Cabletron Systems 9033073 manual Antenna Polarization

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Installation Guidelines

Overview of the Outdoor Installation

Antenna Polarization

Radio waves emitting from a Yagi antenna are linear, leaving the antenna in the same plane as the antenna elements.

When the elements are positioned up and down, the radio waves are vertically polarized.

When the antenna elements are positioned left and right, the radio waves are horizontally polarized.

Vertical polarization is standard for the RoamAbout 14-dBi Directional Antenna.

With RoamAbout outdoor antenna products, it does not matter what type of polarization you choose, as long as the antenna at one end of the communications link is mounted in the same plane as the antenna at the other end.

In some cases you might decide to mount the antenna for horizontal polarization. For example to minimize the influence of cross-talk between antennas when:

Multiple antennas are mounted on the same antenna mast.

Your wireless link transmissions cross another radio beam from a neighboring installation.

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Outdoor Antenna Installation Guide

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Contents RoamAbout 802.11 Outdoor Antenna Installation Guide Page RoamAbout 802.11 Outdoor Antenna Installation Guide Page Regulatory Information CanadaOutdoor Antenna Installation Guide Getting Help Your email addressPage Table of Contents Determining Range & Clearance RoamAbout 14-dBi Directional Antenna Page Introduction About This GuideWho Should Use This Guide Installation Guidelines Installing the AntennaOrganization of this Guide Introduction This ChapterAppendix C The Antenna Cabling System Appendix D Calculating Range & ClearanceRoamAbout Outdoor Kit Introduction Installing a RoamAbout Access Point Configuration and ManagementHardware Specifications Finding Additional InformationAdditional files on your diskettes Other Sources of InformationPage Installation Guidelines Site PrerequisitesPre-Installation Checklist Overview of the Indoor InstallationIndoor Installation Overview Selecting the Right RoamAbout PC CardRoamAbout PC Card Identification Installation Guidelines Placement of the RoamAbout Access Point Installation Guidelines Placement of the Lightning Protector Antenna Cable RouteInstallation Guidelines Overview of the Outdoor Installation Antenna Mast/Wall Bracket not included in kitAntenna Placement Potential Obstacles for a Directional Antenna Antenna Mast/Wall Bracket Tripod MountWall Side Mount Antenna Mast RequirementsGrounding System RoamAbout AntennasAntenna Polarization AP Manager Point-to-Point Diagnostics Screen Antenna AlignmentAntenna Cable Routing Before Climbing the Roof Page Determining Range Clearance Fresnel ZoneDetermining Range & Clearance Other Considerations Page Installing the Antenna Planning the Antenna InstallationSafety Precautions Electrical Hazard WarningsElectrical Hazard Warnings Installation Overview Mounting the Antenna Mounting the Directional AntennaMounting on a Mast Prevent damage to the plastic antenna mounting base Mounting on a Flat Surface Mounting the Omni-directional Antenna Mounting the 14-dBi Antenna to a WallMounting the Omni-Directional Antenna to a Mast Connecting the Antenna Cable Installing the Antenna Sealing the Cable Connectors Contents of the Antenna Box RoamAbout 14-dBi Directional AntennaGeneral Description Table A-1 Specifications 14-dBi Directional Antenna RoamAbout 14-dBi Directional AntennaRoamAbout 7-dBi Omni Directional Antenna RoamAbout 7-dBi Omni-Directional Antenna Selecting the Correct Connector Type Antenna Cabling SystemOutdoor Cabling Components Table C-1 Selecting the Correct N-Type Connector Antenna Cabling SystemOutdoor Cabling Components RoamAbout Cable Assembly Table C-2 Cable Assembly SpecificationsTable C-3 Lightning Protector Specifications RoamAbout Lightning ProtectorInstallation Figure C-1 Lightning Protector InstallationRoutine Maintenance Table C-4 Cable Specifications for the 6m 20 ft Antenna Low-Loss Antenna CableTable C-5 Cable Specifications for the 15m 50 ft Antenna Table C-6 Cable Specifications for the 22m 75 ft AntennaPage Calculating Range Clearance IntroductionDynamic Range Budget Table D-1 Dynamic Range FCC MBit/s Omni-Directional 7-dBiTable D-2 Dynamic Range ETSI. France & Japan Link speed versus Range Determine Line-of-Sight ClearanceTable D-3 Minimum Clearance for Maximum Range Dynamic Range Minimum Clearance Maximum RangeCalculating Range & Clearance Determine Typical Range Table D-4 Actual Clearance and Typical Range Which Antenna do You Need