Digger do you have any other uBitxs? I currently do not have a good known noise source (Working on it! but alas the day job has its priority :( ) So it is currently out of my capability to make comparison measurements. I do know that those numbers are on the order of about 3x lower then they should be based on the non scientific measurements I have taken on my unit.
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Tim Keller - KE2GKB