[time-nuts] Trimble Nortel GPSTM Boards
GandalfG8 at aol.com
GandalfG8 at aol.com
Mon Aug 5 20:06:27 EDT 2013
Many thanks to those who commented on this and apologies for the delayed
response, having spent a few days in an internet free zone I've also had to
contend with a couple of power failures since returning but am just about
getting back to normal again, whatever normal might be:-)
As suggested, changing the elevation mask does make a difference to the DAC
voltage jumps, I'd just run up Lady Heather on default settings to start
with which sets it to 10 degrees and changing that to 20 degrees, for
example, has reduced the steps in the DAC voltage as sats come and go, they're
still there but not so pronounced.
Having said that, comparing this with a Thunderbolt, albeit using another
Thunderbolt as the reference for both, does tend to give more pronounced
steps on the Thunderbolt for the same elevation mask and sensitivity settings.
As others have commented previously I'm also noticing the much reduced
temperature sensitivity of this unit compared with the Thunderbolt which is
quite a big plus, but it's not all totally one sided, both Lady Heather and a
couple of Pendulum counters are showing somewhat lower Adev values for the
Thunderbolt although the plots of frequency against time show very similar
Either way, so far at least this does seem to be working well. I still
haven't heard from anyone who's run the two available GPSTM variants side by
side so I'm still debating whether or not to try that for myself, or whether
to just quit whilst I'm ahead:-)
In a message dated 31/07/2013 22:48:13 GMT Daylight Time, GandalfG8 at aol.com
Having stuck a late bid on a recent auction for what I'd assumed was a
Trimble Nortel NTGS50AA I then realised I'd just bought the single board
version, part number 4500-00-CH with the Trimble 49422-CR OCXO.
That in itself wasn't a problem, except perhaps the doubts cast over my
sanity:-), it arrived earlier today and has been running for several
now, chatting comfortably with Lady Heather, and generally settling in
However, it does prompt the question, has anyone had a chance to compare
one of these side by side with an NTGS50AA and, if so, were there any
obvious differences in performance?
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