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2- -4 Wedge Wedge U-bolt U-bolt and nut 28-21 Making a mast mounted to a fence post
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Installing vertical antennas 565 the less costly material (which is only marginally less costly than the best) will warp and ruin the installation within 1 year The 2 4 is attached to the fence post using U-bolts A 2 4 scrap is used as a wedge to take up the difference between the post and the mast In some installations the U-bolt will go around the perimeter of the 2 4, whereas in others a pair of holes will be drilled in the 2 4 to admit the U-bolt arms The U-bolt must be at least 1 4in no 20 thread, and either a 5 16-in bolt or a 3 8-in bolt is highly recommend if the mast supports any significant weight Some installers like to place a brick at the base of the 2 4 This support bears the static and dynamic loads (ie, gravity and wind) that eventually would cause the mast to list because of the eccentric loading on the footer The auxiliary purpose is to keep the butt end of the 2 4 off the ground and thereby prevent rot Some additional mechanical stability might be afforded by replacing the brick with a cinder block that is filled with concrete Another approach is to install a pressure-treated 4 4 of the sort used to support decks (Fig 28-22) Hardware stores and lumber yards sell the specially treated 4 4 posts and the concrete for the footers These footers are dropped onto a gravel bed at the bottom of a hole (see the preceding section for a discussion of how deep the hole must be) A typical deck footer has a plastic or heavy-duty metal mount to support the 4 4 After the footer and mount are installed, the hole is backfilled with soil Some people prefer to backfill, at least to a point above the mount, with builder s gravel (of the same sort as used beneath the concrete footer), or concrete can be used for maximum stability
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Antenna towers are used extensively in amateur and commercial radio communications systems for a very obvious reason: Antennas tend to work better at altitude than on the ground Amateur operators tend to install 30- to 100-ft towers, although the 40- and 50-ft models probably predominate for practical (and in some areas
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566 General antenna mechanical construction techniques legal) reasons Local laws vary considerably, from one area to another Be sure to consult the bureaucracy before erecting a tower In my own area, a 30-ft tower that is physically attached to a two-story house does not need a permit or inspection (but must be constructed according to certain regulations), although anything mounted away from the house (or at a height greater than 30 ft, if attached to the house) requires a permit and the usual mechanical inspection The law requires that an inspection be performed when the hole for the footing is completed and 4 in of gravel is on the bottom The inspector will take a yardstick and measure both the depth of the hole and the depth of the gravel A final inspection is performed when the antenna is installed Prior to all this mess, a permit must be obtained (which means drawings submitted) Several different types of towers are used by amateurs Some are square-base designs, and others are triangular-base designs At least one commercial model is a round pipe that has a rotator at the base In this model, the entire tower turns when the antenna is rotated Several tower configurations are seen commonly Figure 28-23 shows the fixed form of tower This type of tower costs the least, and a case can be
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