mixer design

Hi

I'm working on project in which I need a mixer,I want it work with a 600 ohm output Impedance of function generator. and I want its output to be about 3-4 MHZ.what is very important for me is that I don't want IC and wnat it to be cost efficient(preferbly with jfet or bjt).

I suggest you give far more details! - it's pretty vague at the moment.