Return-Path: Received: (qmail 9406 invoked from network); 29 Jan 2002 16:15:45 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO murphys-inbound.services.quay.plus.net) (212.159.14.225) by exhibition.plus.net with SMTP; 29 Jan 2002 16:15:45 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 3988 invoked from network); 29 Jan 2002 16:15:34 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys.services.quay.plus.net with SMTP; 29 Jan 2002 16:15:34 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16VaoB-0002m0-00 for rsgb_lf_group-outgoing@blacksheep.org; Tue, 29 Jan 2002 16:08:31 +0000 Received: from hestia.herts.ac.uk ([147.197.200.9]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16Vao9-0002lv-00 for rsgb_lf_group@blacksheep.org; Tue, 29 Jan 2002 16:08:30 +0000 Received: from gemini ([147.197.200.44] helo=gemini.herts.ac.uk) by hestia.herts.ac.uk with esmtp (Exim 3.22 #1) id 16VanN-0006Ca-00 for rsgb_lf_group@blacksheep.org; Tue, 29 Jan 2002 16:07:41 +0000 Received: from [147.197.232.252] (helo=rsch-15.herts.ac.uk) by gemini.herts.ac.uk with esmtp (Exim 3.33 #1) id 16VanM-0006qE-00 for rsgb_lf_group@blacksheep.org; Tue, 29 Jan 2002 16:07:40 +0000 Message-ID: <5.1.0.14.0.20020129153852.00b06cd8@gemini.herts.ac.uk> X-Sender: mj9ar@gemini.herts.ac.uk X-Mailer: QUALCOMM Windows Eudora Version 5.1 Date: Tue, 29 Jan 2002 16:05:23 +0000 To: rsgb_lf_group@blacksheep.org From: "James Moritz" Subject: Re: LF: Tesla Coil as an antenna In-reply-to: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: At 09:14 29/01/2002 -0500, you wrote: >Hello, > I have not experimented in a while with my partially built tesla coil, but >has anyone used their Tesla coil as an antenna for ELF or other Freqs? If we >try to use it for 137 KHz how do you determine ERP? Dear Tom, LF group, Well, occasionally I have inadvertently used my LF antenna as a Tesla coil :-) But seriously, The Tesla coil is essentially a helical antenna (see ON7YD's LF antenna web pages http://www.qsl.net/on7yd/136ant.htm ). So if it is several metres tall, and you can persuade it to resonate on 136kHz, it might make a usable LFantenna. Of course, you would want to avoid the discharges that occur in the normal Tesla coil mode of operation, since these generate QRM and absorb lots of RF power. Cheers, Jim Moritz 73 de M0BMU