[time-nuts] GPS week wrap in HP Z3801A

Hal Murray hmurray at megapathdsl.net
Mon Dec 26 15:31:52 EST 2011

I turned on a Z3801 that had been idle for a while.  The status screen said:
  UTC      20:03:44 [?] 11 May 1992

That looks like 1024 weeks (19.7 years) ago.

When I first turned it on, before finding any satellites, it said:
  UTC      12:05:00 [?] 01 Jan 1992

Has anybody else noticed troubles like this?

I've got another one that still works.  It's got a bigger serial number so I 
assume it's more recent.

Does anybody know how to read the firmware date or version?  There is a 
command to get info from the GPS unit, but I haven't found a way to get any 
info for the main firmware.

After a while, the "[?]" goes away.

These are my opinions, not necessarily my employer's.  I hate spam.

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