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4 Select the correct antenna for the conditions Where the antennas may experience severe tropical storms as in, for example, the Caribbean during the hurricane season, even 200 mph (320 km/hr) survival wind speed antennas should be considered 5 If the antenna will be sited in a marine or corrosive environment, consider specifying a corrosive environment in addition to the highwind antenna In general, mean wind speed increases with height above ground This variation corresponds to the relationship: H VH V10 33
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where VH and V10 are the mean wind speed at H height and 10 m (33 ft) above ground, respectively, computed over 3 secs and with recurrence of 50 yrs The factor p varies from about 01 to 04, according to the terrain A value of 017 is frequently used, although it applies only to flat terrain with few trees or obstructions (see Table 65) The numbers in Table 65 are provided for illustration purposes only and should not be used for actual design; familiarity with local topography and climatic conditions in the specific area are required to determine the antenna wind loading and/or erect the new telecommunications towers From the antenna loading prospective, it is important to keep in mind that the wind energy is proportional to the cube of its speed, which means that doubling the wind speed increases its energy by a factor of eight Although they are at the same geographical location, antennas placed at two different heights on the same tall tower do not necessarily have to have the same wind rating Wind gusts result mainly from the roughness of the Earth s surface and are accentuated when the air flows over buildings and other obstacles Gusts may also be caused by temperature convection currents
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Wind Speed Above the Ground Wind Speed (mph) 25 30 34 36 38 40 50 60 68 73 76 79 75 91 102 109 115 119 100 121 136 146 153 159
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Height (Feet) 33 100 200 300 400 500
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The data for extreme wind speed in gusts is normally measured over a minimum period of three seconds, ie, peak wind for three seconds For brief intervals the maximum speed may be higher Although the mean wind speed may be relatively low, the maximum wind speed seen in a gust will be considerably higher, typically 50 percent higher for a five-second gust in open country
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65113 Effect of Ice on Antenna Performance Ice affects the performance of all antennas to some degree, and the problem gets more serious the higher the frequency The feeder in an antenna transforms electromagnetic signals into electromagnetic waves radiating into free space The impedance of free space is 377 If the air immediately surrounding the feeder is replaced by ice, which has lower impedance than air, then the impedance match and radiation patterns of the antenna will change These changes become progressively worse as the ice loading increases Parabolic dish antenna elements are usually protected by a radome This provides an air space between the elements and ice casing so that the lower impedance of the ice layer has only a small effect on the radiators Detuning is greatly reduced, but radiation pattern distortion may still be encountered (detuning reduces usable antenna bandwidth) For a given ice thickness, deviation from usual performance values become worse as frequency increases In areas where severe icing and wet snow are common, it is recommended to install a full radome over solid parabolic antennas, and stay away from grid antennas of any type
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General Types of Maps
There are three general types of maps: planimetric, topographic, and orthophoto Planimetric maps show the positions of features without showing their relationship to the hills and valleys of the land Examples of features on planimetric maps include rivers, lakes, roads, and boundaries Planimetric maps include:
Common road maps, including road atlas and city maps Speci c area maps, including replan maps, oor plan maps, storm drain maps, sewer and water system maps Schematic maps, including agency maps and aviation maps
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