Hi Jim,

I probably should have mentioned that once the car is started there is no
noise. So I've ruled out ignition EMF.

The noise spikes are only present during initial startup and upon shutdown.
They only last a fraction of a second. That's why I think it comes from the
alternator field building on stratup and collapsing on shutdown.

Richard


On Wed, Jan 5, 2011 at 3:32 PM, Jim Santee  wrote:

>  Go to a professional two way radio shop =96 NOT RADIO SHACK =96 and purc=
hase
> an ignition noise suppression kit. Some professional marine dealers have
> these as well. What they usually consist of are high quality by-pass
> capacitors placed on the alternator and ignition module. One point: Check
> with your automobile dealer service department to ensure you will not voi=
d
> your warranty or damage your ignition system. Thirty years ago this would
> not have been necessary as there were no computers or sensors in the
> electrical systems of cars.
>
>
>
> Police cars have radio interference problems so these kits are fairly
> common. Finding a kit for your car should be easy.
>
>
>
> Jim Santee
>

Hi Jim,
I probably should have mentioned that once the car is started there is n=
o noise. So I've ruled out ignition EMF.
The noise spikes are only present during initial startup and upon shutdo=
wn. They only last a fraction of a second. That's why I think it comes =
from the alternator field building on stratup and collapsing on shutdown.

Richard


On Wed, Jan 5, 2011 at 3:32 PM, Jim Santee <jsantee@...........
om> wrote:




Go to a professional two way radio shop =96 NOT RADI=
O SHACK =96 and purchase an ignition noise suppression kit. Some profession=
al marine dealers have these as well. What they usually consist of are high=
 quality by-pass capacitors placed on the alternator and ignition module. O=
ne point: Check with your automobile dealer service department to ensure yo=
u will not void your warranty or damage your ignition system. Thirty years =
ago this would not have been necessary as there were no computers or sensor=
s in the electrical systems of cars. 

=A0
Police cars have radio interference problems so thes=
e kits are fairly common. Finding a kit for your car should be easy. =A0
=A0

Jim Santee
=