[time-nuts] Z3801A gps week rollover

paul swed paulswedb at gmail.com
Fri Sep 9 16:09:40 EDT 2016

The gps rcvr does not have a batter but will indeed support an external
I attached 2 AA batteries in a external easily replaceable holder and ran
the 2 wires to the receiver 10 pin plug. (At least I think it was 10)
I change the batteries every 2 years not so much for voltage as concern for
leakage. Then use the old battery in my wireless mouse.

On Fri, Sep 9, 2016 at 12:51 AM, Mark Sims <holrum at hotmail.com> wrote:

> The Z3801A status page takes 3 seconds to process/send.  Not surprising
> that the time is a bit off.  Lady Heather only requests the SYST:STAT
> message once per minute (at hh:mm:33 seconds) because it blocks the unit
> from doing anything else while it is handling it.  The main things
> extracted from the status screen are the satellite positions and signal
> levels.
> The Z3801A T1/T2 message times are correct.  The end of the message that
> sends the T2 time arrives around 20 msecs before the 1PPS pulse.
> I don't see a battery anywhere... there might be a capacitor, but, if so,
> it is not a large super-cap type unit.
> --------------
> >  There seem to be two internal versions of time
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