Ferrite clips/donuts are recommended and easy to install. Put capacitors in parallel with the power, exact values vary. If you are feeling really ambitions, a

Ferrite clips/donuts are recommended and easy to install. Put capacitors in parallel with the power, exact values vary. If you are feeling really ambitions, add ferrites in series with the power lines or give the dongle a solid metal enclosure. The simplest is using a usb extension cable, the computer itself generates large amounts of broadband noise. http://electronics.stackexchange.com/questions/25951/ http://electronics.stackexchange.com/questions/25951/ http://electronics.stackexchange.com/questions/36040/ http://electronics.stackexchange.com/questions/36040/