[time-nuts] Thunderbolt GPS rollover

paul swed paulswedb at gmail.com
Wed Jun 6 22:44:36 EDT 2012


Well there are far better experts then me.
I can only say that an austron 2201 works very well and shouldn't. They
were supposed to die in 1998 I believe. Essentially you put the date into
it 1024 weeks ago and it does a very nice job of finding satellites,
location, and establishing an accurate frequency.
So I would guess the tbolts would do the same but I will bet the experts do
know.
If they do not I can sell you one real cheap. :-) Then stick with the old
2201.
Regards
Paul
WB8TSL

On Wed, Jun 6, 2012 at 10:33 PM, Robert Watzlavick <rocket at watzlavick.com>wrote:

> Sorry to resurrect an old thread but I also have a question about using
> the Thunderbolt in the future.  I'm considering using 4 of them in a
> multilateration setup to track an amateur rocket with an onboard beacon.
>  I'm a few years away from the flight so I don't want to invest in hardware
> that may not work.  It doesn't matter if the date (or even the absolute
> time) is wrong as I'll just be measuring the delta time between reception
> of the beacon and each unit's 1 PPS output.  However, accurate position
> data would be required.  I would also need the 10 MHz to be usable to drive
> the counter measuring the delta time.
>
> Will the unit still "work" but just put out the wrong date?  Or will it
> effectively turn into a brick?
>
> Thanks,
> -Bob
>
> On 10/19/2011 08:06 PM, Thomas S. Knutsen wrote:
>
>> I do assume this is because of the 1024 week cycle? if so would it be
>> possible to tell the GPS what  cycle it should be?
>>
>> Would the 10MHz out still be accurate?
>>
>> BR. Thomas.
>>
>> 2011/10/20 Mark Sims<holrum at hotmail.com>:
>>
>>> On July 30,  2017 all our Thunderbolts turn into back-dated pumpkins...
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>>
>
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