[time-nuts] Trimble Nortel GPSTM Boards

[GandalfG8 at aol.com]

Hi Jim,
 
Yes I did, no value was perfect in this respect, ie as affecting the  DAC 
steps, so settled on 20 as a bit of a compromise. The number of sats being  
tracked still seems to be a factor in the equation, setting an elevation 
angle  of 20 degrees had quite a smoothing effect last night, today I'm back to 
much  more noticeable steps again.
 
Although I have used Lady Heather in the past I've tended rather to stick  
with Trimbles own more simplistic software for making basic  adjustments and 
just to ensure things are set up and working ok, so  I'm back on a fairly 
steep learning curve and perhaps being given too  much information for my own 
good:-)
 
Regards
 
Nigel
GM8PZR
 
 
In a message dated 06/08/2013 01:15:17 GMT Daylight Time, wb4gcs at wb4gcs.org 
 writes:

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
>    
>   
>   
>    
>   
>   
>    
>   
> 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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