It is a high end sound chip (CODEC) and the modem is done in software. It is packaged with GPIO pins brought out to monitor and control the DR-1X. Drivers for the sound CODEC and GPIO management are implemented to drive the UDRC and DR-1X repeater.
One could implement similar functionality in piecemeal fashion, however, NW Digital Radio has packaged it for you and makes for a simple installation.
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I'm looking closely at the UDRC board to add d-star to a yeasu repeater.
What is on the board to make this work? Is there a GMSK decoder on the board? or is this supposed to be done in software? The colloquial description I have heard of the board, is that it's just a nicely packaged "sound card".
Thanks for the clarification!