[time-nuts] Z3801A gps week rollover

Mark Sims holrum at hotmail.com
Fri Sep 9 00:51:35 EDT 2016

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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