[time-nuts] Tbolt issues

EWKehren at aol.com EWKehren at aol.com
Thu Sep 1 17:23:44 EDT 2016


maybe some one smarter than us can working with the parameters  that Tbolt 
makes available better performance can be achieved but it is a fact  that 
the frequency is being changed to compensate for time and Tom's frequency  
data matches our's and we do not care about ADEV, we care about the actual  
frequency at that moment it goes in to the measuring device and there is room  
for improvement if you are a frequency nut and are looking for ways to  
improve. Bob made a good point.
 
 
 
In a message dated 9/1/2016 4:27:02 P.M. Eastern Daylight Time,  
csteinmetz at yandex.com writes:

Tom  wrote:

> No, again it sounds like you have a bad TBolt. Or something  is wrong 
(antenna? reception? time constant? environment? China resoldered  parts?). I 
appreciate that Juerg did lots of testing -- do you happen to have  his ADEV 
plot?
>
> Your claim of 1e-10 is order(s) of magnitude  worse than the TBolts that 
I see. Something is wrong.

I second that  (not that any further evidence is necessary following 
Tom's comprehensive  response).  Additionally, as far as I know, the 
units Tom was testing  would have had the default tuning parameters (Tom, 
please comment).   Most Tbolts I've seen can be tuned for much better 
performance than this  at tau > 100 seconds, if they are equipped with a 
37265  OCXO.

Note that the Tbolt has tuning parameters that limit how far the  
frequency is allowed to wander to adjust the PPS phase -- if Bert's  
unit(s) have these parameters set to allow very fast PPS recovery, that  
could well cause the behavior he describes.

You should also check  all of the other tuning parameters to see if there 
are errors in the  settings.

However, rather than mucking about in the myriad tuning  settings 
starting where they are now, I recommend doing a full factory  reset to 
get all parameters back to the original settings.  Then  (after several 
weeks of undisturbed running), compare ADEV performance  with Tom's graphs.

Best  regards,

Charles


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