Return-Path: Received: (qmail 29306 invoked from network); 1 Jan 2001 15:56:14 -0000 Received: from unknown (HELO murphys-inbound.servers.plus.net) (212.159.14.225) by extortion.plus.net with SMTP; 1 Jan 2001 15:56:14 -0000 Received: (qmail 2155 invoked from network); 1 Jan 2001 15:58:48 -0000 Content-Type: text/plain; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8bit Received: from unknown (HELO post.thorcom.com) (212.172.148.70) by murphys with SMTP; 1 Jan 2001 15:58:48 -0000 X-Priority: 3 X-MSMail-Priority: Normal Received: from majordom by post.thorcom.com with local (Exim 3.16 #1) id 14D7GR-000753-00 for rsgb_lf_group-outgoing@blacksheep.org; Mon, 01 Jan 2001 15:52:47 +0000 Received: from finch-post-10.mail.demon.net ([194.217.242.38]) by post.thorcom.com with esmtp (Exim 3.16 #1) id 14D7GQ-00074y-00 for rsgb_lf_group@blacksheep.org; Mon, 01 Jan 2001 15:52:46 +0000 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Received: from pickmere.demon.co.uk ([158.152.117.143]) by finch-post-10.mail.demon.net with smtp (Exim 2.12 #1) id 14D7GI-0006Q4-0A for rsgb_lf_group@blacksheep.org; Mon, 1 Jan 2001 15:52:38 +0000 Message-ID: <+vTtxDAsFKU6Ew1Z@pickmere.demon.co.uk> Date: Mon, 1 Jan 2001 15:25:32 +0000 To: rsgb_lf_group@blacksheep.org From: "M.J.Powell" Subject: Re: LF: BIG/SMALL ANTENNAS References: <000e01c073ea$e1eb2740$3a47883e@default> In-reply-to: <000e01c073ea$e1eb2740$3a47883e@default> MIME-Version: 1.0 X-Mailer: Turnpike Integrated Version 4.02 S Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group Sender: In message <000e01c073ea$e1eb2740$3a47883e@default>, MAL HAMILTON writes >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. What if there is say, 100w, into each Rr? Mike -- M.J.Powell