[time-nuts] time-nuts Digest, Vol 121, Issue 65

Dave M dgminala at mediacombb.net
Sat Aug 23 17:51:06 EDT 2014


Thanks for that suggestion, Ed.  After a bit of reading in the X72 Reference 
Guide, it appears that the X72 does have a 1PPS input.  That would be 
considerably easier than trying to interface the Rb into the GPSDO.  Still 
trying to understand what the manual is telling me. Next thing is to 
determine if my unit has that option enabled (firmware option).  That will 
be a chore for after the holiday... really busy next week.

What would that (1PPS disciplining) do for me... in terms of maintaining the 
Rb frequency accurately set?  Would it be as accurate as having the Rb 
disciplined via the EFC input?

Thanks,
Dave M


> Message: 5
> Date: Fri, 22 Aug 2014 16:19:45 -0600
> From: Ed Palmer <ed_palmer at sasktel.net>
> To: Discussion of precise time and frequency measurement
> <time-nuts at febo.com>
> Subject: Re: [time-nuts] EFC info on Trimble 34310-T OXCO
> Message-ID: <53F7C201.5070206 at sasktel.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Have you checked your X72 to see if it has the 1 PPS discipline
> option?
> That would be a lot easier (and probably better) than your proposed
> transplant.
>
> Ed
>
> On 8/22/2014 12:39 PM, Dave M 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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