I believe I've found a difference between the faulty units and the
working units... The faulty ones come up as 1/1/1997 when you do
:SYSTEM:PRESET, the good ones come up as 1/1/1998. Does this difference
ring any bells for anyone?
Matthew Kaufman
On 6/24/2010 8:41 AM, Matthew Kaufman wrote:
I now have *two* Z3801A units which misbehave in the following way
(which this thread reminded me of):
The GPS status says it acquires quite a few (5-6) satellites with high
signal strength... then after a minute or two, for no apparent reason,
it loses *all* of them simultaneously but immediately goes back into
"acquiring" for the ones it was seeing, and a few seconds later,
they're all back. During this time, survey (if in progress) is halted
and then restarts and runs for a bit before halting again when it
loses everything briefly again. Then, within days, the unit ends up
out of lock... if I go check it, I see it doing the same thing, and
when the satellites are being received it is in "fine frequency
adjust" mode, but so far off the 1pps phase that it really has no hope
of re-locking before the next time it drops and then reacquires all
the satellites.
This is independent of antenna, location, and 48v power source... one
unit apparently has been this way since I got it, the other worked
fine for months and then developed this problem.
Without knowing more, I'm thinking it might simply be a bad GPS
receiver board, thus the idea of trying to find a replacement, perhaps
one that is better at staying acquired, has crossed my mind.
Matthew Kaufman
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