[time-nuts] EFC info on Trimble 34310-T OXCO

[Bob Camp]

Hi

All of the OCXO’s in the GPSDO’s pull 100’s (or more) times the pull of a Rb. The firmware that they have on that board for the OCXO is going to need some serious tweaks to get it to work properly with an Rb. The GPSTM is not as tweak friendly (no filter changes allowed) as some of the other GPSDO’s.

Bob

On Aug 22, 2014, at 2:39 PM, Dave M <dgminala at mediacombb.net> wrote:

> Does anyone have any info on the OXCO in the Nortel/Trimble NTBW50AA-17 
> GPSTM receiver?  The OXCO is labeled as Trimble 34310-T.  I see some Trimble 
> 34310-T oscillators on Ebay with pinouts labeled, but no other info.
> 
> Specifically, I'd like to know the EFC characteristics for it.  I'm thinking 
> of the possibility of pulling the OXCO out of the GPSTM and subbing in a 10 
> MHz Rubidium, and using the GPSTM to discipline the Rubidium.  My Rubidium 
> is a Symmetricom X72, recently purchased.  It seems to be working well.
> Does anyone know the differences between the three OXCOs used in the GPSTM 
> receivers ("T", "T2" and "Oak")?
> 
> Thanks for some insight,
> Dave M 
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