More than 60 years had passed before I found them. Dozens and dozens of letters written to my family during WWII- from total strangers- to tell my great-grandmother that her son had been captured and was being held as a POW. How did they know this? Well, it seems the short-wave radio had held all the answers. POWs were allowed to state their names and hometowns on the radio, and sometimes relay a short message to their families. Scores of Americans, listening to the German propaganda from so far away, heard my grandfather's information, and took it upon themselves to write to my great-grandmother. All of these dear people wanted to give my great-grandmother a measure of comfort to know her son was alive. That was only the beginning of my journey.

Propagation of Radiowaves introduces the basic concepts and mechanisms of radiowave propagation engineering in both the troposphere and ionosphere, an understanding of which is fundamental to the effective use of the radio spectrum for radiocommunication. Reflecting the wide experience of the exceptional group of authors, the contents provide a firm background to established theory and introduce the most appropriate models, methods and procedures which are of use to spectrum planners, system designers and operators in assessing the estimated performance of radio systems. The field of radio communications continues to change rapidly and the third edition of this outstanding and successful book has been fully updated to reflect the latest developments. The relevant Recommendations of ITU-R Study Group 3 are discussed and put into context. Propagation of Radiowaves, 3rd Edition is essential reading for professionals involved in the planning, design and operation of radio systems, as well as academics and postgraduate students in the field.

This is a study guide for the FCC Element 3 exam for the General Radiotelephone Operator License (GROL). Each chapter contains an explanation of the material on that section of the exam and includes all of the possible test questions with the correct answers shown. Most persons taking the exam for the GROL will have some background in electronics, and some chapters will serve as a review of what you already know. But the GROL exam covers many different areas, some of which might be unfamiliar. This book will be especially helpful when you get to those areas. Basic electricity and electronics are covered. Therefore, it would be possible to pass the test simply by studying this book, even if you have no background in electronics.

Does that transmission line, which connects your antenna and transmitter, seem like a mystery to you? Or perhaps your have other questions: Just how much of the transmitter's rated output power actually gets to the antenna? How much power is consumed by the line itself? Just what is the input impedance of the antenna? Or, what is the input impedance at the transmitter end of a transmission line when the antenna is connected to its other end? Why does my tuner seem to work better on some bands than others? What is the effect of high transmission line SWR? Should I be concerned about high SWRs? What can I do about them? It is the unusual operator who has not at one time or another asked one or more of these questions. Well, now you can easily answer these questions and many others Using simple language the author of this book, a former electronic design engineer and amateur over more than 60 years, shows how to find the answers, quickly, easily and accurately. Those more technically inclined can work with the equations provided by the book; those who just want answers without all the math can use a personal computer and specially developed, easy-to-use programs from a CD and get accurate answers directly with the click of a button But there is more: the book contains many solved examples and each solution is followed by a thorough discussion. Now you can get answers while you learn about transmission lines.

This is a study guide to help you pass the FCC test for the beginning level Amateur (Ham) Radio license, the Technician license. Even if you have no background in radio or electronics, you will be able to pass the test by using this guide. All of the concepts are explained in the most basic terms, and each section of the book is followed by the actual questions you will see on the test. When you are finished with this book, not only will you be able to pass the test, but you will also have a basic understanding of the concepts you will encounter when you get on the air.

Step-by-step tutorial to master current design techniques for wireless communication systems

The Third Edition of "Radio System Design for Telecommunications" brings this highly acclaimed book fully up to date with the latest technological advances and new applications. At the same time, the hallmarks of the previous editions, including the text's popular tutorial presentation, have been retained. Readers therefore get all the tools and guidance they need to master an essential set of current design techniques for radio systems that operate at frequencies of 3 MHz to 100 GHz.

Using simple mathematics, the author illustrates design concepts and applications. The book's logical organization, beginning with a discussion of radio propagation problems, enables readers to progressively develop the skills and knowledge needed to advance in the text. Topics that are new to the Third Edition include: Chapter devoted to wireless LANs (WLANs) as detailed in IEEE 802.11Subsections covering IEEE 802.15, 802.16, 802.20, and the wireless metropolitan area network (WMAN)WiFi, WiMax, and UWB applications that have recently experienced explosive growthBroadband radio in telecommunications, as well as offset frequency division multiplex (OFDM), a new technique for transmitting information in an interference environmentThe use of very small aperture satellite terminal (VSAT) systems as an economical alternative to public switched telecommunication networks (PSTN)

Review questions and problems at the end of each chapter engage readers' newfound skills and knowledge and help them assess whether they are ready to progress to the next chapter. References are provided for readers who want to investigate particular topics in greater depth.

Students in wireless telecommunications will find the book's tutorial style ideal for learning all the ins and outs of radio system design, whereas professionals in the industry will want to refer to the Third Edition for its clear explanations of the latest technology and applications.

Radio is on the verge all right, but on the verge of what? Are we on the cusp of a new renaissance, a time of unprecedented excitement and opportunity? Or are we headed, as some naysayers argue, towards an industry-wide twilight? Making Waves argues that it's the former, not the latter. This book can help any broadcaster navigate a digital wonderland of infinite choice and endless competition. Dive in. The water's fine. Let's make some waves.

This book is a follow up to the award winning first edition and is written as a comprehensive guide for those who need to obtain a working knowledge of radiowave propagation on satellitetoground links at frequencies above 1 GHz, and as a reference book for experts in the field. To accomplish this, expanded sections of explanatory text, copiously illustrated, enable an undergraduate or nonspecialist to grasp the fundamentals involved. An extensive reference list permits the expert to go to the source material should the level of inquiry go beyond the level of this book. The book is broken down into chapters that deal with the major propagation phenomena classes. After a broad introductory chapter, there are extensively updated chapters on ionospheric effects, clear air effects, attenuation effects, and depolarization effects. New chapters on mobile communications effects and optical communications effects are followed by a chapter on restoration of performance during impairments. This is an ideal reference for all levels of inquiry into satellitetoground radiowave propagation at frequencies above 1 GHz. Review questions are included in all chapters so that the book can act as a textbook for university study. A reference book and comprehensive guide for those working in satellite to ground radiowave propagation at frequencies below 1GHz. Can also be used as a textbook for University study.

The first book of its kind, the 1933 Official Audio-Radio Service Manual contains all the auto-radio service data available on July 5, 1933, the original publication date of this book. It is a complete director of all automobile radio receivers and presents full installation and trouble-shooting guides. A few manufacturers are not represented because they had no information ready for release at that date. Receivers made by companies including Acme Radio, Allied Radio, Arvin, Atwaterkent; and on through Galvin, A. H. Green, Grigsby-Grunow; and on through Philco, Transformer Corp of America; and concluding with Rudolph Wurlitzer and Zenith are just a sampling of the brands covered in this single comprehensive volume. The origina manual was assembled in loose-leaf form. Its pages were 3-hole punched and came bound in a fabric covered volume. We have brought back the original material for those who still own or collect these old receivers and have been looking for comprehensive service data.

The International Code of Signals is an international system of signals and codes for use by vessels to communicate important messages regarding safety of navigation and related matters. The code covers visual, sound, and radio communications.

This book is a facsimile reprint and may contain imperfections such as marks, notations, marginalia and flawed pages.

Interference whether caused by natural sources (such as lightning static, atmospheric noise, temperature inversions) or artificial ones (other RF/wireless transmitters, electrical machinery, etc.) has plagued RF/wireless communications since the days of Marconi. But it has taken on a special urgency as more wireless services, especially broadband digital ones, come on line; new digital services, such as WiFi and WiMax, are far less tolerant of interference than analog transmission modes (like AM and FM radio). Because of this, a solid knowledge of the causes of RF interference and techniques for mitigating it is becoming vital knowledge for RF/wireless professionals. This book will explore common sources of interference, how to correctly identify the source, and how to reduce or eliminate such interference in a very interesting way.
*WiFi and WiMax interference limitation techniques highlighted
*Covers cutting-edge technical approaches to interference reduction *Discusses how to negotiate with other users to achieve mutual and reciprocal reductions in levels of interference.

Possibly the most important UK wireless traffic in World War II was handled by a unit formed in 1938 by Brigadier Richard Gambier-Parry head of MI6 Section VIII - the communications division of SIS. This book tells of its formation and includes diary entries by one of the 'founding fathers' recording the secret meetings that took place, and the assembly of its talented staff. It reports the earlier days of the original SIS wireless 'Station X' based in Barnes in south west London, and the building of its second station in a bungalow in Surrey with the strange name of 'Funny Neuk' - which turned out to be owned by Admiral Sir Hugh Sinclair - 'C' - Chief of Secret Intelligence Services. The units wireless station at Bletchley Park is described and its replacement by the stations at nearby Whaddon Hall which then became the wartime headquarters of Section VIII. It documents the work of our agents in embassies abroad, and of those in German occupied territories; the story of Churchill's personal wireless operator, and there is the description by a German soldier of the Afrika Corps of his operating an Enigma machine at Rommel's headquarters in the desert. The curious story of 'Black Propaganda' is told and the units handling of the military ULTRA traffic out to commanders in the field. Personal tales by those who were part of this most secret of units abound in the book and it is an important record of people and events that-it is no exaggeration to say-helped to win the war. Whilst essential, the technical side of the tale has not been allowed to dominate the book which is profusely illustrated.

Chapter titles include ...(1) Introduction ...(2) The Effect of Cathode Operating Temperature on Tube Life ...(3) The Effect of Bulb Temperature on Tube Life ...(4) Advantages and Disadvantages of Cathode Bias ...(5) Bias Circuits ...(6) Cathode-Current Stability and Maximum Permissible Grid Resistance ...(7) Correlation Between Cathode Current and Other Tube Properties ...(8) Effects of Structure on Pentodes, Tetrodes, and Beam-Power Tubes ...(9) Limitation of Screen-Grid Dissipation by Series Resistor ...(10) Use of a Screen Resistor Permitting Higher Values of Control-Grid Resistance ...(11) Development of Composite Operating Curves ...(12) Probable Operating Conditions of a Four-Tube String ...(13) Comparison with Constant Voltage Operation ...(14) Application of Composite Heater Voltage-Current Curves ...(15) Transient Conditions ...(16) The "Honeycomb" Construction ...(17) Warm-Up and Operating Time ...(18) Heater-Cathode Leakage ...(19) Parallel Operation of Electron Tubes ...(20) Application Data on 20 Tube Types Covered in MIL-STD-200D ...(21) Tube Data.

"An Introduction to UMTS: Specifications, Testing and Standards Bodies" is the most comprehensive text for practicing engineers and technicians about testing, specification and standards bodies of cellular communications equipment. It is aimed at those responsible for developing and maintaining both mobile and base station units. Each chapter discusses in detail the necessary elements moving to the more advanced components. In addition to testing, specification and standards bodies, readers will learn: the development life cycle of UE and Node-B building blocks; what needs to be tested; when and how testing should be performed; as well as certification formalities, including processes and procedures; and testing tools and languages.

AC6V's Guide To DXing features the advice of several noted DXers and technical gurus. The book features tried and true practical DX advice from those who have been there, done that, and worked them all. It is intended for those entering into HFing and the wacky world of DXing. Old timers not yet on the Internet will learn much from this book as well.

Ultra wideband technology turns the radio spectrum available to wireless applications from a country road into a high-speed ten lane super freeway, and the destination is the future of wireless technology. UWB is a huge leap forward because it offers wide bandwidth with little interference, allowing multiple UWB signals to share a single channel. This multi-author volume, compiled under the guidance of Dr. Roberto Aiello, introduces the theory and concepts behind ultra wideband (UWB) systems as well as their applications. Authors include those involved in creating the UWB standards, researchers, and applications specialists.
This book has been broken down into three parts: introduction to UWB, different techniques available, and applications. Within these sections topics covered are UWB spectrum and regulations, UWB channels, modulation techniques, antennas, signal propagation, and UWB transceiver architectures. This book has all the information RF/wireless engineers will need to understand this burgeoning technology.
*An all-star list of contributors covers the subject more authoritatively than any single author could
*Discusses U.S. and international ultra wideband regulations
*Includes material on antenna systems and signal propagation at ultra wideband frequencies

When Radio Was King offers a reflection on the Golden Age of Radio (1930's to 1940's) by one who was an integral part of American entertainment. The author relates a series of personal observations on radio comedy, it's famous participants and its lasting effect on the American psyche that was reeling from an earlier depression and participation in the greatest world war in history. Furthermore, it is not only a vivid and humorous look at radio comedy, but packs a dual punch in that contains a primer on comedy-writing with actual scripts and snippets of scripts from a recognized veteran comedy writer of the Golden Age.