1994

History of International Broadcasting

Tue, 10 Nov 2020 10:14:06 GMT

The history of radio broadcasting is traced from its earliest origins, through its role as a subversive tool in World War II to the cold war era, and finally to its present day use as an instrument of foreign policy used by over 160 countries.

The effects on the cold war, in which propoganda broadcasting was the ultimate weapon, contributing in no small measure to the collapse of communism in the USSR, are analysed. The roles of Voice of America, the BBC World Service and others come under scrutiny, and the concluding chapters report on the explosive growth in international broadcasting now taking place in the aftermath of recent political events.

The book is supplemented with up-to-date technical data and statistics on major expansions now under way or being planned in many countries, particularly the USA and the Arab states, some of the latter having a broadcasting capacity that dwarfs most western countries.

The appeal of the book is by no means restricted to scientists and engineers and many will find much to stir their memories of international radio broadcasts in wartime and peacetime alike.

A Handbook for EMC Testing and Measurement

Wed, 04 Nov 2020 10:46:35 GMT

During the 1980s the worldwide interest in electromagnetic compatibility (EMC) grew rapidly with the introduction of legislation to control the growing interference problems generated by the increased use of electronic equipment in industry and in the home. The European directive harmonising EMC measurements gave particular impetus to manufacturers and importers of electrical and electronic equipment in Europe to understand EMC design techniques and verification procedures. This book explains how equipment can be verified by testing. It discusses the nature of EMC standards world wide and describes in detail testing methods and their conduct and accuracy. In addition to standard EMC testing, topics including electrostatic discharge, nuclear electromagnetic pulse and lightning are also discussed.

In the broad span of its subject matter, the interests of equipment manufacturers, EMC test engineers, project managers and company administrators are addressed. The testing of both military and commercial electronic equipment is covered. Particular emphasis is placed on the nature of EMC test equipment and how to use it to make reliable measurements.

ISDN Applications in Education and Training

Tue, 12 Jun 2018 01:24:33 GMT

ISDN presents a new challenge for educators and trainers. This book provides an introduction to the technology for educators interested firstly in whether to use it and secondly in how to use it. The first three chapters discuss practical, educational and strategic issues related to these two questions. The following ten chapters provide case studies of education and training uses of ISDN technologies in Europe, the US and Australia. These involve videoconferencing, audiographics, desktop conferencing and image banks. The book concludes with a large glossary of explanatory material.

Data Communications and Networks, 3rd Edition

Tue, 12 Jun 2018 01:18:23 GMT

There has been unprecedented development in data communications and services since the first edition of this book was published in 1986. In less than a decade the technology has advanced beyond all recognition and the first edition is now really no more than an interesting historical record. The second edition, published in 1989, reflected some of these developments and introduced the then emerging proposals for an integrated services digital network (ISDN). Since that date ISDN has become a fact and has already begun to be superseded by proposals and standards for a broadband ISDN (B-ISDN), offering greatly enhanced and flexible data rates over a public network based mainly on optical fibre transmission. Optical fibre technology is also being used in wide-area private digital networks and for high-capacity internetworking operations.

This third edition has new chapters on broadband ISDN, wide-area internetworking and second generation (broadband) LANs and MANs. The chapters from the second edition on data services over cellular and broadcast radio have been retained and updated. The chapter on standards and interfaces has needed to be completely revised.

The final chapter gives a network user's view of the likely scenario for the development of image networks in the foreseeable future. On the back cover of the second edition I commented that what four years ago appeared as simply speculation was now a reality. The same is true for this third edition. If there should be a fourth edition in another four years time, we should not be surprised to find that duplex visual image communication, as opposed to broadcast TV, has become an accepted part of our way of life.

The Early History of Radio

Tue, 12 Jun 2018 00:25:59 GMT

Much has been written about Faraday and Marconi, and about the history of the development of radio from the time of Marconi. However, Gerald Garratt's special interest was in what might be termed the 'prehistory' of radio. This book therefore outlines the sequence of development from Faraday's first prediction and concept of the electromagnetic field: Maxwell worked out the mathematics of electromagnetic wave propagation and Hertz demonstrated their physical existence. Lodge identified the need for resonance between transmitter and receiver, thus leading to Marconi's successful practical application.

Vacuum Switchgear

Tue, 12 Jun 2018 00:02:48 GMT

This book provides a broad perspective of vacuum switchgear drawn from the author's many years of experience in this field. Allan Greenwood describes the development of the technology from the earliest beginnings to the most recent designs now on offer by leading companies around the world.

The book starts with a solid foundation in the physics of the vacuum arc, in vacuum breakdown and in the fundamentals of current interruptions in vacuum. For the user there is an exhaustive chapter on applications, which spans all devices from contactors through switches and reclosers to power circuit breakers. Maintenance is also addressed. There are four chapters on different aspects of design and another on testing, which should appeal to the designer. The chapter on manufacturing concentrates on the interrupter as its manufacture is so entirely different from that required for oil and gas-blast circuit breakers. The treatment is comprehensive so the book will be useful to users, designers and manufacturers alike, and to students who wish to become acquainted with the subject.

Energy Storage for Power Systems

Mon, 11 Jun 2018 23:26:56 GMT

Energy flow from many primary sources is not constant but depends on the season, time of day and weather conditions. Energy demand also varies with the same circumstances, but generally in reverse. Obviously there needs to be some way for energy suppliers to separate the processes of energy generation and consumption, by storing energy until it is needed.

Electricity is the most flexible and convenient form of energy for transmission and use but it is not economically possible to store electrical energy in significant quantities. Secondary energy storage systems can accept energy generated by a power system, convert it to a form suitable for storage, keep it for a certain time and then convert it into the form required by the consumer when it is needed. These systems are an essential tool in managing energy supplies.

This book is a comprehensive guide to the various types of secondary storage systems and an introduction to the multidisciplinary problem of choice of their types and parameters. It is chiefly aimed at students of electrical and power engineering, and design and research engineers concerned with the logistics of power supply. It will also be valuable to all those interested in the development of environmentally benign power supplies.

Electrical Safety

Mon, 11 Jun 2018 23:22:36 GMT

This book explains the hazards associated with electricity in its many forms, including electromagnetic radiation. It describes methods of reducing risks to health and to the environment, giving rules and codes of practice to be followed. Guidelines are also given for the use of electrical equipment in specialised environments (such as locations subject to explosive gases and flammable dusts), the guarding of machine tools and the control of earth currents.

Human safety and care for the environment are of increasing concern and the broad scope of the book makes it essential reading for those involved in engineering and technology at all levels; no specialised knowledge of electro-technology is presumed. It is a reference book for personnel responsible for their company's safety policy and for municipal authorities (particularly in Commonwealth countries) and other bodies concerned with technical training, industrial development and planning.

Microwave Horns and Feeds

Mon, 11 Jun 2018 22:31:19 GMT

This book is the first comprehensive treatment of microwave horns and feeds for reflector antennas for use in satellite and terrestrial communications, radar and radio astronomy. The feed for a reflector antenna is a crucial component because the performance of the reflector depends on a good feed to collect or radiate signals.

The book presents the principles and applications of reflector and horn antennas with emphasis on the developments of the last decade. The background theory is included and the analytical techniques are explained. Extensive design data and numerous examples of practical horn and feed antennas are given.

The book is a collaboration between four authors, bringing together an unrivalled knowledge of analytical techniques and experience in designing horns, feeds and reflector antennas. The book should be of value to both the research worker and the designer of practical feeds for reflector antennas.

Microwave Field-Effect Transistors, 3rd Edition

Mon, 11 Jun 2018 22:30:48 GMT

This book covers the use of devices in microwave circuits and includes such topics as semiconductor theory and transistor performance, CAD considerations, intermodulation, noise figure, signal handling, S-parameter mapping, narrow- and broadband techniques, packaging and thermal considerations. Perhaps the most comprehensive text on GaAs FET technology and its practical application. It covers the use of MESFET devices in microwave circuits, such as low-noise amplifiers, mixers, oscillators, power amplifiers, switches and multipliers. This text is a classic reference for all engineers involved in the development of solid state microwave devices.

HF Filter Design and Computer Simulation

Mon, 11 Jun 2018 22:23:22 GMT

A book for engineers who design and build filters of all types, including lumped element, coaxial, helical, dielectric resonator, stripline and microstrip types. A thorough review of classic and modern filter design techniques, containing extensive practical design information of passband characteristics, topologies and transformations, component effects and matching. An excellent text for the design and construction of microstrip filters.

Geometrical Theory of Diffraction

Mon, 11 Jun 2018 22:19:41 GMT

The geometrical theory of diffraction (GTD) is an efficient method of analysis and design of wave fields. It is widely used in antenna synthesis in microwave, millimetre and infra-red bands, in circuit engineering and laser system design. It is a convenient tool for tackling the problems of wave propagation and scattering at bodies of complex shape. The method combines the simplicity and physical transparency of geometrical optics with high computational accuracy over a wide dynamic range of quantities analysed. The advantage of GTD is particularly pronounced in applications where the wavelength is small compared with the typical size of scatterers, i.e. in situations where the known analytical techniques - variational calculus and numerical analysis - are no longer applicable.

This book painstakingly systematises the ideas underlying GTD, gives a detailed explanation of the modern state of the theory within the bounds of its validity, and elucidates its relationships with other popular asymptotic theories - the methods of physical optics and edge waves.

The book is designed for scientists, engineers and postgraduate students involved in electromagnetics, radio engineering and optical system design.

Analysis of Metallic Antennas and Scatterers

Mon, 11 Jun 2018 22:02:14 GMT

Most antennas are assembled from conducting surfaces and wires. The usual approach to numerical analysis of such structures is to approximate them by small surface or wire elements, with simple current approximation over the elements (the so-called subdomain approach), which requires a large amount of computer storage. This book describes a novel general entire-domain method for the analysis of metallic antennas and scatterers which enables the solution of a very wide class of problems to be obtained using computers of relatively modest capability.

Antenna-design engineers, scientists and graduate students interested in the analysis and design of electrically small and medium-sized metallic antennas and scatterers will find in this book a self-contained and extremely powerful tool that circumvents most difficulties encountered in other available methods.