Practical_Antenna_Handbook_0071639586

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C h a p t e r 2 : r a d i o - W a v e P r o p a g a t i o n 77 Figure 2.42 Propagation prediction charts from QST have been supplanted by freeware applications and the Internet. (Courtesy of the American Radio Relay League.)
78 p a r t I I : F u n d a m e n t a l s in the business but also near-total access to as much of the raw data as we wish, should we choose to make our own predictions. Appendix B includes an extensive list of Internet sites pertaining to HF propagation. Propagation Software A number of popular software packages for the PC and Mac have tackled ionospheric signal propagation from different directions. Although not as central to the topic of this book as the antenna modeling software described in Chap. 25, a few words are in order about some of them. W6ELProp is freeware that can be found on the Internet. It is no longer maintained by its author, but it remains an easy-to-use Windows application with a user interface that is reminiscent of its DOS predecessor. W6ELProp focuses on conventional F-layer propagation; as such, it does not incorporate some of the “lesser” modes that may enhance signals, such as skew paths. It uses approximations that occasionally limit its accuracy, but it is a wonderful program for quickly getting the feel of propagation between any two points on the globe. In addition to the software itself, a number of other personal sites have published their own unofficial how-to guides for this chestnut. HamCap is freeware offered by Alex Shovkoplyas, VE3NEA. It relies on a separate propagation prediction program called VOACAP, which must be downloaded and installed before HamCap can be used. VOACAP was originally developed by NTIA/ITS for the Voice of America. VE3NEA also offers IonoProbe, which monitors and displays a number of valuable space weather parameters on a near-real-time basis. Other software to check out on the Internet includes CAPMan (and its successor, WinCAP), DXProp, and HF-Prop. For VHF/UHF applications, look into Radio Mobile Deluxe, Ground Wave Prediction System, and RFProp. Terrain Analysis With few exceptions, antenna modeling packages for PCs or Macs assume a perfectly flat ground extending infinitely far in all directions from a point directly beneath the antenna in question. But few radio sites can lay claim to such a terrain, and the question naturally arises: What is the effect of the terrain on signals? HFTA (High Frequency Terrain Assessment) is a program designed by R. Dean Straw, N6BV, to answer just that question. The user must supply details of his or her location to the software because some propagation statistics (arrival angles, for instance) vary with the user’s region of the globe. The program can also download detailed public data files describing terrain contours in the immediate vicinity of the user. Alternatively, the user may be able to manually create a customized profile for his/her site by reading the necessary information off topographic maps of the area and manually entering it into the program. Once it has been provided with all the necessary data, HFTA assesses the terrain that may stand between the user’s antenna site and a clear shot at the ionosphere at a variety of takeoff and arrival angles, examining both reflection and diffraction modes of propagation. In operation, HFTA creates a profile for a single compass direction. If profiles for multiple headings are required, separate passes through the process must be completed. Typically, radio amateurs who wish to locate their antennas so as to maximize
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Practical Antenna Handbook
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Practical Antenna Handbook Joseph J
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Contents Preface . . . . . . . . .
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C o n t e n t s vii 12 The Yagi-Uda
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C o n t e n t s ix Switched-Pattern
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Preface My paternal grandfather was
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P r e f a c e xiii this book repres
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Acknowledgments As with other field
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Background and History Part I Chapt
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CHAPTER 1 Introduction to Radio Com
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C h a p t e r 1 : I n t r o d u c t
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Fundamentals Part II Chapter 2 Radi
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CHAPTER 2 Radio-Wave Propagation To
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C h a p t e r 2 : r a d i o - W a v
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R N-1 C h a p t e r 2 : r a d i o -
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C h a p t e r 4 : T r a n s m i s s
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Chapter 5 Antenna Arrays and Array
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C h a p t e r 5 : a n t e n n a A r
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A. B. C. D. E. F. G. H. Figure 5.9
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B. C. D. E. F. G. H. Figure 5.10 Gr
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High-Frequency Building-Block Anten
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CHAPTER 6 Dipoles and Doublets A co
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C h a p t e r 6 : D i p o l e s a n
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CHAPTER 7 Large Wire Loop Antennas
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C h a p t e r 7 : L a r g e W i r e
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CHAPTER 8 Multiband and Tunable Wir
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C h a p t e r 8 : M u l t i b a n d
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CHAPTER 9 Vertically Polarized Ante
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C h a p t e r 9 : V e r t i c a l l
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Quarter-wave vertical radiator Insu
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Directional High-Frequency Antenna
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CHAPTER 10 Wire Arrays When a singl
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C h a p t e r 1 0 : W i r e A r r a
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Wire 2 C h a p t e r 1 0 : W i r e
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CHAPTER 11 Vertical Arrays Despite
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C h a p t e r 1 1 : V e r t i c a l
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CHAPTER 12 The Yagi-Uda Beam Antenn
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C h a p t e r 1 2 : T h e Y a g i -
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CHAPTER 13 Cubical Quads and Delta
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C h a p t e r 1 3 : C u b i c a l Q
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Figure 13.5 Multiband quad “spide
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High-Frequency Antennas for Special
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CHAPTER 14 Receiving Antennas for H
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C h a p t e r 1 4 : r e c e i v i n
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351 Figure 14.12 Remote tuning sche
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CHAPTER 15 Hidden and Limited-Space
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C h a p t e r 1 5 : H i d d e n a n
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CHAPTER 16 Mobile and Marine Antenn
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C h a p t e r 1 6 : M o b i l e a n
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CHAPTER 17 Emergency and Portable A
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C h a p t e r 1 7 : E m e r g e n c
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Antennas for Other Frequencies Part
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CHAPTER 18 Antennas for 160 Meters
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C h a p t e r 1 8 : a n t e n n a s
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CHAPTER 19 VHF and UHF Antennas The
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C h a p t e r 1 9 : V H F a n d U H
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CHAPTER 20 Microwave Waveguides and
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C h a p t e r 2 0 : M i c r o w a v
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λ o = c / f 8 3× 10 m / s = 9 C h
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CHAPTER 21 Antenna Noise Temperatur
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C h a p t e r 2 1 : A n t e n n a N
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C h a p t e r 2 1 : A n t e n n a N
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CHAPTER 22 Radio Astronomy Antennas
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C h a p t e r 2 2 : R a d i o A s t
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Figure 22.9 Interferometer pattern.
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CHAPTER 23 Radio Direction-Finding
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C h a p t e r 2 3 : R a d i o D i r
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Figure 23.9 Adcock array RDF antenn
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Figure 23.11 Watson-Watt Adcock arr
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Tuning, Troubleshooting, and Design
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CHAPTER 24 Antenna Tuners (ATUs) Th
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C h a p t e r 2 4 : a n t e n n a T
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CHAPTER 25 Antenna Modeling Softwar
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C h a p t e r 2 5 : A n t e n n a M
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Figure 25.3B Bent dipole wire and s
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CHAPTER 26 The Smith Chart The math
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Figure 26.2 Normalized impedance li
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A Figure 26.3 Constant resistance c
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A Figure 26.4A Constant inductive r
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C h a p t e r 2 6 : T h e S m i t h
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D C B A Figure 26.5 Radially scaled
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0.165 Y ' 1.0 j1.1 G' 1.0 Y ' 0.2
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CHAPTER 27 Testing and Troubleshoot
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C h a p t e r 2 7 : T e s t i n g a
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Mechanical Construction and Install
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CHAPTER 28 Supports for Wires and V
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C h a p t e r 2 8 : S u p p o r t s
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CHAPTER 29 Towers At some point, th
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CHAPTER 30 Grounding for Safety and
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C h a p t e r 3 0 : G r o u n d i n
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CHAPTER 31 Zoning, Restrictive Cove
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C h a p t e r 3 1 : Z o n i n g , R
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C h a p t e r 3 1 : Z o n i n g , R
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Appendices
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APPENDIX A Useful Math The material
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A p p e n d i x A : U s e f u l M a
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Appendix B Suppliers and Other Reso
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A p p e n d i x B : S u p p l i e r
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B.1.6 Rotators and Controllers Alfa
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Index Note: Boldface numbers denote
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I n d e x 747 Binns, Jack, first ma
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I n d e x 749 dipole (Cont.): slopi
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I n d e x 751 grounding and ground
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I n d e x 753 ionospheric propagati
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I n d e x 757 noise (Cont.): sky no
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I n d e x 763 transmission lines, 1
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I n d e x 765 vertically polarized
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I n d e x 767 Yagi antennas (Cont.)
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