I recently came across a design for an Arduino controlled AD9850 DDS module, created by AD7C, so I figured I would release my Eagle CAD design for the PCB here.
It is a mainly single-sided layout, only a few links on the top side are needed so this is easy to etch with the toner transfer method.
My version uses an Arduino Pro Mini, as the modular format is much easier to work with than a bare ATMega 328.
RF output is via a SMA connector & has a built in amplifier to compensate for the low level generated by the DDS Module.
Version 2 Update: Added reverse polarity protection, added power indicator LED, beefed up tracks around the DC Jack.