Features:
1. This product MMDVM is designed to be an open source multi-mode digital voice modem, which utilizes the functions of an ARM processor and a simple analog interface board.
2. The multi-mode digital voice modem is a combination of hardware and software development of the modem, which can handle all amateur digital voice modes.
3. Initially it will support D-Star and DMR, later will support other versions, and built-in FM repeater controller.
4. The modem can be used in either simplex or duplex mode for all modes except DMR and FM, while full duplex must be used for DMR and FM.
5. This board needs to be used For Raspberry Pi PI3, Orange Pi, and various school development boards.

Parameter Description:
1. This board needs to be used with Raspberry Pi PI3, Orange Pi, and various school development boards, running pi-star
2. This board has been used in GM300, GM3188, 3688, 950I, 338, DR-1X, other types of repeaters and bus stations need to be studied by themselves
3. For self-developed programming, Teensy 3.1/3.2 and mbed platforms, the only requirement for hardware is to be based on ARM M3, M4 or M7, and have access to raw interrupts and ADC and ADC ports and digital signaling ports.
4.MMDVM open source multi-mode digital voice modem for Raspberry Pi

Product List:
1X module
1X connecting wire