To me TMC stands for Technical Material Corporation. They made high quality HF receivers and transmitters for commercial and military use. How I date myself. Sigh! 73 de Glenn...VE4GN Andy AB9FX wrote: > >> >> "TMC" is a typo for "TNC" > > > Not quite, look at > http://www.tmcforum.com/en/about_tmc/what_is_tmc/what_is_tmc.htm