Hi, I would like to know about the myGMRS SD card and using a Rpi as a repeater controller. (I am currently using the ID-O-Matic IV with 2 GM300 Radios, a Harris 6 Cavity Duplexer, 400Max Coax to a Tram 1486 Antenna @ 40'. But I have been having issues with the Controller and I have sent it back...