OIP3 Measurement Bench

Hi,

I am trying to organize my spectrum analyzer to measure OIP3, let s say for 900 MHz.
I know more a less what is required, two signal generators, two isolators, one power combiner and a LPF. (plus some attenuators)

Can somebody, with some experience on this, suggest manufacturers (ideally with part numbers) for the Isolators and combiners?

I know for the LPF, Minicircuits could be good.

Thx

http://www.ainfoinc.com/en/p_mwrf_iso.asp

http://www.nardamicrowave.com/east/i...categoryId=312