[time-nuts] Trimble Nortel GPSTM Boards

[Jim Sanford]

Did you /increase/ the elevation mask?
Jim
wb4gcs at amsat.org

On 8/5/2013 8:06 PM, GandalfG8 at aol.com wrote:
> 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
> limits.
>   
> 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:-)
>   
> Regards
>   
> Nigel
> GM8PZR
>   
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> In a message dated 31/07/2013 22:48:13 GMT Daylight Time, GandalfG8 at aol.com
>   writes:
>
> 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
> hours
> now, chatting comfortably with  Lady  Heather, and generally settling in
> nicely.
>
> 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?
>
> Regards
>
> Nigel
> GM8PZR
>
>
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