Technique used in the very early days for some of the first voice and music transmissions.... Dennis D. W7QHO Glendale, CA ************* On Mar 15, 2013, at 3:50 PM, Rob Atkinson wrote: > you can put a carbon mic in series between the rig and antenna and > use it to modulate the RF. Supposed to work but sounds really bad. > Only a few watts I guess.