It happened here too.  It is reporting having the 3.0 firmware.  Right at the 
time Tom said.  Fortunately I am simply using this unit for PPS and nothing 


-----Original Message-----
From: time-nuts [] On Behalf Of Tom Van Baak
Sent: Saturday, July 29, 2017 18:16
To: Discussion of precise time and frequency measurement <>
Subject: Re: [time-nuts] Trimble Thunderbolt no longer determines the correct 

Caught it. Some Trimble Thunderbolt TBoltmon.exe screen shots attached:

GPS WN 1959 TOW 604799 (July 29, 2017 23:59:41) advanced to GPS WN 936 TOW 0 
(December 13, 1997) instead of GPS WN 1960 TOW 0 (July 29, 2017 23:59:42).

1960 - 936 is 1024 weeks, as advertised for this version of the TBolt GPSDO. 
Note this happened at 23:59:42 UTC as expected (that's GPS midnight - 18 UTC 
leap seconds). I did not expect the reported 2.75 us 1PPS phase change and will 
look into that.


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