My friends and I at NW Digital Radio have been working on an AMBE card to plug into the UDRX-440 Universal Digital Radio.
In the process of reviewing the design we determined there were 2.5 million Raspberry Pi computers and some of those might belong to Amateur Radio operators. We decided that we would make the card compatible with the Raspberry Pi GPIO interface and this would allow developers to create applications for the D-STAR, DMR, dPMR, Fusion, APCO 25 Phase 2 HR, NXDN, and other radio protocols which use AMBE based voice encoding.
That product launched at the Dayton Hamvention last Friday and we are over 50% through our initial inventory.
Initial software is from Jonathan Naylor, G4KLX who joined us at Dayton this year.