On 24/01/14 11:59, Morris Odell wrote:
Hi all,
There was some consternation here 5 months ago when Z3815A GPSDOs began
reporting a date 1024 weeks in the past. This was due to a storage overflow
condition in the Furuno GPS receiver in the Z3915A. The designers probably
never anticipated that they would still be in use 20 years later....
Oscillator discipline was unaffected as the 1 pps was still good.
It's kind of expected that the oscillator discipline works, because all
what has happen is that the conversion from GPS time to normal time
(being GPS or UTC) has been unable to unwrap the GPS week number
properly. It's really a problem with the system than with the receiver.
Obsessional types like me looked for a solution. There didn't seem to be any
knowledge out there about reprogramming the receivers so it had to be a
transplant.
Interesting approach. There is two things one can do: Toss in a small
PIC/AVR/whatever that modifies the time, or update to a receiver which
does not have the issue. You can also just completely ignore the fact :)
Cheers,
Magnus
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