[time-nuts] Thunderbolt GPS rollover

Bob Camp lists at rtty.us
Thu Jun 7 23:26:21 UTC 2012


Hi

Anything that Lady Heather displays does indeed come from the TBolt and is then interpreted by the software. My point is that none of us really use the TBolt serial output directly. It's not like an IRIG or SMTPE box. 

Bob


On Jun 7, 2012, at 6:52 PM, Azelio Boriani wrote:

> OK, I can write software but the TBolt has the TSIP protocol in addition to
> the 10MHz and PPS. LadyHeather is usually used by TimeNuts as TBolt monitor
> so the modification must be done in LH. Moreover I think that there is a
> TSIP packet with time and date...
> 
> On Fri, Jun 8, 2012 at 12:42 AM, Bob Camp <lists at rtty.us> wrote:
> 
>> 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.
>> 
>> 
>> _______________________________________________
>> 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.





More information about the Time-nuts_lists.febo.com mailing list