M17 Protocol
M17 is a completely open-source digital voice protocol, designed for amateur radio use. Not a single part of it is patent encumbered. M17 uses Codec 2 voice codec.
Protocol’s specification is available through a GitHub repository.
There’s a list of supported radios, should you want to use Module17 or any other hardware with M17 support with analog FM rigs.
M17 Project’s website
M17 Project article on Wikipedia (available in 9 languages)
M17 Knowledge Base
OpenRTX
OpenRTX is a free and open source alternative firmware for digital ham radios. The firmware is designed with a top-down approach with the objectives of modularity, flexibility and high performance. Currently, it is the only firmware with M17 support. OpenRTX is led by Silvano, IU2KWO.
