[Shop-talk] I hate static

[Chris Kantarjiev]

It's a little surprising that you don't have the problem on battery
power, since the antenna/power cord is in the same place - it's almost
as if the radio's power supply itself is the issue.

I'd start by putting a ferrite on the power cord, near the radio. Something
like 

http://www.radioshack.com/product/index.jsp?productId=2103222&cp=&sr=1&origkw=ferrite+snap&kw=ferrite+snap&parentPage=search

though I'm not entire sure how it will affect the antenna that is
also inside the cable (and running through the core)!