2019 MMDVM Repeater Multi-Mode Digital Voice Modem for Raspberry Pi Arduino Support YSF D-Star DMR Fusion P.25  . This board needs to cooperate Raspberry Pi PI3, orange pie, a variety of school development board to use 2. This board has been applied in the GM300 GM3188 3688 950I 338 Vitex DR-1X, other types of repeaters and car stations need to be studied yourself Product Description: - The MMDVM is intended to be an open-source Multi-Mode Digital Voice Modem,which utilities the power of an ARM processor and a simple analogue interface board. - The Multi-Mode Digital Voice Modem is a combined hardware and software development of a modem to handle all amateur digital voice modes. Initially it will support D-Star and DMR,with System Fusion and P.25 coming later,as well as a built-in FM repeater controller.For all modes other than DMR and FM,the modem can be used in simplex or duplex mode,while for DMR and FM full duplex must be used. - The MMDVM is aimed at the Arduino Due,Teensy 3.1/3.2 and mbed platforms,the only requirement for the hardware is to be ARM Cortex-M3,M4,or M7 based,and access to raw interrupts and ADC and ADC ports as well as digital signalling ports. Package List: - 1 x Board - 1 x Moto connection cable - 2 x Fasten screws - 2 x Nuts          Describe your brand story, including establishment and development timelines, milestones, etc.