USB line impedance seems to be really bad about uhk60v1-electronics

[dpiegdon]

Oh I forgot to note down the version. On the PCB there is a sticker with:

UHK60 V7.8
02578
2018/09/28

[mondalaci]

Thanks so much for your detailed feedback, and sorry about the issues you've experienced, David!

Admittedly, we haven't examined USB line impedance thoroughly because USB has been very stable for most so far. We've received about a dozen reports which may be related to this, and so far each of them could be solved by connecting the UHK via a (powered?) USB hub, not connecting it via a hub, or using a less noisy power supply.

The dangling traces are for testing, indeed. We'd leave them the way they are, especially if they don't make a change because they're very useful for factory testing.

I'm closing this issue because we can't do anything for the current UHK revision, but we'll make a better job for the next revision.