[time-nuts] TrueTime/Symmetricon XL-AK date reset failure

"Björn Gabrielsson" bg at lysator.liu.se
Mon Jan 2 19:11:15 EST 2017


Hi again Joe,

Yesterday was 2 Jan. Which was GPS week:day 1930:2. Walk back 1024 weeks
and we are in 906:2. Monday in GPS week 906 was May 19th 1997. And that
was also the 139th day in 1997. And I think we can confirm the cause of
your problem.

How to fix it... the GPS receiver module beeing 20+ years old is unlikely
to have a firmware update. But try to identify the model and maybe there
is a more modern receiver module that works in your box. Another option
could be modifying the XL-AK box firmware to add 1024 weeks to the date.

The good thing is that its only the date that is computed wrońg.
Position and time-of-day, 1pps etc are all working as good as before.

--

     Björn


> On 1/1/2016, I noticed that the day
> counter display did not automatically reset to zero, and start over. The
> day
> counter display continued increasing incrementally, until 139 days ago, it
> finally reset itself to zero and started incrementally increasing again
> from
> [day] 1. Which means that the day-of-the-year counter function currently
> reads "139," when it should read "2." The time display has always remained
> accurate. I had hoped the day counter issue would resolve itself at
> midnight
> on 1/1/2017; but nothing changed.
>
>
>
> I know that the TrueTime/Symmetricon XL-AK and XL-DC GPS receivers are
> popular, and now that I have discovered this forum; I would like to
> solicit
> feedback as to what the root of the problem is and how to remedy it, from
> anyone on the forum having personal experience with this line of GPS
> receivers. Ideas???
>
>
>
> Thanks de Joe-W6VI
>
>
>
>
>
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