[time-nuts] Z3801A gps week rollover

Bob Camp kb8tq at n1k.org
Thu Sep 8 17:21:22 EDT 2016


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.


> On Sep 8, 2016, at 4:34 PM, Peter Vince <petervince1952 at 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
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