[time-nuts] RFTGm-II-Rb - can you gps discipline it without the XO module?

[Bob Camp]

Hi

So your Rb is 0.71 ppb off frequency. 

That's far enough that's it's worth adjusting. You should be able to get it 10X better than that without a lot of work.

Bob


On Aug 15, 2013, at 6:02 PM, Alan Kamrowski II <alank2 at earthlink.net> wrote:

> Hi Rex,
> 
>> I don't think the rubidium module for these systems can be disciplined. 
>> I think they were only intended as a backup if the XO section or GPS
> failed. 
>> The XO section does discipline but I don't know the details.
> 
> I was hoping since the rubidium module had a light for GPS and an input for
> the GPS that it also did the same thing.
> 
>> Trying to trace out some of the circuits, I found that the EFC on the 
>> LPRO connector was not being used at all.
> 
> That is too bad, but that proves it all right.
> 
> I tried to feed a 1pps signal into the interface pin 9 to see what would
> happen, but the NO GPS light never went off and it didn't pull the frequency
> at all.
> 
> So far I've done a 4 hour run between the Rb and GPS and counted
> 139390000010 Rb cycles to 13939 GPS 1pps pulses or 10000000.0007174 Hz for
> the Rb.
> 
> Thanks,
> 
> Alan
> 
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