Yes, rollovers should not be a problem and should only affect the date display. However, I have seen devices/software that use GPS fail to work because of what appears to be an invalid date. It seems that they are validating the data from the receiver and if, for instance, the date is before when the device was made or software was written assumes the GPS has failed. I don't know of any GPSDO's that fail to work, but I do know of systems that use them that fail because of the rollover.

Can I just ask why the Z3801As are having week roll-over problems now - I didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th of April 2019? Peter

Hi After the first batch of GPS devices rolled over, the manufacturers came up with a “fix” for the problem. If the date came out to a number *before* the firmware was issued, it was corrected forward in time. This only works over a single span of GPS dates. Depending on when the firmware you have was issued, the failure can occur at any time. Bob > On Sep 8, 2016, at 4:34 PM, Peter Vince <petervince1952@gmail.com> wrote: > > Can I just ask why the Z3801As are having week roll-over problems now - I > didn't think it was 2048 weeks since GPS "zero-hour" until late on the 6th > of April 2019? > > Peter > _______________________________________________ > 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.