"w_tom" wrote in message
...
Or the regulator inside the alternator is a source of RF.
There are just too many other potential reasons to but only
blame a computer or instrument cluster.

most likely the comp.


Cars do not come from the factory with static.

you have obviously never worked in the auto sound biz.

Number one
reason for static would not be cured with RF choke.

rf may enter through the power and/or clock wires if not adequately bypassed
in the radio

Furthermore, the RF choke would not identify noise entering
due to bad ground.

bad ground usually means no power at all.

Better is to first learn what has been
changed - to have created this problem. To have better help
from the newsgroup, the OP must provide model, year, what is
and is not original in the vehicle, what has changed, etc. By
rationing facts, his responses can only be speculative - not
very helpful.

TimPerry wrote:
the cars onboard computer or instrument cluster is generating RF.

"fish" around with a portable radio to localize the problem.

recheck the car antenna system. try a RF choke on the DC power wire(s)

many car radios have an antenna trim adjustment for the AM section. when
this is misadjusted the AM signals are weaker and noise is greater.