[time-nuts] New GNSS chipsets

[Mark Sims]

I was measuring the jitter and adevs of the PPS signal from a GT-8736.   GPS only seems to be slightly better (1-3 ns more span) than GPS+GLONASS.  GLONASS only seems have around 50% more jitter than GPS only.  Glonaas only adevs are 3 times as large as GPS only (at tau=10000 seconds).  
 
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> It is indeed a benefit to use the different constellations.