Paul, W1GHZ has put together a simple doubler for the 5 MHz OCXO in the Lucent boxes. It's based on a Minicircuits part with MIMIC amp. Details here: http://users.burlingtontelecom.net/~n1jez@burlingtontelecom.net/images/Simple_Frequency_Doubler.pdf Mike -- 73, Mike, N1JEZ "A closed mouth gathers no feet"