Xref: utzoo sci.electronics:5058 rec.audio:10668 rec.autos.tech:6404
Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!nrl-cmf!ukma!tut.cis.ohio-state.edu!ucbvax!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!ukc!strath-cs!glasgow!singleto
From: singleto@cs.glasgow.ac.uk (Jon Singleton)
Newsgroups: sci.electronics,rec.audio,rec.autos.tech
Subject: Re: Noise suppression in autos
Summary: Reply to RON_B@APOLLO.COM cos mailing didnt work.
Message-ID: <2360@crete.cs.glasgow.ac.uk>
Date: 5 Feb 89 14:35:29 GMT
References: <4131b4d9.16321@apollo.COM>
Reply-To: singleto@cs.glasgow.ac.uk (Jon Singleton)
Followup-To: Radio Interference by Ron B.
Organization: Comp Sci, Glasgow Univ, Scotland
Lines: 30

To Ron Buttiglieri:


RADIO INTERFERENCE IN AUTO


The interference is generated by a.c. generating items on the engine.
Because of the changing current it creates pops in the radio signal.
The way to eliminate them is to wire a capacitor to the offending items; this
smoothes the changeover between current directions and will diminish or
eliminate the interference.
I think the capacitor should be simply sited on the item so that it earths to
it and the input connected to a wire on the item from elsewhere in the cars
electrical system.
There are 2 items that cause it: the alternator/dynamo and distributor.
A Haynes Auto Manual on your car will tell you where and how to fit these in
one of the chapters near the end.
The size of capacitor is important so look at a Haynes book,ask the car
manufacturer or an auto electrician to clarify.
Don't treat any of this as gospel as its 2 years since I did it to my car
and that was the first time!

Hope I've been of help.
			- Jon Singleton.

-- 
*   Janet | singleto@uk.ac.glasgow.cs        | J.H. Comp. Sci. Department     *
*  USEnet | mcvax!cs.glasgow.ac.uk!singleto  | University of Glasgow          *
* ARPAnet | singleto@cs.glasgow.ac.uk        | Glasgow,Scotland, U.K.         *
---- Confucious says "he who cooks beans & peas in same pot is unhygenic". ----