[time-nuts] Thunderbolt GPS rollover
lists at rtty.us
Thu Jun 7 22:42:44 UTC 2012
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.
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.
>> 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.
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