[time-nuts] GPS week wrap in HP Z3801A

Hal Murray hmurray at megapathdsl.net
Mon Dec 26 18:28:12 EST 2011


> IIRC the GPSs in the Z3801As are Oncore VPs. They don't suffer from the  GPS
> week rollover, but If the RTC in the receiver is not set or its  battery has
> failed, and the reference year stored in EEPROM is also  wrong, the receiver
> may select the wrong 20-year window. This may be  fixed by entering a date
> command when the receiver is not tracking  satellites. 

Thanks.

I told the Z3801A the date using ":GPS:INIT:DATE 2011,12,26"
That jumped to 2007 rather than 2011.  After it found some satellites it came 
up with the right date.


> send the receiver
> /@@Cj
> and you will get the revision data. 

I'm talking to the Z3801A rather than the GPS unit.  I was looking for a way 
to get the build info for the Z3801A.


The Z3801A has a command (:diag:iden:gps?) that returns a lot of info about 
the GPS unit.

My two samples say:

"COPYRIGHT 1991-1995 MOTOROLA INC."
"SFTW P/N # 98-P39972M     "
"SOFTWARE VER # 8          "
"SOFTWARE REV # 4          "
"SOFTWARE DATE  13 JUL 1995"
"MODEL #    XXXXXXXXXXXXXXX"
"HDWR P/N # XXXXXXXXXXXXXXX"
"SERIAL #   XXXXXXXXXXXXXXX"
"MANUFACTUR DATE XXXXXXXXXX"
"OPTIONS LIST    IBC       "


"COPYRIGHT 1991-1995 MOTOROLA INC."
"SFTW P/N # 98-P39972M     "
"SOFTWARE VER # 8          "
"SOFTWARE REV # 4          "
"SOFTWARE DATE  13 JUL 1995"
"MODEL #    B1121P1114     "
"HDWR P/N # _              "
"SERIAL #   SSG0288302     "
"MANUFACTUR DATE 8F19      "
"OPTIONS LIST    IB        "



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