[time-nuts] Input stage for time interval counter

[hans-georg at lehnard.de]

Hi all, 

I am currently working on a 2 channel time interval counter. It should
measure frequencies from 5 to 20 MHz. And hopefully have a resolution
about 1E-13 at 0,1s to measure HP10811 OCXO stability.   

For inputs should I use  UNBAL Rf transformers 1:4 (1:16) or drive the
LTC9657 directly. 

Thanks for your suggestions 

hgl