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

Alan Kamrowski II alank2 at earthlink.net
Thu Aug 15 18:02:26 EDT 2013


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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