[time-nuts] Do time nuts only use and measure 10MHz clocks?

[Erik Kaashoek]

In a DMTD one can use one clock send to both mixer for measuring very 
accurately  the frequency/phase difference of two clocks at roughly the 
same frequency.
One can also imagine having two different clocks derived from the same 
reference, one for each mixer, enabling the measurement of two very 
difference clocks (such as 10MHz and 1, 5 or 100MHz) with hopefully 
equal accuracy and without having to use external dividers.
Is this for time nuts a relevant use case?
If yes, what other frequencies besides 10MHz (and 1PPS) are used?
Erik.