Radios That Work For Free

Based on the popular Artech House classic, Digital Communication Systems Engineering with Software-Defined Radio, this book provides a practical approach to quickly learning the software-defined radio (SDR) concepts needed for work in the field. This up-to-date volume guides readers on how to quickly prototype wireless designs using SDR for real-world testing and experimentation. This book explores advanced wireless communication techniques such as OFDM, LTE, WLA, and hardware targeting. Readers will gain an understanding of the core concepts behind wireless hardware, such as the radio frequency front-end, analog-to-digital and digital-to-analog converters, as well as various processing technologies. Moreover, this volume includes chapters on timing estimation, matched filtering, frame synchronization message decoding, and source coding. The orthogonal frequency division multiplexing is explained and details about HDL code generation and deployment are provided. The book concludes with coverage of the WLAN toolbox with OFDM beacon reception and the LTE toolbox with downlink reception. Multiple case studies are provided throughout the book. Both MATLAB and Simulink source code are included to assist readers with their projects in the field.

A DIY guide to designing and building transistor radios Create sophisticated transistor radios that are inexpensive yet highly efficient. Build Your Own Transistor Radios: A Hobbyist’s Guide to High-Performance and Low-Powered Radio Circuits offers complete projects with detailed schematics and insights on how the radios were designed. Learn how to choose components, construct the different types of radios, and troubleshoot your work. Digging deeper, this practical resource shows you how to engineer innovative devices by experimenting with and radically improving existing designs. Build Your Own Transistor Radios covers: Calibration tools and test generators TRF, regenerative, and reflex radios Basic and advanced superheterodyne radios Coil-less and software-defined radios Transistor and differential-pair oscillators Filter and amplifier design techniques Sampling theory and sampling mixers In-phase, quadrature, and AM broadcast signals Resonant, detector, and AVC circuits Image rejection and noise analysis methods This is the perfect guide for electronics hobbyists and students who want to delve deeper into the topic of radio. Make Great Stuff! TAB, an imprint of McGraw-Hill Professional, is a leading publisher of DIY technology books for makers, hackers, and electronics hobbyists.

Shortwave, Microwave, radars, satellites and beacons.

Among America's most unusual and successful weapons during the Cold War were Radio Free Europe and Radio Liberty. RFE-RL had its origins in a post-war America brimming with confidence and secure in its power. Unlike the Voice of America, which conveyed a distinctly American perspective on global events, RFE-RL served as surrogate home radio services and a vital alternative to the controlled, party-dominated domestic press in Eastern Europe. Over twenty stations featured programming tailored to individual countries. They reached millions of listeners ranging from industrial workers to dissident leaders such as Lech Walesa and Vaclav Havel. Broadcasting Freedom draws on rare archival material and offers a penetrating insider history of the radios that helped change the face of Europe. Arch Puddington reveals new information about the connections between RFE-RL and the CIA, which provided covert funding for the stations during the critical start-up years in the early 1950s. He relates in detail the efforts of Soviet and Eastern Bloc officials to thwart the stations; their tactics ranged from jamming attempts, assassinations of radio journalists, the infiltration of spies onto the radios' staffs, and the bombing of the radios' headquarters. Puddington addresses the controversies that engulfed the stations throughout the Cold War, most notably RFE broadcasts during the Hungarian Revolution that were described as inflammatory and irresponsible. He shows how RFE prevented the Communist authorities from establishing a monopoly on the dissemination of information in Poland and describes the crucial roles played by the stations as the Berlin Wall came down and the Soviet Union broke apart. Broadcasting Freedom is also a portrait of the Cold War in America. Puddington offers insights into the strategic thinking of the RFE-RL leadership and those in the highest circles of American government, including CIA directors, secretaries of state, and even presidents.