MMDVM

MMDVM-Logo

MMDVM Blog  @ http://mmdvm.blogspot.co.uk/

As quoted on github

mmdvm_board
MMDVM Board


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.

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MMDVM Board (old version shown) fitted to an Arduino Due

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.

MMDVM-repeater

For this reason the Raspberry Pi and similar single board computers are not being targeted as access to the raw I/O is mediated by the operating system kernel and does not provide the performance, nor does the hardware provide the necessary direct access to the I/O pins on the ARM processor. However such boards are very useful for hosting the interface of the modem to external networks such as ircDDB in the case of D-Star.

Cost is approx $40 plus $12 for MMDVM Board on it’s own from CLICK HERE TO VISIT SITE

 

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GB7DD DMR UHF Motorola Amateur Radio Repeater

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