Hi Erwin
Thanks for your reply. You are correct... I did change the monitor and that reduced the
noise somewhat..
The real problem was that the PCB board that had the female USB-b socket mounted on
it did not ground the shield of the socket.
When I found that, I ran a chassis ground to the shield and the receiver quieted with the usb
plugged in...
I think that will fix the problem..
Thanks for your response and help, Erwin.
73's
Doug WA3ZHG