Hal, I suppose your opinion is correct. A friend has found the same problem with an HPZ3016A GPSDO. The solution was to resetting the internal counter inside the Motorola GPS module. To do this , the friend has removed the GPS module and communicate using his proper serial port to reset the internal counter. I have not some more details about the operation, but if request I can ask him.
Luciano
Da "time-nuts" time-nuts-bounces@febo.com
A "Discussion of precise time and frequency measurement" time-nuts@febo.com
Cc hmurray@megapathdsl.net
Data Tue, 29 Aug 2017 22:36:59 -0700
Oggetto Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date
w9ac@arrl.net said:
So, at this time is there a viable solution that will make the LCD read the
proper date? I am less concerned about the date showing accurately on the
desktop Thunderbolt Monitor program. Many thanks!
It's the GPS rollover problem. There is a 10 bit field for the week number
in the data from the satellites. After you decode the date/time you have to
compare what you get with a magic date. The magic date is typically the time
the software is compiled or a constant in the code that is whenever the
programmer last updated it. If the GPS date is earlier, add 1024 weeks.
Repeat if necessary.
The simple solution is to fix the software driving the display, It's 2 or 3
lines of code in the right place. If you can't do that, you might be able to
insert something between the TBolt and the display that will fixup that slot.
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Hal, I suppose your opinion is correct. A friend has found the same problem with an HPZ3016A GPSDO. The solution was to resetting the internal counter inside the Motorola GPS module. To do this , the friend has removed the GPS module and communicate using his proper serial port to reset the internal counter. I have not some more details about the operation, but if request I can ask him.
Luciano
Da "time-nuts" time-nuts-bounces@febo.com
A "Discussion of precise time and frequency measurement" time-nuts@febo.com
Cc hmurray@megapathdsl.net
Data Tue, 29 Aug 2017 22:36:59 -0700
Oggetto Re: [time-nuts] Trimble Thunderbolt no longer determines the correct date
w9ac@arrl.net said:
> So, at this time is there a viable solution that will make the LCD read the
> proper date? I am less concerned about the date showing accurately on the
> desktop Thunderbolt Monitor program. Many thanks!
It's the GPS rollover problem. There is a 10 bit field for the week number
in the data from the satellites. After you decode the date/time you have to
compare what you get with a magic date. The magic date is typically the time
the software is compiled or a constant in the code that is whenever the
programmer last updated it. If the GPS date is earlier, add 1024 weeks.
Repeat if necessary.
The simple solution is to fix the software driving the display, It's 2 or 3
lines of code in the right place. If you can't do that, you might be able to
insert something between the TBolt and the display that will fixup that slot.
--
These are my opinions. I hate spam.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
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