Return-Path: Sender: (Marvin Kaye) To: lml Date: Tue, 26 Aug 2003 11:00:42 -0400 Message-ID: X-Original-Return-Path: Received: from cepheus.email.starband.net ([148.78.249.123] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2547405 for lml@lancaironline.net; Tue, 26 Aug 2003 10:43:39 -0400 Received: from regandesigns.com (vsat-148-63-101-227.c002.t7.mrt.starband.net [148.63.101.227]) by cepheus.email.starband.net (8.12.9/8.12.9) with ESMTP id h7QEh63o011588 for ; Wed, 27 Aug 2003 04:43:13 +1400 X-Original-Message-ID: <3F4B71F7.5050604@regandesigns.com> X-Original-Date: Tue, 26 Aug 2003 07:43:03 -0700 From: Brent Regan User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.0.2) Gecko/20021120 Netscape/7.01 X-Accept-Language: en-us, en MIME-Version: 1.0 X-Original-To: Lancair Subject: Re: Antenna Performance Demo Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Thank you Charles, for the detailed explanation(s). I found them enlightening. Your reference to EMI bears repeating as we need to understand the principles of electromagnetic radiation in order to build electrically "quiet" airplanes. Know how to make an antenna and then don't do that when you wire your airplane. Regarding COM antennas and ground plane configurations, if I may summarize: Antenna on glass epoxy airplane without a ground plane--- BAD Antenna on carbon epoxy airplane without a ground plane--- POOR Antenna on carbon epoxy airplane with a ground plane inside--- OK Antenna on carbon epoxy airplane with a ground plane outside--- BEST This theoretical ranking is supported by anecdotal reports but a quantitative analysis will have to wait for testing. Regards Brent Regan