[time-nuts] Week Number Rollover: Ashtech Z12

[John Ackermann N8UR]

I was running my newly-acquired Z12 (with 1999 firmware) overnight, 
capturing RINEX data via Lady Heather, using Cesium reference.

This morning Lady Heather showed the receiver still tracking satellites 
and giving time, but the lat/long/elevation were frozen -- lat and long 
were correct, but elevation showed -821 meters!  The receiver's own 
display showed the same thing -- "99999" as the measurement count, GMT 
time incrementing, unchanging lat/long/elevation, -821 meters.

I had to do a complete reset (wipe internal memory) to get the receiver 
working again, but now it seems to be tracking normally.

I sent the RINEX file off to NRCan and it will be interesting to see 
what the results look like.  If anyone is interested, the raw file is 
available for study.

John