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). --------------------- > It is indeed a benefit to use the different constellations.