I have the same thing. I put some ferrite cores on the usb cable and on the audio and control lines both at the computer, the usb device and at the radio end of the connection and it helpedI then added some smaller ferrite cores to each individual conductor at each end and that helped even more, Then cutting the transmit power in half took care of the rest of the EMI problem.

Good luck.

Merry Christmas

Chuck CCIE2285, WB9UUS

On Tue, Dec 24, 2013 at 2:53 PM, Doug Crompton <doug@crompton.com> wrote:

I had to restart asterisk after I got this message and my DMK went batty keying the transmitter at some crazy rate sounding like CW.

Dec 23 22:07:13 WA3DSP_Allstar kernel: hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling...

Curious about the EMI? because I was operating 75 meters phone 600 watts at the time this happened. The server and USB to DMK cable are in the basement well away from the antenna so I don't know if it is a coincidence or not. Anyone else ever seen this? Does the EMI in the message mean electromagnetic interference?

73 Doug
WA3DSP
http://www.crompton.com/hamradio

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