The attached URL is a 11 day plot of a 30.5 GHz carrier taken every minute by an Agilent 53152A microwave counter. The Mini-T has an ovenized oscillator. It appears that the GPS attempts to over correct the oscillator, hence the large frequency excursions. The real large excursions, around the 96 hour range, were due to a loose connector. The requirements are such that over a 90 day period the total frequency drift shall be no more than 1 KHz. Someone in their ultimate wisdom, decided that since they do not have the time to take measurements for 90 days, they will take it for 24 hours and not allow any frequency excursions over 11 Hz at 30.5 GHz. Obviously, this plot does not pass their requirement. When the oscillator is allowed to free run, the frequency jumps are not there. Has any one else made any measurements on the Trimble Mini-T. Any observations or suggestions are appreciated. Regards - Mike
http://www.eozinc.com/11dayplot.pdf Mike B. Feher, N4FS 89 Arnold Blvd. Howell, NJ, 07731 732-886-5960 _______________________________________________ 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.