On Thu, 15 Sep 2011 17:56:12 -0400, Joe from Kokomo wrote:

On 9/15/2011 4:54 PM, Hatfield wrote:

For example: Sony Shortwave CDX-GT570S

I would be curious for anybody's experience about how much interference
a running motor makes to this radio's SW reception while traveling down
the road?

Basically, what you ask is dependent on the individual -vehicle-.
Depends on how well shielded the ignition system is, what the numerous
computers and data buses are radiating and how quiet the fuel pump is.

I've even seen a case where, if the car next to you was listening to a
certain commercial FM broadcast station, its receiver oscillator would
interfere with a specific two meter ham repeater you were listening to
in your car.

Be careful. A lot of modern cars have tuned active antenna systems and
you might need a separate passive whip for the SW.