[time-nuts] Disciplining Rubidium

[iovane at inwind.it]

Does it make any sense "GPS disciplining" a rubidium oscillator?
In such a case we have a chain made of
GPS - Rubidium - XTAL
as opposed to the simpler case of 
GPS - XTAL
(assume that XTALs are of the same quality, and so the control loops).
Does the addition of Rb in the middle of the chain add 
any real advantages?

Antonio I8IOV