SDR design and architecture

[ThElectriCat]

Maybe this is scary technical, but is anyone out there designing or building their own software defined radio?
 I think this is a project that is getting more attainable with the myriad of phenomenal parts from Analog devices, Maxim, TI and others. 
If anyone has any Ideas they have been thinking of lately, let me know, especially anyone who has ideas but feels like building an SDR is a big stumbling block.
            My hope if for this thread to be a source of input and feedback for people with ideas so those ideas can be further developed.

so far my main interests in sdr are;
   effecient undersampling to realize higher frequencies with a direct sampling front end
   use of homodyne and weaver architectures in the digital realm to reduce the dependence on processor power for demodulation

[ThElectriCat]

 Dont mean to be just talking to myself here, but over 100 views tells me its not a waste,
 Has anyone thought of tuning the sample rate of the ADC in an sdr? Kind of like the LO in a receiver, That way one could move receiver images and aliases around, and determine that your heard signal was actually the desired one?

[Josh]

This is interesting as long as you do all the work. Lol. I have a hard enough time seeing the pc screen let alone having to breadboard a dsp chip and some adc/dacs and deal with all the incidental signals that will be impinging upon its hapless inners. I'm happy with my factory made sdr rigs and their controlling wares. That being said the utwente sdr rig is glorious and I'd like to build one if a kit was available and cheap.

[redhat]

Everyone has their strong suite, and DSP is not one of mine.  I'm an analog guy that has a hard enough time writing stuff in C to make embedded stuff work.

More power to ya!

+-RH