On Sep 2, 2016, at 4:32 AM, Jim Brown wrote: On Fri,9/2/2016 1:09 AM, Jim Thomson wrote: > Commercial world doesnt use type N anymore. The "commercial world" doesn't work at MF or HF. :) Think again... Look up Micom, Mobat, and Harris, and remind me of all the HF systems I installed, around the world.