The 9th scientific workshop presented by the 19th URSI-C in Japan 1.    Convener: Satoshi Tsukamoto, Advanced Telecommunications Reserch Institute International 2.    Date/time: 13:00 -16:35, January 06, 2006 3.    Venue: Shimei-so, a resort house of Nippon Telephone and Telegram Health Insurance Association (Minakami, Gunma Prefecture, Japan) 4.    Registration fee: Free 5.    Listed attendees: 21 persons 6.    Local arrangement: Advanced Telecommunications Reserch Institute International 7.    Session title: “Radio Waves and Radio Receiver, History from crystal radio to Software Defined Radio and Cognitive” 8.    Presentations: 50 min including Q&A for each speaker (a) “History of transmitter and receiver architectures”         Speaker: Dr. Makoto TAROMARU, Wave Engineering Laboratories, Advanced Telecommunications Reserch Institute Intrenational. (b) “Technical Trends of RF signal Sampling Method for Realization of Software Defined Radio ”         Speaker: Associate Professor Yukitoshi SANADA, Keio University. (c) “Development of Analog-Digital Converter Chips for Software Radio Receivers”        Speaker: Mr. Takafumi YAMAJI, Corporate R&D Center, Toshiba Corporation. (d) “Cognitive radio technique serves ubiquitously connected environment”        Speaker: Dr. Hiroshi HARADA, Yokosuka Radio Communications Research Center, National Institute of Information and Communications Technology 9.    Banquet         Venue: at saloon in Shimei-So         Attendees: 13 persons 10.    The steering committee meeting took place from 9:00 to 10:00 on January 07, 2006. 11.    Concluding The presentations started from old radio set that has the vacuum tube covered few places for cost down, to software defined radio set that had innumerable transistors. The ideas and efforts by old engineers impressed and should be copied by engineers of today. Dr. Taromaru presented idea and working principle of the existing radio sets with showing its circuit diagram. Professor Sanada presented comparisons of sampling methods and devices that dominate variations and performance of software defined radio sets. And then, Mr. Yamaji presented A/D converter that is key device for software defined radio set, problems that should be resolved for example increase of power consumption at high speed, trends and result of his research. Finally, Dr. Harada introduced his radio set that had developed for several years and presented the future transceivers. A banquet was held with a lot of talk. It was continually discussed difference between old and new radio set components and technical problems for making a software defined radio set at the room. In spite of the inconvenient traffic access in the record heavy snow on that day and the next day of the workshop, all expected participants could join the workshop, and it ended without problems.