Return-Path: Received: (qmail 23908 invoked from network); 18 Sep 2002 12:07:25 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from murphys.services.quay.plus.net (212.159.14.225) by mailstore with SMTP; 18 Sep 2002 12:07:25 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: (qmail 21747 invoked from network); 18 Sep 2002 12:07:12 -0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from post.thorcom.com (193.82.116.70) by murphys.services.quay.plus.net with SMTP; 18 Sep 2002 12:07:12 -0000 X-SQ: A Received: from majordom by post.thorcom.com with local (Exim 4.10) id 17rdZm-0003EF-00 for rsgb_lf_group-outgoing@blacksheep.org; Wed, 18 Sep 2002 13:05:02 +0100 Received: from [194.217.242.85] (helo=anchor-post-35.mail.demon.net) by post.thorcom.com with esmtp (Exim 4.10) id 17rdZl-0003E5-00 for rsgb_lf_group@blacksheep.org; Wed, 18 Sep 2002 13:05:01 +0100 Received: from telemetry.demon.co.uk ([194.222.19.114]) by anchor-post-35.mail.demon.net with esmtp (Exim 3.36 #2) id 17rdZf-0001SY-0U for rsgb_lf_group@blacksheep.org; Wed, 18 Sep 2002 13:04:56 +0100 Message-ID: Date: Wed, 18 Sep 2002 11:18:08 +0100 To: rsgb_lf_group@blacksheep.org From: "Tom Boucher" In-reply-to: <000e01c25ef4$877024e0$636868d5@oemcomputer> MIME-Version: 1.0 X-Mailer: Turnpike Version 3.03a Subject: Re: LF: Capacity hat puzzle X-Spam-Status: No, hits=-3.4 required=5.0tests=IN_REP_TOversion=2.31 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Mike I reckon that the capacitance of each wire is now in series instead of in parallel, hence lower capacitance and higher resonant frequency. 73, Tom G3OLB >Whilst the mast was down I modified the capacity hat. There are three 17m >long parallel wires, about 0.5 metres apart (total span 1m). The wires are >joined at both ends. (See http://www.lf.thersgb.net/antenna.htm for a >picture). > >I changed this so that the wires were only joined at the far end. Now the >vertical wire and the elevated coil are connected to the centre wire only. >The RF travels along this centre wire to the end, then back using the outer >two wires in parallel.. > >I expected this to increase the inductance of the antenna and so lower its >resonant frequency. The actual effect was the opposite - the frequency >increased and I had to add inductance at the base of the vertical.