Want to design a custom interface to the DB20-G through the mic jack. Unless I'm missing it, there is no schematic to the microphone although I've seen several RJ-45 (8P8C) pinouts that I have not been able to prove. I know a DB20-G is very similar to Anytone AT-778UV. Appears to be no schematics/maintenance manuals for either radio. Anyone have any leads or links to the docs?
Thanks.
Bill