What I'd like to find out is how accurate a GPS Disciplined_Rb_Osc can be made compared to the typical Cs out there.
Warren, Most modern GPSDO will outperform rack-mount Cs in stability as the tau grows beyond a day or a week. Of course, it depends quite a bit on the particular GPSDO or the brand of Cs but in general GPSDO's are really good and always "win" in the end because they are locked to UTC and a free-running Cs isn't. Some of my 5071A flicker out at 5e-15. It takes a 4 ns RMS GPS timing receiver about 10 days to get to the same point. Remember that a GPSDO is a really just a radio receiver, a time-transfer device, a slave repeater; not strictly a "clock". So their superior long-term performance isn't surprising. It also explains why there's a huge market for GPSDO products and a very small market for large stand-alone Cs standards. The surplus Z3801A and Thunderbolts that hit the eBay market this decade have been the greatest treat any amateur could possibly have hoped for! I have a couple of suggestions for you; in another posting. /tvb _______________________________________________ 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.
