[Elecraft] K3 External Reference Locking Progress?

[G3XDY]

Some months back Wayne posted details of how the external reference locking 
would work for the K3, and I recollect that field test was imminent. Since 
then it has been very quiet.  Having just finished GPS locking my 23cm 
transverter it would be nice to get the K3 tied into the system too.

Does anyone know of  progress on this option?

73

John G3XDY
K3 #689