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Special case of the folded dipole 555
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C A 28-11 Center insulator for ribbon cable folded dipole: (A) cable preparation, (B) front/back view, (C) edge view
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556 General antenna mechanical construction techniques the holes In a test, I was able to make the required holes using a hand-operated paper punch, but it required a large force (and turned my hand temporarily purple!) The center insulator is shown in Fig 28-11B It is made from a piece of strong plastic, Lucite, or other insulating material Two identical sections, front and back, are needed A number of 5-mm holes are drilled into both pieces at the points shown to clamp the twin lead A pair of solder lugs is provided to make connections between the antenna element and the transmission line (either twin lead or leads from a balun) The screws and nuts used to fasten the two halves of the insulator are made of nylon to prevent interaction with the antenna A side view is shown in Fig 28-11C Note that the twin lead causes a gap that can catch water It also makes it possible to break one or both insulators by overtightening the nuts In order to prevent this, a gasket of similar material is glued into the space as filler The gasket material should be about as thick as the twin lead If you opt for a balun transformer, then it can be wired to the downleg of the tee insulator using the holes that normally would clamp the twin-lead transmission line An end insulator for twin-lead antennas is shown in Fig 28-12 It is constructed in a similar manner to the center insulator Two scenarios are possible The first, and that used in a test antenna, is to make the clamping fixture from metal such as 3- to 6-mm brass or copper stock The ends of the antenna wires are shorted, so this is not a great problem An end insulator is then used with a rope in the normal manner A chain-link section is used to fasten the clamping fixture and the end insulator I attempted this with a nylon chain link, about 15 25 in, from a do-it-yourself hardware store It was only with a bit of difficulty that the ends were pulled apart, slipped into both the end insulator and the clamping fixture, and then reclosed The second approach is to make the clamping fixture out of the same material as the center insulator It then becomes the end insulator, so the other end insulator and that cursed chain link can be ignored If you opt for this approach, it is a good idea to smooth and polish the rope hole on the clamping fixture to prevent chaffing of the rope
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Masts and other supports for wire antennas
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The end supports of the antenna can be anything that provides height: a mast, a tree, or the roof line of a building Figure 28-13 shows the use of a mast, but either of the other forms of support could be used as well The support rope is not tied off at the
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28-13 Mounting mast schemes
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top, as is true in all too many installations, but rather is brought down to ground level This approach facilitates raising and lowering the antenna for maintenance and tuning Be sure to provide enough dead slack to make lowering the antenna feasible The antenna support rope is connected to a spring on one end and a counterweight on the other end The spring should be stout enough so that it is only slightly extended when the full weight of the antenna places it in tension I have used doorsprings for this task, but only the stoutest varieties The counterweight should be just enough to balance the weight of the antenna and keep it not quite taut As wind moves the antenna up and down, the counterweight raises and lowers, thereby reducing the chances of straining the antenna wires to their limit Any number of counterweights can be used I have seen a number of types: drapery cord weights, a small bucket of rocks, a gaggle of fishing weights, and (in one case) a burned-out automobile starter motor (the mounting hole on the front boss of the motor was ideal for accepting the rope) Figures 28-14A and 28-14B show two methods for making the connections at the top of the mast Although egg insulators are shown here for the sake of fairness (the alternate form was shown earlier), either form can be used A pulley is mounted on the top of the mast with a link section and a stout eyebolt that passes through the mount In the case of a tree, I have used a steel band of the type used to mount TV antennas to house chimneys By making the down rope a closed loop, you gain the
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