[time-nuts] Thunderbolt GPS rollover

[Bob Camp]

HI

The TBolt does not directly display any date or time data. All it really puts out are PPS and 10 MHz. The rest of the stuff needs a chunk of software to make any sense at all out of. What you *really* need is a friend writing the software who is willing to drop in a auto correct routine some time before 2017. 

I realize that only gives us a bit over 4 years to get on somebody's good side *and* for them to put in something less than a hundred lines of code. ….

Of course it is open source, so I suppose one could fix it themselves. Somehow that sounds far to much like work.

Bob


On Jun 7, 2012, at 6:34 PM, Azelio Boriani wrote:

> So we must find a way to upload a new firmware for the TBolt before the
> 2017... that is download the actual firmware (3.00) correct the bias and
> upload the corrected one.
> 
> On Thu, Jun 7, 2012 at 10:48 PM, David McGaw <n1hac at alum.dartmouth.org>wrote:
> 
>> Not true.  GPS week is imbedded in the GPS data.
>> 
>> David
>> 
>> 
>> On 6/7/12 4:39 PM, Mark Sims wrote:
>> 
>>> Most GPS receivers base their rollover point from their data of
>>> manufacture/firmware creation/etc.   The week rolls over 1024 weeks after
>>> that.   They tend to not be dependent upon when the actual GPS week rolls
>>> over.  Better receivers have ways of inferring the actual week after a
>>> rollover occurs...  it appears that the Thunderbolt does not do this.
>>> Also,  most GPS receivers do not cease to work after a rollover...  they
>>> just report a bad date.
>>> 
>>> From the Thunderbolt manual:
>>> The first week number roll-over will occur as August 21, 1999 (GPS)
>>> transitions to August 22, 1999 (GPS). The ThunderBolt adjusts for this week
>>> rollover by adding 1024 to any week number reported by GPS which is less
>>> that week number 936 which began on December 14, 1997. With this technique,
>>> the ThunderBolt will provide an accurate translation of GPS week number and
>>> TOW to time and date until July 30, 2017.
>>> 
>>> _______________________________________________
>>> time-nuts mailing list -- time-nuts at febo.com
>>> To unsubscribe, go to
>>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>>> and follow the instructions there.
>>> 
>> 
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.