[time-nuts] BC637PCI 1024 week rollover
GandalfG8 at aol.com
GandalfG8 at aol.com
Sun Feb 9 06:56:50 EST 2014
Oh well, full credit to Mr Trimble for getting it right, he does bake
exceedingly nice GPS modules and the Ace3 doesn't have a rollover issue and it
does report the date correctly.
Unfortunately, as far as I can tell anyway, the BC637PCI takes the raw GPS
time data from the Ace3 and performs its own calculation which is where the
problem seems to occur, certainly it's a 1024 week issue with the date
from the BC637 being displayed as June 26 1994 in all versions of the
associated demo software.
It is possible to set the date correctly but the next packet from the GPS
module promptly overwrites it again.
I still don't recall seeing this before, although with two boards behaving
in the same fashion I'm having doubts about that, but more to the point
these boards indicate a firmware date of 2003 which implies they were put
into the field like this, and that doesn't make much sense either.
Any ideas anyone?, and again has anyone else seen this and/or am I missing
something glaringly obvious?
Regards
Nigel
GM8PZR
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