[time-nuts] GPS week wrap in HP Z3801A
Hal Murray
hmurray at megapathdsl.net
Mon Dec 26 23:28:12 UTC 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 "
--
These are my opinions, not necessarily my employer's. I hate spam.
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