[time-nuts] Trimble Thunderbolt EOL

SAIDJACK at aol.com SAIDJACK at aol.com
Mon May 19 04:42:16 EDT 2008

Hi Tom,
Not sure if Pb-free is the only change.
We received feedback from someone that is evaluating the Fury GPSDO to  
replace the EOL Thunderbolt GPSDO in their application.
They looked at the T-Bolt, T-Bolt-E, Mini-T, and Fury (the single  oven, 
AT-cut, low-cost version - the double-oven Fury option would have  performed 
better). Here are some abbreviated comments:
With the announcement of the end of life for the Thunderbolt we have  
evaluated the Thunderbolt E, the  Mini-T and now the Jackson Labs Technologies  Fury 
as candidate replacements. Unfortunately none of them look to be suitable 
although there  is an indication that the Fury is not  far off...  It appears that 
when both  the Fury and the Thunderbolt E are at their best they are on a par 
with the Thunderbolt...
They compared Phase Noise performance as well as stability.
If the Thunderbolt-E is really just a Pb free version, then it may be  
unit-to-unit tolerance that is making the E perform worse than the original  
reference unit. Or Trimble may have resorted to a lesser OCXO to save cost  and meet 
RoHS requirements.
BTW, I wonder how the RoHS high-temp soldering requirements affect OCXO's,  
since the soldering temp now has to be significantly higher (to the point where 
 non RoHS connectors can actually melt for example). In my opinion this can 
have  significant negative impact on the Crystal etc, besides all the long-term 
 reliability issues with Tin Whiskers..
In a message dated 5/18/2008 20:46:33 Pacific Daylight Time,  
tvb at LeapSecond.com writes:

> It  seems the T-Bolt is being replaced with a newer version. I wonder
>  which ones we will be getting ??
>  http://trl.trimble.com/docushare/dsweb/Get/Document-383748/TBolt%20EOL.pdf 

We got late models from 2005+/-. It seems the newest ones
(E  suffix) are ROHS compliant. Other than the lead, I can't
see a difference;  does anyone know for  sure?


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