Return-Path: Received: from smtp.digital.net ([206.228.237.7]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Tue, 23 Mar 1999 06:47:34 -0500 Received: from ddi.digital.net (ddi.digital.net [198.69.104.2]) by smtp.digital.net (8.9.1a/8.9.1) with ESMTP id GAA12674 for ; Tue, 23 Mar 1999 06:47:41 -0500 (EST) Received: from john (max-roc1-65.digital.net [206.228.234.65]) by ddi.digital.net (8.9.1a/8.9.1) with SMTP id GAA25267 for ; Tue, 23 Mar 1999 06:49:34 -0500 (EST) Message-Id: <3.0.3.32.19990323064934.02f9ccfc@mail.digital.net> Date: Tue, 23 Mar 1999 06:49:34 -0500 To: lancair.list@olsusa.com From: John Cooper Subject: Re: LC20 - COM Antenna Location VHF-5T In-Reply-To: <001601be74b4$b4de37b0$0113a8c0@triton> X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> The erratic readings on your electric gages when you keyed your comm transmitter were due radiation from your antenna feedline. This, in turn, was due to a mismatch between the feedline and the antenna (probably). A couple of things: http://www.aeroelectric.com has an antenna analyzer which you can rent for a month for only $25. You can use it to test out your system and see what the problem is. Bill Archer makes a comm antenna which can be mounted in the baggage compartment: The SA-006. Chief Aircraft carries them http://www.chiefaircraft.com And yes, your comm antenna is vertically polarized, while your nav antenna is horizontally polarized