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From: sjl@hropus.UUCP (Steve Leitman)
Newsgroups: net.auto,net.audio
Subject: Problem with auto ignition induced noise.
Message-ID: <262@hropus.UUCP>
Date: Tue, 11-Feb-86 10:53:53 EST
Article-I.D.: hropus.262
Posted: Tue Feb 11 10:53:53 1986
Date-Received: Wed, 12-Feb-86 08:17:20 EST
Distribution: na
Organization: Bell Labs, Holmdel, NJ
Lines: 14
Xref: watmath net.auto:9382 net.audio:7572

I've recently installed a AM/FM cassette deck in my car along
with a graphic equalizer/amplifier. I notice that when the ge/amp
is on, I hear a background whine with frequency proportional to
engine rpm. I presume the ge/amp is picking up ignition noise.
(I don't hear the background whine when using only the AM/FM deck).
Has anyone installed noise suppressors for this type of problem?
I've seen suppressors sold that fit in the distributer terminal
(inline with the main high voltage cable). Has anyone used this type?
Is it effective and does it adversely affect engine performance?
Any other ideas for ignition noise supression will be appreciated.

Thanks in advance for your feedback in helping stop mine!

Steve Leitman