Return-Path: Received: (qmail 30123 invoked from network); 4 Nov 2002 16:59:51 -0000 Received: from warrior.services.quay.plus.net (212.159.14.227) by mailstore with SMTP; 4 Nov 2002 16:59:51 -0000 Received: (qmail 21919 invoked from network); 4 Nov 2002 16:58:50 -0000 Received: from post.thorcom.com (193.82.116.70) by warrior.services.quay.plus.net with SMTP; 4 Nov 2002 16:58:50 -0000 Received: from majordom by post.thorcom.com with local (Exim 4.10) id 188kXK-0005IS-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 04 Nov 2002 16:57:14 +0000 Received: from [206.173.118.93] (helo=uhura.concentric.net) by post.thorcom.com with esmtp (Exim 4.10) id 188kXJ-0005IJ-00 for rsgb_lf_group@blacksheep.org; Mon, 04 Nov 2002 16:57:13 +0000 Received: from cliff.concentric.net (cliff.concentric.net [206.173.118.90]) by uhura.concentric.net [Concentric SMTP Routing 1.0] id gA4GvAh11781 for ; Mon, 4 Nov 2002 11:57:11 -0500 (EST) Received: from jka ([208.37.242.34]) by cliff.concentric.net (8.9.1a) id LAA29295; Mon, 4 Nov 2002 11:57:09 -0500 (EST) Message-ID: <005501c28423$616ab4a0$09dc9384@jka> From: "John Andrews" To: rsgb_lf_group@blacksheep.org References: <5.1.0.14.0.20021104143711.00a8f908@gemini.herts.ac.uk> Date: Mon, 4 Nov 2002 11:58:19 -0500 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 V6.00.2800.1106 Subject: Re: LF: VS: Feeding an inverted L-antenna Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, hits=-0.3 required=5.0tests=QUOTED_EMAIL_TEXT,REFERENCES,SPAM_PHRASE_00_01, USER_AGENT_OEversion=2.42 Sender: Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group > >Wonder why seems to be a habit use a series coil to tune out the > >capacitance of the 136kHz aerial, instead of more normal sort of matching > >- using T- or L-network Actually, using an inductor to ground, with a tap for the feed point, IS a high-pass L network. The portion below the tap represents inductive reactance, and the part above is capacitive (the inductive reactance of the coil is set lower than the capacitive reactance of the antenna). John Andrews, W1TAG