[time-nuts] Trimble Thunderbolt no longer determines the correct date

David G. McGaw david.g.mcgaw at dartmouth.edu
Fri Jul 28 14:48:38 EDT 2017

It appears there is no command to set the current time in the 
Thunderbolt.  Too bad.  I have some very old Garmin OEMs (GPS35) that 
work fine as long as I set the time and date to be close.  I just had to 
do a RAM reset ( $PGRMI,,,,,,,C <CR> <LF> ) on one which had gotten 
corrupted and would not report position properly (all zeros).  After 
reset, once it got its initial fix it was reporting a date in 1997, but 
reports correctly now that the time and date were set (also using the 
$PGRMI command).  It even has the current GPS week (1959) correct.

David N1HAC

On 7/28/17 11:36 AM, Dave B via time-nuts wrote:
> Interesting.
> What about NTPD implementations, when using a TB as the reference time
> source?  Does that handle the week count roll over as well?  If that was
> added, from what version?
> I suspect I may have some updating to do!   I use a TB as a frequency
> ref' and local NTP/NTPD server reference.
> The local TB here is showing "week 1959" top left of LH's display window
> (Rev 5.01)
> Cheers.
> Dave G0WBX.
> ------------------------------------------------------------------------
> On 28/07/17 08:14, time-nuts-request at febo.com wrote:
>>> Well quite an unpleasant surprise. So after the 30th do the TBolts stop
>> Paul,
>> This topic has been covered a number of times over the years. Some time-nuts have even run TBolt's under GPS simulators to verify that the 10 MHz and 1PPS outputs will be fine. So apparently the only effect is that the date & time (in binary TSIP messages) are off by 1024 weeks. This rollover-related effect is by now a "common" issue with many GPS receivers.
>> The current version of Mark's Lady Heather program has code to detect this and fix it so you're good to go for the next 19.6 years.
>> /tvb
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