I noticed the same John. I fired up the TBolt and it was not working fine till I set my location and height above sea level. Our city is about 928M ASL.
I must again check with a newer GPS for better coordinate accuracy. Initially only two SV's lit green, after I set the co-ordinates then all are green. Now the 10MHz is jumping between <0.1 >0.00 ppb. comparing with a a FE5680. >I started out using an oscilloscope and comparing OCXOs to my Z3801 GPSDO. >Later I used it to compare an LPRO 101 to the Z3801 and finally, a TBOLT. I >later acquired a Racal 1992 which makes things a little easier but no more >accurate in my opinion. If you are looking at frequency difference or >frequency drift, and not stability, either of these methods and a stopwatch >will get pretty good results. It took me a couple of days to get an LPRO >adjusted so that I saw one cycle slip every few hours. It takes patience. >The thing that surprised me was how much a TBOLT moved around compared to my >Z3801. Though it stayed within one cycle because it was "phase locked", it >jumped around a good bit while the LPRO just slowly slipped in one direction >or the other. -- Raj, VU2ZAP Bangalore, India. _______________________________________________ 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.