40 miles, from a high level comm site to/from my house at a very RF-
quiet elevated location. Interference is very unlikely.
Matthew Kaufman
(Sent from my iPhone)
On Jun 24, 2010, at 9:08 AM, "Robert Benward" <rbenw...@verizon.net>
wrote:
When you say you changed location, are we speaking of moving the
antenna to the other side of the roof, or across town? Sounds
suspciously like interference.
Bob
----- Original Message ----- From: "Matthew Kaufman" <matt...@matthew.at
>
To: "Discussion of precise time and frequency measurement" <time-nuts@febo.com
>
Sent: Thursday, June 24, 2010 11:41 AM
Subject: Re: [time-nuts] Substitute GPS in a Z3801A
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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