I believe this is the most likely component for the UHF communications system.
http://www.clyde-space.com/cubesat_shop/communication_systems/350_utrx-half-duplex-uhf-transceiver
Besides using most of the CubeSAT internal kit equipment. I intend to design a Raspberry Pi Zero to go up with it. Inspired by the new micro board design I believe it would be possible to create a little on board network of computers with the remaining space using the new Raspberry Pi Zero.
At least thats the idea.
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I didn’t really explain my rational for using UHF. Now the biggest reason is the total expense of communicating with the satellite. Using S-Band would cost way too much money on the ground. UHF is cheap and affordable and using UHF also reduces the overall payload weight of the hardware.