[time-nuts] Trimble/Nortel 45000 GPSDO

[Mark Sims]

I suspect that the 45000 is a cost reduced version of the NTGS0AA.   It has to be cheaper to produce and install a single board rather than two boards connected by a cable.   Also the 45000 has considerably fewer parts than the NTGS50AA.   They probably decided that they did not need as much gain and dropped an amplifier stage.   It is a solid 6-7 dB less sensitive.


Another possibility is that they updated to board to get rid of some obsoleted components.

My 45000's have the 34310-T (not T2) oscillators.   After 4 days they are ageing at a rate of -5E-10 parts/day.  This is a factor of 10 worse than the -T2 version was at the same time.  Also the OSC and PPS numbers are considerably worse.   It would be interesting to put a -T2 onto the 45000 board and see how it performs (i.e. is it the board or oscillator).