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An MF (medium frequency) antenna covers the AM broadcast band. A DA (directional array) antenna receives or sends signals most effectively in a particular direction. Currently, there are 5000 existing MF directional antenna systems in the U.S. alone that are being replaced at a rate of 100 antennas per year. This does not include continual maintenence. The worldwide market consists of 10,000 to 15,000 engineers/technicians during the next 5 years that will be using this information. Basic NEC with Broadcast Application 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 the teaching broadcast applications and shows you how to use NEC to: model non-radiating networks, verify calculations, detune unused towers, design top-loaded and skirted antennas, minimize coding by moving and duplicating structures, and much more.
J.L. Smith holds a B.S. in Physics from the University of Houston and an M.S. in Engineering from Southern Methodist University. Through his career, Mr. Smith held the usual positions in research and development beginning his career at KTRH in Houston, Texas in 1946, joining Collins Radio Company in 1956 where he was Department Head, Research and Development, then Manager, Broadcast Systems Engineering. Mr. Smith has been active in FCC matters having filed the first petition advocating automatic unattended operation of FM broadcast transmitters. He participated in the coordination of international broadcasting through his service on CCIR Study Group 10, authored over 50 technical papers and has published Basic Mathematics with Electronics Applications (Macmillan Company 1972) and (Interference Control Technologies 1993.) J.L. Smith is now retired in Covington, LA where he devotes much of his time to analytical research pertaining to AM directional antennas.
CHAPTER 1 The Array Adjustment Process, CHAPTER 2 NEC-2 Fundamentals, CHAPTER 3 Modeling the Radiator, CHAPTER 4 Array Geometry CHAPTER 5 Loads, Networks, and Transmission Lines CHAPTER 6 Calculating Base Drive Voltages, CHAPTER 7 Using Data from the Output File CHAPTER 8 Model by Measurement CHAPTER 9 Top-Loaded and Skirted Towers, CHAPTER 10 System Bandwidth Analysis CHAPTER 11 Case Studies, CHAPTER 12 Supplemental Topics
