[time-nuts] Tymserve 2100 thinks it's 1995?

Azelio Boriani azelio.boriani at gmail.com
Mon May 4 12:09:18 EDT 2015


This is a known problem for old GPS receivers, refer to this URL:
<http://www.leapsecond.com/notes/gpswnro.htm>
to learn more or search the Internet with the words "GPS week number rollover".

On Mon, May 4, 2015 at 12:43 PM, Chris Mottram <C.Mottram at ljmu.ac.uk> wrote:
> Hi Bob, I've just this minute joined this list, because I Tymserve 2100 unit
> we have at work has just started doing the same thing, at just gone 1am UT
> on May  3rd. I've also tried restarting and power cycling (this is somewhat
> convoluted as the unit is ~3000 miles away from me) but it's firmly stuck in
> 1995
>
> Ours is currently running Rev 3.1 :
> 5 ? version
> Boot Code - Tymserve_2100
>   Rev 1.1   12/20/1996 13:07:21
> Main Code - TymServe_2100
>   Rev 3.1   08/22/2002 12:15:37
>
> After a power cycle, our unit comes up as follows:
> 3 ? time
> JAN 01 1995 00:01:53.687252
> After the GPS has locked this changes to:
> 5 ? time
> SEP 17 1995 20:14:35.479915
> Where 20:14 was the correct UT time.
>
> cheers
>
> Chris
>
>
> On 05/04/2015 12:31 AM, Bob Martin wrote:
>>
>> My Tymserve 2100 gps unit (Rev 4.1) thinks it's 1995 -- September 17,
>> 1995.
>>
>> But a restart (connect via telnet and give the commands util restart)
>> brings it back to the correct time and date -- for a while? I haven't caught
>> it dropping back, so i don't know if it's doing this on the hour, after an
>> hour, or what, but I noticed it last night, and I've restarted it a few
>> times today.
>>
>> Any clues?
>>
>> I know about the off-by-a-second issue with the pending leap second. This
>> one is more interesting!
>>
>> So far I've just been issuing software restarts. The next time I'll power
>> cycle the sucker and see if that does any good.
>>
>> GPS signal isn't the issue; the 2100 shares an external GPS antenna with
>> my Thunderbolts through a Symmetricom 58536A GPS splitter, and the
>> Thunderbolts are as happy as a Thunderbolt can be.
>>
>> cheers
>>
>> bob k6rtm
>>
>>
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>>
>
>
> --
> -----------------------------------------------------------------------------
>  Chris Mottram                          |
>  Liverpool Telescope Programmer.        |
>  Liverpool John Moores University,      | email: C.Mottram at ljmu.ac.uk
>  Astrophysics Research Institute,       | phone: (0151) 904 6591
>  IC2, Liverpool Science Park,           | mobile: 07778650412
>  146 Brownlow Hill, Liverpool, L3 5RF   | www:   www.astro.ljmu.ac.uk
> ------------------------------------------------------------------------------
>
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