KP,

You didn't mention what type of vehicle was involved. Sounds like it's not
the radio, but something in the vehicle. If its under warranty, bring it to
the dealer, they ought to straighten it out.

-Steve


"KP" wrote in message
...
This one is driving me nuts. I had a decent JVC Car stereo. When it
starts getting cold here the reception of most AM stations gets
horrible - a high pitched whine accompanies most signals. Thinking
the JVC was at fault, I purchased a top of the line Pioneer unit. SAME
PROBLEM! It gets weirder. If I take a portable radio into my car,
with the car running, and the Pioneer turned off, no problem with the
signal on the portable. As soon as I turn on the Pioneer, the
portable makes the same high pitched whine!

To recap:
-No problems in the summer, only when it is cold outside!
-Taking a portable radio into the running car does not exhibit the
problem, so I don't believe that there is interference from the car.
-Turning on the car radio causes the exact same interference on a
portable radio in the car.
-I have tried 2 different brands and both had the problem.

Any help or ideas would be greatly appreciated.