Return-Path: Received: from uhura.concentric.net ([206.173.118.93]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Wed, 27 Oct 1999 12:22:53 -0400 Received: from cliff.concentric.net (cliff.concentric.net [206.173.118.90]) by uhura.concentric.net (8.9.1a/(98/12/15 5.12)) id MAA19341; Wed, 27 Oct 1999 12:27:06 -0400 (EDT) [1-800-745-2747 The Concentric Network] Received: from micron300 (ts004d28.lon-co.concentric.net [207.155.172.184]) by cliff.concentric.net (8.9.1a) id MAA11175; Wed, 27 Oct 1999 12:27:03 -0400 (EDT) Errors-To: Message-ID: <004b01bf2098$0d3295c0$0300a8c0@micron300> From: "Ron Galbraith" To: "DON J RYAN" , "LANCAIR LIST" Cc: "Greg Nelson" References: <000201bf2091$2f164a80$2e50aecf@djpryan.ruralnet.net> Subject: Re: RADIO INTERFERENCE Date: Wed, 27 Oct 1999 10:25:36 -0600 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Have you tried different microphones? When you are on the ground, the engine noise would be pretty low, and when you get in the air, the cockpit overall noise would be high, which very well might be the source of your noise. Being an air traffic controller for my job, and a ham radio operator for a hobby, I hear just about everything you can imagine. The mic would be the first place to start. Do you only have one radio installed? If you have more than one, it's possible that they are transmitting at the same time, and since the aircraft band is AM, this causes a hetrodine, which sounds like a squeel, or tone when you transmit. Another possiblility is that you have a ground loop, or a sheilded mic cable that's ground is intermittant, or signal wire is intermittant, and is aggravated by vibration. You might get on a not used frequency in your area, and while transmitting, wiggle your mic cables, and even your mic jacks, to see if you can make any sort of change in the sound, or hear a crackling noise which would indicate a short, or faulty wire. There could be alot more to it, but this would be the things you need to eliminate first. Ron Galbraith LNCE -N5ES >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html