-Analysis: v=1.1 cv=R50lirqlHffDPPkwUlkuVa99MrvKdVWo//yz83qex8g= c=1 sm=0 a=yAHza2DAYqAA:10 a=9YlaCzn6_68A:10 a=kj9zAlcOel0A:10 a=kBgt-MmbXPOuLUpVLzoA:9 a=CjuIK1q_8ugA:10 a=HpAAvcLHHh0Zw7uRqdWCyQ==:117 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Decca faulty transformer? 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-global-disposition: G x-aol-sid: 3039ac1d40854d9a06e94406 X-AOL-IP: 195.171.43.25 X-AOL-SPF: domain : blacksheep.org SPF : none I have a fault on my Decca 5501 LF transmitter. It appears that the main output transformer / combiner is faulty. Each Tx module takes current when connected to the transformer, even when the output is disconnected. And there is no power out of the transformer. I have some questions: According to the the circuit diagram, the transformer's output winding has a 3.3nF capacitor across it. However, it seems to be invisible! Does anyone know where it is? Is it inside the pot core? Does anyone have a spare transformer for sale? Has anyone had a similar fault? Is it difficult to disassemble the transformer? It is very difficult to test for shorted turns because the resistance is extremely low. Any ideas? Mike, G3XDV ==========