eBay AD9850 DDS module using 2, I-Q generation for SDR

Projects General Guidance
1

I have a need for I-Q generation (0'+90')for SDR
Looking at using 2 eBay DDS modules with arduino board, LCD, rotory encoder, program to control DDS modules with control word for 0' & 90' phase output.
Have seen a few projects for single DDS module but not 2 for I-Q generation.

2

You may generate I & Q using 1 AD98XX and 74HC74 D-flip/flops, though upper frequency would be x4 times lower.
http://coolarduino.wordpress.com/2012/11/20/diy-am-radio-with-arduino/

3

Need coverage up to 30Mhz, I-Q freq to drive pair of balanced mixers into soundcard.
Need to prog up arduino to do, send serial data to both DDS modules with module 1 phase word=0, module2 phase word =90. both modules have same 32 bit freq data.
Im bit weak on C programming :frowning: