[time-nuts] NTGS50AA, better than Thunderbolt?

[Mark Sims]

A few people asked for some data on the Trimble 34310-T2 oscillator aging.   Here are a couple of graphs.  WEEK1.GIF started a couple of hours after I first powered on the unit after it had been shipped from Old Cathay.  It had around 5E-10 parts/day aging over the first three days.  That jump in the DAC graph happened when I changed out the pigtail adapter to the antenna cable.  The unit went into holdover and came back out with that "retrace" offset. WEEK2.GIF shows the last two days of data from the second week after power-up.  Aging is now down to 6E-13 parts/day!  The PPS and OSC rms values are down to freaky good levels also.

I don't know if the NTGS hardware itself is any better than the Tbolt hardware,  but that oscillator seems to be rather nice (but could still have hideous phase noise) 		 	   		  
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