Open Source Multi Mode Digital Modem

Open Source Multi Mode Digital Modem Description

This MMDVM digital voice modem is an open-source hardware and software solution for amateur radio enthusiasts. It supports multiple digital voice modes, including DMR and D-Star, with upcoming support for System Fusion and P.25. The board must be used with a compatible ARM-based development board like Raspberry Pi or Orange Pi. It has been tested with repeaters such as GM300, GM3188, 3688, 950I, 338, and Vitex DR-1X, but other models may require custom adaptation. The modem features a built-in FM repeater controller and operates in simplex or duplex mode for most modes, except DMR and FM where full duplex is required. This board is not suitable for Raspberry Pi 3B+ or Nextion LCD displays. The set includes the relay board, a Moto cable, two adapters, and a manual.