[time-nuts] Setting correct date on Trimble Thunderbolt receiver

Tom Van Baak tvb at LeapSecond.com
Mon Mar 26 23:49:13 UTC 2018


Don,

The primary purpose of a Thunderbolt GPSDO is ultra-precise time (1PPS) and frequency (10 MHz), locked to each other, and to UTC. The good news is these two BNC outputs are unaffected by the date issue that you describe. The TBolt is designed to run fine on its own; you typically don't need a PC or control program to operate it.

The bad news is that if you use the Trimble TSIP RS232 interface and if you want the correct date & time then the software needs to be aware of the 1024 week (19.6 year) epoch. This "GPS 1024 week rollover" issue eventually affects many receivers, including the TBolt, but the good news is that simple work-arounds are often available to address the problem.

AFAIK, the Tboltmon.exe program has *not* been updated. I still use it (when you're dealing with nanoseconds, calendar dates are less important).

Mark's LH program *has* been updated. See: http://www.ke5fx.com/heather/readme.htm

Didier's LCD date/time display *has* been updated: http://www.ko4bb.com/Timing/GPSMonitor/kit.php

/tvb

----- Original Message ----- 
From: <donandarline at gmail.com>
To: <time-nuts at febo.com>
Sent: Monday, March 26, 2018 2:17 PM
Subject: [time-nuts] Setting correct date on Trimble Thunderbolt receiver


> Hello all,
> I am new to the board and have just received a Trimble Thunderbolt GPS receiver today.
> All is working correctly except the date shows Aug 10 1998.
> How do set the proper date on this?
> I am running TBoltMon to access the unit.
> Any help would be appreciated.
> Thanks,
> Don W9BHI
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