Hi The short term plot on the FE's follows a straight line from 1ms out to 100 sec. No bumps close in.
Bob On Feb 4, 2012, at 6:23 AM, [email protected] wrote: > John > Thank you for your effort. It would be nice if you could confirm the 4 to 5 > Hz dither that seems to be the loop time constant and long term aging that > will influence the GPS/Rb control loop time constant setting. I did see 1 > E-12 per month which may be unique to that unit. > Bert Kehren > > > In a message dated 2/3/2012 10:19:47 P.M. Eastern Standard Time, > [email protected] writes: > >> Someone earlier today made the point that for all the talk about the FEI >> rubes, there hasn't been any real performance info posted. That prodded >> me to start an experiment I've been meaning to do for a while. I have >> samples of all three of the common telco Rb standards -- Efratom FRS, >> Datum LPRO, and Fe8-5680. >> >> Over the next couple of days I'll do measurement runs of each of the > three >> versus an HP-5065A laboratory Rb (for ADEV), and a Wenzel ULN (for phase >> noise). I'll collect long enough to get solid ADEV out to at least 1000 > second >> tau on each unit. I have the FRS test running now. >> >> If all goes well, I'll post the results early next week. > > I'm doing some short-term runs on the ones I have around here, as well > (FE-5680A, PRS-10, LPRO). Will be interesting to see how close ours are. > > So far, the FE-5680A is doing well in the ADEV department, but its AD9832 > DDS chip adds some substantial noise and spurs to the 10 MHz output. Does > yours have that chip? I understand that some of them didn't. > > The overall SSB C/N ratio I'm seeing between 1 Hz - 100 kHz is pretty much > in line with Analog Devices' data sheet, as are the spur levels. > > -- john > > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
