> I'm looking for an opamp adder in an eval board or "black box" that I
> can use to add (not mix) two RF signals of between about 80 and 150
> MHz.
>
> I know I could build one using any number of available opamps but I'm
> looking for a proven design that I don't have to analyze/verify
> myself.
>
> Thanks.
> -
> Martin K

Not an op-amp circuit, but how about a cable television "splitter" in
reverse? Drive each of the "output" ports with an RF source with a 75 ohm
source impedance. Load the "input" port with 75 ohms. You should get a
scaled sum of the two signals with a fair amount of isolation between the
two sources.

Good luck!

Harold



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