Return-Path: Received: from mtain-mj11.r1000.mx.aol.com (mtain-mj11.r1000.mail.aol.com [172.21.164.95]) by air-dc02.mail.aol.com (v129.4) with ESMTP id MAILINDC024-86a04c0133f1319; Sat, 29 May 2010 11:34:09 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by mtain-mj11.r1000.mx.aol.com (Internet Inbound) with ESMTP id 62F7238000095; Sat, 29 May 2010 11:34:06 -0400 (EDT) Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1OIO1z-0006SZ-JN for rs_out_1@blacksheep.org; Sat, 29 May 2010 16:32:59 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1OIO1y-0006SQ-RQ for rsgb_lf_group@blacksheep.org; Sat, 29 May 2010 16:32:58 +0100 Received: from out1.ip01ir2.opaltelecom.net ([62.24.128.237]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1OIO1w-0004ch-7h for rsgb_lf_group@blacksheep.org; Sat, 29 May 2010 16:32:58 +0100 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AvkIAMbQAExcEYSa/2dsb2JhbACHXYpYjAVxvVWFFgQ X-IronPort-AV: E=Sophos;i="4.53,323,1272841200"; d="scan'208";a="312404152" Received: from unknown (HELO xphd97xgq27nyf) ([92.17.132.154]) by out1.ip01ir2.opaltelecom.net with SMTP; 29 May 2010 16:32:38 +0100 Message-ID: <001701caff44$2450bb10$0401a8c0@xphd97xgq27nyf> From: "mal hamilton" To: References: <38A51B74B884D74083D7950AD0DD85E82A1C00@File-Server-HST.hst.e-technik.tu-darmstadt.de> , <1344257766.4243506.1275063067203.JavaMail.fmail@mwmweb035> <38A51B74B884D74083D7950AD0DD85E82A1C0D@File-Server-HST.hst.e-technik.tu-darmstadt.de> <4C012CA7.5030004@gmx.com> Date: Sat, 29 May 2010 16:32:26 +0100 MIME-Version: 1.0 X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2600.0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2600.0000 X-Spam-Score: 0.0 (/) X-Spam-Report: autolearn=disabled,none Subject: LF: Re: 8.97kc - TV transformer info needed Content-Type: text/plain; charset="iso-8859-1" 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: 3039400c89b64c0133ee3dcb X-AOL-IP: 193.82.116.20 Mike The core material is usually 3C5 or similar used in old tube TV'S. I have rewound several for both 137 and 500 kcs and they are perfect for the job. These are the larger ones, today they are a lot smaller in transistor tv's. I think Stefan uses one in its original state with the high value Inductor already on the core. They worked around 15 - 20 kcs. So possibly an original with the high inductance would resonate a vlf long wire antenna and wind a few turns on the opposite core side to couple to the TX I hope this helps The ones that I use are square 3 inches long each side and 3/4 inch thick. mal/g3kev ----- Original Message ----- From: "Mike.WE0H" To: Sent: Saturday, May 29, 2010 4:03 PM Subject: LF: 8.97kc - TV transformer info needed > Can someone explain what the TV transformer is and a picture so I can > find one here? I was doing testing last night with a DDS VFO into a > microwave oven power transformer and got the voltage up enough to > radiate a 8kc signal. I would like to try a TV transformer if I could > figure out what it is and what I need to be digging in my junk box for. > > Thank you, > Mike > WE0H >