Thanks for the replies, all. I'm using a laptop PC with 3 USB ports. With mouse, keyboard, harddisks and other devices I am using 3 USB hubs.... Plugging the cable from the K3 directly into a USB port on the PC does not remove the noise. The hub doesn't have a PSU, but there are a lot of small switch mode PSU's in the shack of course. The noise is present regardless of HRD is running or not... It is really not good to keep the log on paper. What can I do? \Svend
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