I have drawn some diagrams which I twitted before, but since interest is growing on using SDR for SAT I have included few more diagrams and consolidated in just one document, I think the link is working, if not let me know I can send the file individually. https://drive.google.com/file/d/0B2wc2KHr8WW2MFlkR3M3azFBcW8/view?usp=sharing 73 EDu PY2RN