Charles Harpole wrote: > I see that now Elecraft is offering sale of a Heil K2 Pro Set > mic/headphone unit, saying it is "optimized for K2." I assume that > also means K3. Charles brings up a good point. What is it that makes any microphone "optimized" for any radio. Pin outs are obvious of course. - Impedance? - Bandwidth? - Signal Strength? John