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
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 DougWA3DSPhttp://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*
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Hi Doug, I've experienced that same situation when running high power on HF. I solved it with careful application of ferrites and other RF suppression means....Note that most "snap-on" RFI suppressors don't do much on HF, especially the low HF bands--you'll probably need many turns of the USB cable thru the core(s) to do anything at all. This is a situation where some RF analysis tools come in handy. I've got an AIM-4170C, which is an incredible help to tell if/when some suppression method is heading in the right direction! Anyhow, good luck, I've been there, too! This just shows how much unexpected RF can be floating around when using various radios and amps! Merry Christmas and Happy New Year! 73, David KB4FXC On Tue, 24 Dec 2013, Doug Crompton 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
OK thanks for all the feedback. I am sorry others are having the same problem but glad I am not alone. This is the first time I have had this problem and I have a lot of wired cat 5/6 and USB floatng around the house. I wonder if the DMK is more sensitive to this. I wrapped multiple loops of the USB cable through a ferrite core and both ends. I will see how that works. 73 Doug WA3DSP http://www.crompton.com/hamradio
Date: Wed, 25 Dec 2013 11:19:55 -0500 From: kb4fxc@inttek.net To: doug@crompton.com CC: app_rpt-users@ohnosec.org Subject: Re: [App_rpt-users] USB EMI?
Hi Doug,
I've experienced that same situation when running high power on HF. I solved it with careful application of ferrites and other RF suppression means....Note that most "snap-on" RFI suppressors don't do much on HF, especially the low HF bands--you'll probably need many turns of the USB cable thru the core(s) to do anything at all. This is a situation where some RF analysis tools come in handy. I've got an AIM-4170C, which is an incredible help to tell if/when some suppression method is heading in the right direction!
Anyhow, good luck, I've been there, too! This just shows how much unexpected RF can be floating around when using various radios and amps!
Merry Christmas and Happy New Year!
73, David KB4FXC
On Tue, 24 Dec 2013, Doug Crompton 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
participants (3)
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Chuck Henderson -
David McGough -
Doug Crompton