On Wed, Oct 17, 2012 at 10:42 AM, Harold Hallikainen wrote: > > > 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 > > And I see minicircuits makes many varieties. Thanks! - Martin K --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .