Specifications:Setting For Pi-star software and raspberry hardware (rpi 0-3) new pi4b need remove Right SocketPi-star General Configuration for MMDVM_DUPLEXSet Controller Mode:Duplex Repeater or SimpleRadio Frequency : Freq:144-148,219-225,(Main Band)420-475,842-950Duplex Mode:Example:RX:438.000000 ..