Simple Ham Radio Antennas

Many antennas, multiple benefits : " Many antennas , multiple benefits", Jan 21, 2015 By combining large distributions of compact antenna nodes with fast fiber optic communication, researchers have developed a new wireless infrastructure ready for intense future demands. Credit: A* A*STAR Institute for Infocomm Research A concept that balances large-scale installations of low-cost and low-power antennas to boost cellular coverage in difficult environments will also provide better connectivity to more users. Developed by A*STAR, this new architecture for wireless communications can help service providers meet growing demands for increased network capacity and improved energy efficiency. Jingon Joung, Yeow Chia and Sumei Sun from the A*STAR Institute for Infocomm Research in Singapore sought to combine two state-of-the-art wireless technologies into a novel type of antenna system. The first technology, known as large-scale multiple-input multiple-output (L- MIMO ), use...

TVTechnology: Low-Level RF Signals Allow Hackers to Grab Data From Laptops : "Low-Level RF Signals Allow Hackers to Grab Data From Laptops. No Wi-Fi required. As anyone who has tried to use a portable AM or shortwave radio near a computer knows, computers emit a variety of RF signals over a wide range of frequencies. The emissions can extend into the VHF bands. Although these emissions are considered noise or interference, the reality is they contain information about what's happening inside the computer. Researchers at the George Institute of Technology are studying these emissions to help hardware and software designers develop strategies to plug these RF data leaks. Alenka Zajic, an assistant professor in Georgia Tech’s School of Electrical and Computer Engineering, explains, “People are focused on security for the Internet and on the wireless communication side, but we are concerned with what can be learned from your computer without it intentionally sending anything...