Our original paper on SDR development is now freely available on the QUADRUS SDR platform site. The paper introduces our high-speed, high-bandwidth domain converter solutions, and demonstrates their capability through practical examples, like our wideband SDR search-and-intercept receiver and our SDR radar. The paper was first published in the proceedings of the advanced communication seminar by the NATO Research and Technology Organization (NATO RTO) – now known as the NATO Science and Technology Organization under the NATO Collaboration Support Office.