[time-nuts] Stuck Z3801A

[Hal Murray]

My Z3801A lost contact with the GPS world: no satellites.  It was in holdover 
for several days before I investigated.  I poked around but didn't find 
anything.  It recovered after I cycled power.

Has anybody seen anything like this?  Or know what's going on?  What should I 
look for if it happens again?

It's been running over 5 years.  My antenna is in a poor position so my setup 
is good at tickling a large set of weird bugs.  I may have seen something 
like this before but I'm not sure.


Here is a status page before power cycling:

SYNCHRONIZATION ............................ [ Outputs Valid/Reduced Accuracy 
]
SmartClock Mode ___________________________   Reference Outputs 
_______________
   Locked to                                  TFOM     5             FFOM     
2    Recovery                                   1PPS TI -110.7043 us rel to 
GPS
>> Holdover: GPS 1PPS CLK invalid             HOLD THR 1.000 us
   Power-up                                   Holdover Uncertainty 
____________
                                              Predict  11.6 us/initial 24 hrs
                 Holdover Duration: 28h 22m   Present  16.2 us
ACQUISITION .......................................... [ GPS 1PPS CLK Invalid 
]
Satellite Status __________________________   Time 
____________________________
Tracking: 0        Not Tracking: 8            UTC      21:31:48     23 Sep 
2009
                    PRN  El  Az  PRN  El  Az   1PPS CLK Invalid: not tracking
                   * 2  29 177  *27  62 284   ANT DLY  10 ns
                   * 4  48 144  *28  23  92   Position 
________________________
                    * 9  54 299                MODE     Hold
                    12  22 297
                    15  12 224                LAT      N  37:26:05.188
                   *17  47  44                LON      W 122:12:16.074
ELEV MASK 10 deg   *attempting to track       HGT               +45.89 m  
(MSL)
HEALTH MONITOR ......................................................... [ OK 
]
Self Test: OK    Int Pwr: OK   Oven Pwr: OK   OCXO: OK   EFC: OK   GPS Rcv: OK


-- 
These are my opinions, not necessarily my employer's.  I hate spam.