[Boatanchors] SP600 and DDS?

[Eugene Hertz]

I was reading the december issue of ER and read an interesting article about injecting a DDS signal into a crystal socket for a Drake 4C.  So I was wondering if anyone ever tried/thought of doing the same thing with an SP600? Would seem a logical idea. Would give high stability and direct frequency readout (assuming you built the readout circuitry).

Thoughts anyone?
Eugene