Basic NEC with broadcast applications
Basic NEC with Broadcast Applications addresses computer modeling of MF directional broadcast antennas and illustrates the assets and liabilities of the Numerical Electromagnetic Code (NEC). The book's ""how to"" approach reveals the fundamentals of NEC operation, teaches br...
| Autor principal: | |
|---|---|
| Formato: | Libro electrónico |
| Idioma: | Inglés |
| Publicado: |
Amsterdam ; Boston :
Focal Press/Elsevier
c2008.
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| Edición: | 1st edition |
| Materias: | |
| Ver en Biblioteca Universitat Ramon Llull: | https://discovery.url.edu/permalink/34CSUC_URL/1im36ta/alma991009627620106719 |
Tabla de Contenidos:
- Cover; Title Page; Copyright Page; Table of Contents; Foreword; Preface; Acknowledgments; About the Author; CHAPTER 1 The Array Adjustment Process; 1.1 The Nature of NEC-2; 1.2 The Directional Antenna Adjusting Process; 1.3 Local and Global Minima; 1.4 The Role of NEC-2; 1.5 Analysis Overview; 1.6 Additional NEC-2 Benefits; 1.7 Software Requirements; CHAPTER 2 NEC-2 Fundamentals; 2.1 Scope; 2.2 The NEC-2 Engine; 2.3 NEC-2 Operation; 2.4 Creating the Input File; 2.4.1 Naming the Files; 2.4.2 Data Commands; 2.4.3 Data Command Types; 2.4.4 An Input File Illustration; 2.5 Reading the Output File
- 2.5.1 The Header2.5.2 Structure Specifications; 2.5.3 Segmentation Data; 2.5.4 Data Commands, Frequency, Loading, and Environment Data; 2.5.5 Antenna Input Parameters; 2.5.6 Currents and Location; 2.5.7 Current Moments; 2.5.8 Power Budget; 2.5.9 Radiation Pattern; 2.6 Exercises; CHAPTER 3 Modeling the Radiator; 3.1 Modeling Guidelines; 3.2 Guideline Summary; 3.2.1 Modeling the Radiator; 3.2.2 Modeling the Voltage Source; 3.3 Tower Configurations; 3.3.1 Single-Wire Configuration; 3.3.2 Four-Wire Configuration; 3.3.3 Two-Wire Configuration; 3.3.4 Lattice Configuration
- 3.4 Viewing Tower Configuration3.5 Exercises; CHAPTER 4 Array Geometry; 4.1 The Coordinate System; 4.2 Array Geometry: An Example; 4.3 The Array Input File; 4.4 Exercises; CHAPTER 5 Loads, Networks, and Transmission Lines; 5.1 Modeling Impedance Loads; 5.2 Modeling Nonradiating Networks; 5.2.1 Typical Networks; 5.2.2 Typical Network Applications; 5.2.3 General Guidelines for Networks; 5.3 Modeling Transmission Lines; 5.4 Network Output File Listing; 5.4.1 Network Descriptions; 5.4.2 Source and Load Impedance to the Networks; 5.4.3 Network Input Parameters; 5.5 Exercises
- CHAPTER 6 Calculating Base Drive Voltages6.1 Base Drive Voltages; 6.2 Direct and Induced Currents; 6.3 Current Moments; 6.4 Development Concept; 6.4.1 Unity Drive; 6.4.2 Normalized Drive; 6.4.3 Full Power Drive; 6.4.4 Shunt Reactance and Networks; 6.5 Example: A Three-Tower Array; 6.5.1 Create a Unity Drive File; 6.5.2 Calculate Unity Drive Current Moments; 6.5.3 Solve for the Normalized Drive Voltages; 6.5.4 Determine the Full Power Drive Voltage; 6.6 Exercises; CHAPTER 7 Using Data from the Output File; 7.1 Overview; 7.2 Verify the Field Ratios; 7.3 Plot Far-Field Radiation Pattern
- 7.4 Detuning Unused Towers7.4.1 Detuning by Base Loading; 7.4.2 Detuning by Skirting; 7.5 Antenna Monitor Readings; 7.5.1 Optimum Height for Sample Loops; 7.5.2 Arbitrary Height for Sample Loops; 7.5.3 Base Current Samples; 7.5.4 Base Voltage Samples; 7.6 Drive Point Impedance; 7.6.1 Drive Point Impedance When Using a Network; 7.7 Exercises; CHAPTER 8 Model by Measurement; 8.1 Objective; 8.2 Adjusting the Model; 8.2.1 Number of Segments; 8.2.2 Tower Diameter; 8.2.3 Segment and Radius Taper; 8.2.4 Base Capacity; 8.2.5 Drive Segment Radius; 8.3 Exercise; CHAPTER 9 Top-Loaded and Skirted Towers
- 9.1 General Considerations
