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

The gps rcvr does not have a batter but will indeed support an external battery. 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@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 > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. >