Return-Path: <majordom@post.thorcom.com> Received: (qmail 27020 invoked from network); 21 Jun 2000 08:49:21 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by 10.226.25.101 with SMTP; 21 Jun 2000 08:49:21 -0000 Content-Transfer-Encoding: 8bit Received: from majordom by post.thorcom.com with local (Exim 3.02 #1) id 134g52-0000wj-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 21 Jun 2000 09:41:52 +0100 Received: from mail.cc.kuleuven.ac.be ([134.58.10.6]) by post.thorcom.com with esmtp (Exim 3.02 #1) id 134g51-0000we-00 for rsgb_lf_group@blacksheep.org; Wed, 21 Jun 2000 09:41:51 +0100 X-Priority: 3 X-MSMail-Priority: Normal Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail.cc.kuleuven.ac.be (8.9.3/8.9.0) with SMTP id KAA38362 for <rsgb_lf_group@blacksheep.org>; Wed, 21 Jun 2000 10:41:49 +0200 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Message-ID: <3.0.1.16.20000621103659.0af713fc@mail.cc.kuleuven.ac.be> X-Sender: pb623250@mail.cc.kuleuven.ac.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Wed, 21 Jun 2000 10:36:59 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be> Subject: Re: LF: CFA Antenna: miraculous? In-reply-to: <394F7643.7AC83ACF@club-internet.fr> 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: <majordom@post.thorcom.com> I have been looking for information on the CFA antenna and found some on internet. Links to them are found on my webpage : http://www.qsl.net/on7yd/136lit.htm (3 last articles) Who would not be interested in a compact antenna with the performance of a quarter-wave ? Most of us would even be more than happy to accept a loss of 20dB referred to a quarter-wave ... but : - If you convert 6.5m on 16Mhz to 136kHz, the antenna is still 55m high - Building (and adjusting) the antenna will be far more complicated and expensive than making a simple vertical or loop antenna. -So far I have not found any report that a CFA antenna has been built by a ham for any frequency. - While other antennas for 136kHz mainly consist of wires and are rather invisible, the CFA seems to be a massive construction, so a height of 5 to 10 meters will be the limit that most hams can achieve without getting into trouble with the neighbourgs and the authorities. Converted back to 1.16MHz this would mean a height of 1 meter or less. It might be a good idea to try it on topband or even on 80m, let's see what it is worth there. 73, Rik ON7YD