Practical_Antenna_Handbook_0071639586

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436 P a r t V I : A n t e n n a s f o r O t h e r F r e q u e n c i e s because it allows securing of each parasitic element with a pair of hex nuts, one on either side of the 2- × 2-in boom. Unthreaded elements can be secured with RTV to seal a press-fit. Alternatively, secure the rods with tie wires (see inset to Fig. 19.8): drill a hole through the 2 × 2 to admit the rod or tubing, secure the element by wrapping a tie wire around the rod on either side of the 2 × 2, and solder it in place. Use #14 to #10 solid bare or tinned wire for the tie wires. Mount the mast of the antenna to the boom with an appropriate boom-mast bracket or clamp. One alternative is to use an end-flange clamp, such as is sometimes used to support pole lamps and the like. The mast should be attached to the boom at the center of gravity, also known as the balance point. If you try to balance the antenna on one hand unsupported, there is one (and only one) point at which it is balanced (and won’t tilt end down). Attach the mast hardware at, or near, this point in order to prevent normal gravitational torques from tearing the mounting apart. The antenna is fed with coaxial cable at the center of the driven element. Often, either a matching section of coax or a gamma match will be needed because the usual effect of parasitic elements on a Yagi’s feedpoint impedance is to make it too low to be a good direct match to standard coaxial cable impedances. Halo <strong>Antenna</strong>s One of the more “saintly” antennas used on the VHF boards is the halo (Fig. 19.9), formed by bending a half-wavelength dipole into a circle. The ends of the dipole are connected to the two plates of a capacitor. In some cases, a transmitting-type mica “button” capacitor is used, but more commonly the VHF halo capacitor consists of two 3-in disks separated by air or plastic dielectric. In some implementations of the halo, the spacing of the disks is adjustable via a threaded screw. While air is a good (and perhaps better) dielectric, the use of a plastic spacer provides C mechanical rigidity to help stabilize the exact spacing and, hence, the value of the capacitor. /2 Quad Beam <strong>Antenna</strong>s The quad antenna was introduced in Chap. 13. Although much of the discussion there revolved around implementations for HF, it has, nonetheless, also emerged as a very good VHF/UHF antenna. It should go without saying that the antenna is a lot easier to construct at VHF/UHF frequencies than it is at HF frequencies! Figure 19.10 depicts only one of several methods for building a quad for VHF or UHF. The radiator element can be any Feedpoint Figure 19.9 Halo antenna.
C h a p t e r 1 9 : V H F a n d U H F A n t e n n a s 437 Overall lengths: Reflector: L Director: L 12,562 F MHz 11,248 F MHz Driven element: L 11,826 F MHz in in in Wire or rod A C Glue S S B Notch Figure 19.10 Quad loop construction on VHF. 0111057 FIG 17-13
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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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Figure 2.29C Monthly averaged sunsp
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CHAPTER 3 Antenna Basics An antenna
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C h a p t e r 3 : A n t e n n a B a
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CHAPTER 4 Transmission Lines and Im
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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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C h a p t e r 2 0 : M i c r o w a v
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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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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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C h a p t e r 2 9 : T o w e r s 667
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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 755 maximum effective len
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I n d e x 757 noise (Cont.): sky no
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I n d e x 761 standing waves: on an
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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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