Return-Path: Received: from mx1.hcvlny.cv.net ([167.206.112.76]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 29 Aug 2000 19:02:45 -0400 Received: from s1.optonline.net (s1.optonline.net [167.206.112.6]) by mx1.hcvlny.cv.net (8.9.3/8.9.3) with ESMTP id TAA16177 for ; Tue, 29 Aug 2000 19:09:24 -0400 (EDT) Received: from barkerasset (d127-13.smfrct.optonline.net [24.188.127.13]) by s1.optonline.net (8.10.2/8.10.2) with SMTP id e7TN9Oh27881 for ; Tue, 29 Aug 2000 19:09:24 -0400 (EDT) Message-ID: <006c01c0120e$9b573640$0d7fbc18@barkerasset> From: "Robert R Barker" To: "Lancair builders" Subject: RF interference and fuel gauges Date: Tue, 29 Aug 2000 19:12:30 -0400 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Some fuel sending units are wire wound resistors across which there is a slider controlled by a float in the tank. The resistance wire is close wound around an insulator. This is the definition of a coil. A coil without a capacitor is a very broad band receiver. Try putting a small capacitor across the sender. You now have a tuned circuit. If there is any change you are on the road to solution. Experiment with capacitances. If there's no change just cuss me out. I trust the problem occurs on the ground, and with a handheld comm and easy access to the sending unit connection the cussing should,t be too bad. Bob Barker >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>