Return-Path: Received: (qmail 8534 invoked from network); 1 Jan 2001 12:12:17 -0000 Received: from unknown (HELO warrior-inbound.servers.plus.net) (212.159.14.227) by extortion.plus.net with SMTP; 1 Jan 2001 12:12:17 -0000 Received: (qmail 12892 invoked from network); 1 Jan 2001 12:14:51 -0000 Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by warrior with SMTP; 1 Jan 2001 12:14:51 -0000 Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14D3m2-0006AG-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 01 Jan 2001 12:09:10 +0000 Received: from mail12.svr.pol.co.uk ([195.92.193.215]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14D3m1-0006AA-00 for rsgb_lf_group@blacksheep.org; Mon, 01 Jan 2001 12:09:10 +0000 Received: from modem-58.lawrencium.dialup.pol.co.uk ([62.136.71.58] helo=default) by mail12.svr.pol.co.uk with smtp (Exim 3.13 #0) id 14D3ls-0001VO-00 for rsgb_lf_group@blacksheep.org; Mon, 01 Jan 2001 12:09:01 +0000 Message-ID: <000e01c073ea$e1eb2740$3a47883e@default> From: "MAL HAMILTON" To: "rsgb" Subject: LF: BIG/SMALL ANTENNAS Date: Sun, 31 Dec 2000 19:19:37 -0000 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 4.72.3110.5 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: Your are all forgetting an important factor. The larger the antenna for the frequency of interest the greater the Radiation Resistance and consequently less losses in other compontents. A small antenna's Radiation Resistance is surpassed by other losses in loading coils etc ie Rr 0.4 ohms, other losses possibly 50 plus ohms, heating up the ground beneath the antenna. A case where theory cannot be implemented in practice. The big antenna is propogating the signal, the small antenna is burning the grass underneath it and acting like a leaky dummy load. G3KEV