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Volumes have been written on wire antennas Indeed, many of my antenna books spend a lot of space on the topic What seems to be missing in many books is details on the mechanical aspects of wire antenna construction and installation Although some books cover the mechanical details, much is often missing Let s take a look at some of the basics
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Wire antennas come in a bewildering variety of forms, but for our purposes, the standard model is our old friend the half-wavelength horizontal dipole (Fig 28-3) The overall length (A) in meters is found from 144/FMHz Each element (B) is onehalf the overall length, or 72/FMHz The antenna s nominal feedpoint impedance at resonance is 73 , so it is a good match to standard 75- coaxial cable It is common practice to use a 1:1 balun transformer at the feedpoint in order to balance currents and keep the pattern according to textbook predictions
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It was once common (but poor) practice to strip a few centimeters of coaxial cable, part the braid and center conductor, and connect them to each side of the dipole We could then wonder why the darn thing fell down in the next wind storm Even if you elect to not use the balun transformer, a ready-made center insulator is a must Figure 28-4A shows a common form of center insulator for use with dipoles and other wire antennas There is an SO-239 UHF coaxial connector on the bottom to accept the feedline and two eyebolts mounted with solder connectors for the antenna elements on the sidewalls At the top is a small eyebolt that is used to strain-relieve the system, or to hang it from a center support (as when inverted-V dipoles are built) A larger form of center insulator is shown in Fig 28-4B The enlarged down section indicates that this device contains either a 4:1 or 1:1 impedance ratio balun
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transformer The 1:1 size is recommended for ordinary dipoles, whereas a 4:1 unit is used for folded dipoles and certain other wire antennas Connections to the device, whether straight center insulator or balun form, are shown in Fig 28-5 For simplicity, only one side is shown (the other side is identical) The elements (B in Fig 28-3) typically are made of no 12 or no 14 antenna wire The best wire is stranded and is copper-clad steel core wire (Copperweld) The end of the antenna wire is passed through the eyebolt and then doubled back and twisted onto itself 7 to 10 times The remainder of the wire is then soldered to the terminal Some people prefer to use a separate pigtail wire to connect the antenna element to the solder terminal It is fastened to the antenna element wire between the 7- to 10-turn twist and the eyebolt When preparing the center connector/balun, it is good practice to use steel wool or sandpaper on the solder lug to remove oxidation Oxidation makes it hard to solder and forces you to use too much heat to make a good connection Also, be sure to have a large pair of pliers to crimp the wings of the solder lugs onto the wire Solder assists in making a good connection at the solder lugs, but the crimp should be good enough to do the job The solder then provides corrosion protection Also, tin the 7- to 10-turn twist section with solder This does not increase the strength or provide better electrical connection it is protection against the corrosion that will occur with copper wires Note Use only resin-core solder for antennas! Typical solder is 50/50 or 60/40 lead/tin ratio and may be labeled radio-TV or electronic or something similar Plumber s solder is acid core and will destroy your antenna within a short time after it is erected
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