ArduTrx is a 2-meter-band ham radio transceiver which uses an Arduino as precessor board. I made a Arduino shield with the Dorji DRA818V transceiver module (http://www.dorji.com/docs/data/DRA818V.pdf). Together with an Arduino board and a SainSmart LCD Keypad Shield (https://www.sainsmart.com/products/lcd-keypad-shield-for-arduino-duemilanove-uno-mega2560-mega1280 ) you can build a complete ham radio transceiver and start communicating. This project does not only give some basic functions to communicate with the DRA818V, it moreover has all the fuctions for a completly usable transceiver.
The ArduTrx shield should be compatible with all 5V Arduinos. Compatibility was explicitly tested with Arduino Uno and Arduino Leonardo.
A version also compatible with 3.3V Arduinos is planed.
You can find the source code on github: https://github.com/generationmake/ArduTrx
Here is a link to the schematics: http://blog.generationmake.de/file_download/1/dra-shield.pdf