Micro-RC Repeater Controller
The Micro-RC Repeater Controller is a modern design GNU open-source repeater controller using all SMD components. The Micro-RC is centered around the Atmel ATMega1281 micro controller, picoOS RTOS and the new CML Microcircuits MX828 CTCSS/DCS/SelCall full duplex PL encoder/decoder chip. The entire four layer PCB measures only 3×6″ and packs LOTS of features into a low/mid price range controller.
   Micro-RC Repeater Controller
More detail on Micro-RC Repeater Controller website
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