Return-Path: Received: from sphmgaad.compuserve.com ([149.174.177.149]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Fri, 22 Sep 2000 10:46:09 -0400 Received: (from mailgate@localhost) by sphmgaad.compuserve.com (8.9.3/8.9.3/SUN-1.9) id KAA25865 for Lancair.list@olsusa.com; Fri, 22 Sep 2000 10:53:06 -0400 (EDT) Date: Fri, 22 Sep 2000 10:51:07 -0400 From: James Frantz Subject: EMI/RF and false oil and fuel indications Sender: James Frantz To: Marve Kay Message-ID: <200009221052_MC2-B446-9D4E@compuserve.com> X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> >I think the VM 1000 and Electronics International may have some problems. Anyone else having this problem? Anyone solved it yet? Any suggestions? < It is well documented that the Electronics International is subject to the problem you describe (see the Lancair Network News for solutions). I am using the VM800 with out any problems and know of many other VM 1000 installations that do not have the problems you describe. These are tricky problems to resolve. The first thing you might consider is to disconnect the coax from the COM radio and in its place install a portable length of coax with a conventional antannae and ground plane. Move the temporary antannae and coax to various locations and see if the problem still exists. You may find that the solution is to simply relocate the coax. You may also discover that your installed coax or antannae is damaged resulting in lots of RF spewing out the cable rather than the antannae. Simple solutions like putting a 2 or 3 loops in the fuel sensor cable (try several diameters) or installing a bead core around the sensor cable that is designed to filter electromagnetic interference may also solve the problem. Bead cores are available from many electronic stores. I believe those cylinderical buldges on your computer monitor cable are bead cores just so you know what I am talking about. The best technique to avoid these troubling problems is to observe good wiring practices from the start. Not routing coax, power and sensor cables in the same harness is a good practice. When power cables, coax and sensor runs need to cross, do so at 90 degree angles. Always shield the sensor cables grounding the shield at only one end, etc. and etc. Even then, there are no guarantees. Good luck. Jim Frantz >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 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. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>