Return-Path: Received: (qmail 13764 invoked from network); 18 Feb 2002 09:02:04 -0000 Content-Transfer-Encoding: 8bit Received: from unknown (HELO warrior.services.quay.plus.net) (212.159.14.227) by excalibur-qfe1-smtp-plusnet.harl.plus.net with SMTP; 18 Feb 2002 09:02:04 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 6832 invoked from network); 18 Feb 2002 09:02:03 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior.services.quay.plus.net with SMTP; 18 Feb 2002 09:02:03 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.33 #2) id 16cl7J-0003Js-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 18 Feb 2002 10:33:53 +0000 Received: from mail2.cc.kuleuven.ac.be ([134.58.10.50]) by post.thorcom.com with esmtp (Exim 3.33 #2) id 16cl7I-0003JO-00 for rsgb_lf_group@blacksheep.org; Mon, 18 Feb 2002 10:33:52 +0000 Received: from LCBD15.fys.kuleuven.ac.be (LCBD15.fys.kuleuven.ac.be [134.58.80.15]) by mail2.cc.kuleuven.ac.be (8.12.1/8.12.1) with SMTP id g1I8tL4P242634 for ; Mon, 18 Feb 2002 09:55:21 +0100 Message-ID: <3.0.1.16.20020218095120.2cff7cc2@pb623250.kuleuven.be> X-Sender: pb623250@pb623250.kuleuven.be X-Mailer: Windows Eudora Pro Version 3.0.1 (16) Date: Mon, 18 Feb 2002 09:51:20 To: rsgb_lf_group@blacksheep.org From: "Rik Strobbe" Subject: Re: LF: Re: Re. Vertical grounded tower for LF antenna. In-reply-to: <003c01c1b64f$48182ca0$a86668d5@oemcomputer> References: <000601c1b53a$8f223980$f57b883e@lvm> 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: Hello Mike, I believe that gamma-matching a very short antenna also introduces a practical problem as the feedingpoint impedance will be extremely low (probably some milli-Ohms). Apart from problems with the impedance matching, the current at the feedingpoint will be extemely high. 73, Rik ON7YD At 18:33 15/02/02 -0000, you wrote: >Laurie, G3AQC wrote: >> Mike G3XDV quite correctly pointed out that a gamma match could be used to >> feed a vert. tower. > > >When I thought about this suggestion again, I realised that it would match >the antenna OK, but of course it would not help to resonate it. Gamma >matching is a good way of feeding a grounded resonant Marconi, but it is >still necessary to use top wires to bring the vertical to resonance. Back to >the drawing board . . . > >Mike, G3XDV >=========== > > >