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

Magnus Danielson magnus at rubidium.dyndns.org
Wed Aug 2 20:17:18 EDT 2017

It should only be the failure of producing the wrong "display-date".
The internal time system use different gears for everything, so the 
display-date is a side-product. Adjust with +1024 weeks and you should 
be all set. Leap-second info work on internal gears.


On 07/28/2017 02:36 AM, paul swed wrote:
> Well quite an unpleasant surprise. So after the 30th do the TBolts stop
> working or is it a case of just the wrong date? I know my Hp3801s been
> working just fine and its old. Is the TBolt the same issue. Wrong date but
> still locks thats all I care about actually.
> With to respect of some sort of a hack I can see that being fairly
> difficult.
> Regards
> Paul
> On Thu, Jul 27, 2017 at 8:01 PM, Attila Kinali <attila at kinali.ch> wrote:
>> On Thu, 27 Jul 2017 17:49:14 -0500
>> Didier Juges <shalimr9 at gmail.com> wrote:
>>> I cannot imagine a work around since the problem stems from the GPS
>> service
>>> only identifying the current date within a particular 1024 weeks epoch
>>> unless the government changes the amount of data that is sent over the
>> GPS
>>> system. Somebody has to use other method to determine the epoch and add
>> the
>>> corresponding offset.
>> There is: There is a 13bit week number in message type 10. This gives
>> a 157 year span instead of the ~19 years of the 10bit week number.
>> This has been part of the GPS standard since IS-GPS-200D which was
>> released in 2004. As such I am a little bit surprised that the u-blox
>> receivers still don't support this message (the LEA-5 family was released
>> in 2007 IIRC). But you can use the UBX RXM-SFRBX  messages to get the
>> raw GPS messages and decode them yourself.
>>                                 Attila Kinali
>> --
>> You know, the very powerful and the very stupid have one thing in common.
>> They don't alters their views to fit the facts, they alter the facts to
>> fit the views, which can be uncomfortable if you happen to be one of the
>> facts that needs altering.  -- The Doctor
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