Parts list:
3.3V regulator 
Digi-Key part #296-13424-1-ND

RS232 converter Digi-Key part # ICL3232CP-ND
This one works well in the 3 Volt circuit.

atmega8515L Digi-Key part #atmega8515L-8PC-ND

RF24G module from QKits:
part # TRRX24G

all capacitors, connectors, and sockets are generic.

