On Thu, May 17, 2018 at 7:19 PM, Clay Autery <caut...@montac.com> wrote:
> Anyone who is using one (or both) of these, and/or folks who have a > logical opinion: > - Not sure how much I plan to have the unit connected via USB. Beyond > curiosity data gathering for a while, I'm thinking at some point I want it > to be disco'd and forgotten. One less potential USB cable radiating or > needing ferrites. > I have the Bodnar Mini which only has a USB connection. You can connect it to a USB power only source. I have found a large variation (20 dB) in close in phase noise, depending on how clean the power source is. I am using a power only wall wart with an added series ferrite core / shunt cap to get acceptable results ( -103 dBc/Hz at 10 Hz offset). I don't know if there is more internal filtering on the separate power input of the 2 output version. So far peak ADEV at Tau = 20s is about 2e-10. It would be nice to improve that. You can also get widely varying spurs, phase noise and ADEV depending on the register values chosen to provide a specific output frequency. Many different sets of register values may be used to provide the same output frequency. I have not determined a pattern. I just calculated different values and tried them out. Regards, Mark W7MLG _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.