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28-23 Antenna tower on hinged baseplate
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Installing vertical antennas 567 made for it also being the most stable It is made of 10-ft sections and an 8- to 12-ft top section that contains the thrust bearing for the antenna mast and rotator mounting platform Some fixed towers are self-supporting up to a point, but the use of guy wires is always recommended unless a firm mounting point (against the side of a building, for example) is provided about 18 ft above the surface The fixed tower can be made to tilt over at the base by using a hinged baseplate on the mounting pedestal The tilt-over tower is shown in Fig 28-24 This type of tower uses the same sort of construction as the fixed model but is hinged at a point between one-third and one-half the total height A winch at the base drives a steel wire that is used to raise or lower the tower between fully extended and fold-over positions Still another configuration is shown in Fig 28-25 This type of tower is the slipup variety A wide base section supports a smaller movable upper section A winch is used to lift the upper section into its fully extended position Typical examples will raise from a low position of 20 ft, to a height of 40 ft or so when fully extended (or 20/50 ft) When the tower is fully extended, it is locked into place at the bottom of the upper section with steel bolts A lot of shear force is applied to these bolts, so it is wise to use several very hard stainless steel bolts for the lockdown There is a serious danger inherent in the design of the slip-up tower: the guillotine effect If the upper section comes loose while you are working on it, it will come plummeting down the shaft formed by the lower section and shear off any arms, legs, or other body parts that get in the way Whenever you work on this form of tower, use steel fence posts (or similar pieces of metal) as a safety measure (Fig 28-26); at least two should be used, and both should be attached securely at both ends with
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568 General antenna mechanical construction techniques
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28-25 Slip-up tower Shown cut-away
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rope The purpose of the rope is to prevent the safety pipes from working loose and falling out These pipes are used in addition to, not instead of, the normal bolt fasteners that keep the antenna tower erect The antenna tower, regardless of its configuration, is typically installed on a buried pedestal made of concrete (Fig 28-27) The construction must follow local laws, but there are some general considerations to keep in mind The surface area of the pedestal is 242 to 362 in The top surface is fitted with either a fixed or hinged baseplate (which must be installed before the concrete sets) The depth of the
Installing vertical antennas 569
Steel safety pipes IN ADDITION TO normal fasteners
28-26 Safety precaution
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Gravel 4 Inches 28-27 Ground pedestal
570 General antenna mechanical construction techniques pedestal and the depth of the gravel base tend to reflect the local frost line Regardless of how general local law is, good advice is to make the pedestal at least 28 in deep even if local law permits less Raising the tower can be accomplished by either of two methods, although, in my opinion, only one of them is safe Figure 28-28 shows a method by which the tower is laid out on the ground and then raised with a heavy rope over a high support (such as the peak of the house roof) This method is dangerous unless certain precautions are taken For example, a support must be placed beneath the antenna as it is raised This requirement means that a constantly increasing height of the tower demands a constantly increasing lower support The end-over-end method of raising a tower is shown in Fig 28-29 A gin pole is required for this job The gin pole is a length of pipe fitted with a pulley at the top and a pair of clamps at the bottom The gin pole is clamped onto the top end of the highest section so that it can be used to raise the next 10-ft section into place, where it can be bolted down The gin pole is then raised to the top of the newly installed section, where the operation is repeated again The end-over-end method is preferred by tower manufacturers and is the method recommended by most of them The antenna tower will be most stable if guy wires are installed at appropriate places determined by the tower manufacturer Although many people are inclined to install towers free standing and some towers are advertised as such, it is always good practice to use guy wires attached to at least one point (or more, for tall towers) Use at least four guy wires on a square tower or three on a triangle tower (one in each direction) Figure 28-30 shows two methods for securing the guy wires to the ground One approach is to bury a heavy concrete or metal deadman weight underground Alternatively, use at least one 4- to 6-ft pipe (1 to 15-in in diameter) buried up to a length of 12 to 24 in (18 in is shown in Fig 28-30) Note It is absolutely essential to use safety belts when climbing a tower Use two belts that are completely independent of each other so that no single-point failure can eliminate the belt s function Always keep one belt fastened to the tower; when climbing, unhook one belt and move it up on the tower, and then disconnect the other only when the first is reattached Be sure to inspect the belts prior to use Leather and metal wear out and break, and you do not want to find that failure at 50 ft up Also, do not buy cheap belts
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