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TOWER DESIGN AND CONSTRUCTION CHAPTER 2: SITE DESIGN AND DEVELOPMENT Site Designator 7XXX MSP No 7XXX City NewTown County Charles Phase District Microwave Antenna System Information 3 7 Path No Path Destination Path Radio Antenna Height Space Density Capacity Azimuth Path Distance (CL) Dish Size Diversity FIGURE 2-3 EXAMPLE OF A TYPICAL TOWER LOADING REPORT Tower Type: Self Support Tower Height: 475 Tower Reference Azimuth: 0 Ant. Engineering File Number: Tower Loading Information Diversity Ant. Ht (CL) Polarization 91 7203b high 28 43 14.8 135 6 95 6 66.8 Vertical 88 7302p4 medium 12 121.4 10.6 142 6 102 6 66.8 Vertical 89 7001b high 28 160.605 11 160 6.1 99 6 64.8 Vertical 90 7904p1 High 28 237.145 15.8 125 8 80 6 69.3 Vertical 101 7804c high 28 333.9 11.4 106 6 71 6 66.8 Vertical Site Designator 7XXX MSP No 7XXX City NewTown County Charles Phase District Microwave Antenna System Information 3 7 Path No Path Destination Path Radio Antenna Height Space Density Capacity Azimuth Path Distance (CL) Dish Size Diversity 800 MHz Antenna Information One 800 MHz Rx Ant. Ht: Number of 800 MHz Tx Ants: 445 Mounted at a Height of: 475 Model Number of Antennas: PD100175a NOTES: All Line for the 800 MHz Antenna Systems will be 1 5/8" Heliax 1 5/8" Snap in hanger required for the site. 2 61 Relocated Existing Antenna Systems Loading Requirements Model Number of Antennas: DB212 Mounted at a Height of: 200 Quantity of Antennas: 3 NOTE: All Line for the non 800 MHz Antenna Systems will be 7/8" Heliax If tower is less than 250' mount relocated existing antennas at highest available location. Notes: 1. Compliance with future loading requirements mandates doubling all RF antennas listed above when calculating tower loading. 2. All Microwave Antenna Systems use EWP-63 Elliptical Waveguide. 3. All Microwave Antennas are Solid Dish Antennas with a Solid Molded Radome. 4. EWP63 hangers required at the site. 49 Packs of 10 Tower Type: Self Support Tower Height: 475 Tower Reference Azimuth: 0 Ant. Engineering File Number: Diversity Ant. Ht (CL) 2-24 68P81089E50-B 9/1/05 Div Dish Size Div Dish Size ERIP (dBi) ERIP (dBi) Tower Loading Information Marked (Painted): Medium Intensity White: Dual Medium Intensity (White and Red): High Intensity White: Dual High Intensity (White and Red): Conventional Red Lighting: Requires No Lighting: 21-Dec-99 Polarization Tower Marking and Lighting Requirements 21-Dec-99
STANDARDS AND GUIDELINES FOR COMMUNICATION SITES TOWER DESIGN AND CONSTRUCTION 2.12.7 TOWER CONSTRUCTION Tower construction shall be performed in accordance with the current edition of ANSI/EIA/TIA-222 (or other applicable local Standards body design requirements) or more stringent standard per jurisdiction. Tower construction general requirements are summarized in the following list: • All personnel climbing a tower shall be tied off at all times. • An RF engineer shall perform an RF site compatibility study to determine if any interference might occur with existing frequencies currently in use at the site. • Antenna mounts shall be specified and installed as recommended by the manufacturer. Mounting devices shall be made of corrosion-resistant material. • Qualified personnel certified for the correct installation and safety procedures associated with this type of work shall perform the installation. • The highest point of the antenna and/or lightning dissipater shall not exceed the licensed height. 2.12.8 TOWER TRANSMISSION CABLES Transmission line installation requirements are summarized in the following list: • Tower lighting cables shall not be bundled along with transmission lines or other conductors anywhere within cable ladders, or the building interior. • Each transmission line run shall have entry port boots (inside and/or outside), lightning protectors and associated mounting brackets, and any additional jumpering required by the site specific RF configuration. Some manufacturers provide transmission line kits, which include the main line connectors, top and bottom jumpers, line grounding kits (typically three per line), hoist grips, and weatherproofing materials. • If the installation requires transmission lines that use air or nitrogen as the dielectric material between the conductors, a dehydration system shall be installed to maintain optimum humidity of the dielectric. • Strain relief devices shall be used a minimum of every 60.8 m (200 ft.) during transmission line installation and shall remain in place to support the cable after installation. A support cable should be used between the grips to prevent damage to the transmission line caused by lifting from only one point. • Coaxial cable transmission lines shall be bonded and grounded in accordance with Chapter 4, “External Grounding (Earthing).” • To minimize the formation of condensation and ice on transmission lines, a drip loop should be created at the point where the direction of the transmission lines changes from vertical to horizontal. (Figure 2-4). To lessen the likelihood of moisture on the cables getting into the shelter, the cables should be installed with a slight upward incline as they approach the shelter. 68P81089E50-B 9/1/05 2-25
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© 2005 MOTOROLA, INC. ALL RIGHTS R
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TABLE OF CONTENTS Chapter 1. Introd
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STANDARDS AND GUIDELINES FOR COMMUN
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CHAPTER 5 INTERNAL GROUNDING (EARTH
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CHAPTER 6 POWER SOURCES 6 6.1 LOCKO
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CHAPTER 7 SURGE PROTECTIVE DEVICES
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CHAPTER 8 MINIMIZING SITE INTERFERE
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CHAPTER 9 EQUIPMENT INSTALLATION 9
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APPENDIX A ELECTROMAGNETIC ENERGY I
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APPENDIX B SOIL RESISTIVITY MEASURE
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APPENDIX C PROTECTING AGAINST ELECT
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APPENDIX D GROUNDING (EARTHING) ELE
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APPENDIX E GENERAL CONVERSIONS AND
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APPENDIX F R56 COMPLIANCE CHECKLIST
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I NDEX Index Index AC power cabling
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