Jim Miller simple GPSDO modifications

[Bryan]

Hello:
I have been following the Jim Miller simple GSDO build project at http://www.jrmiller.demon.co.uk/projects/ministd/frqstd0.htm. I have a  few OCXO's kicking around, but wondering what would the formula be to provide the correct components for  R1,R2, C1, C2 to provide the PLL filter. I assume the PLL filter needs to be designed to accommodate a specific oscillator specifications, or maybe it doesn't really matter?. Also curious as to why in the parts list tantalums are spec'd for the capacitors in the filter?