i have power from the battery wich is located in the back of the car where the carpc also is located so that is a verry short cable connection.
the vga and usb cable for the lilliput monitor is going true the left side of the car to the dashboard.
the blue switch on ignition power cable i have taped from the cigarette ligter cable and goes on the right side to the back side of the car where the carpc is.
could be that the antenna cable is also on the right side somewhere and interfer with the carpc ,i will look into it the comming days
i also was thinking that the usb bluetooth adapter make some noise on the radio...
i must test that to ..
I also think about trying an external widow based antenna..
Thanks for the reply everyone