From charlesreid1

GMSK modem for the RPi

The Raspberry Pi GMSK Modem board needs only a suitable N-FM radio .. add TWO radios and you get a D-Star repeater...add an internet connection for a fully functioning D-Star gateway, either simplex or full duplex!

This boards CMX589 GMSK modem connects directly to the GPIO socket.

Link: http://ki6zum.com/dstar/dv_overview.htm

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