Telenetics OM-AMPS-100 manual Types of External Antennas, Directional Antenna

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Section 5

External Antenna Guidelines

cell site might be farther away, the fact that the signal is coming from a different direction might avoid natural or man-made obstacles that blocked the signal from reaching the previous antenna location.

Types of External Antennas

The following sections describe the various external antennas that can be used with OMEGA.

Directional Antenna

A directional antenna is usually best for a fixed installation. The signal from this type of antenna is focussed in one direction. Directional antennas can be designed to have different beam widths –– wide, medium, or narrow. The narrower the beam width, the higher the antenna’s gain.

Directional antennas must be pointed directly at the cell site. We recommend you use directional antennas designed to provide the maximum E.R.P. allowed by FCC regulations and EIA standards. Contact the cellular carrier in your area to determine the exact location of the nearest cell site.

To install a directional antenna:

cFind the location of the nearest cell site that services your area.

cAttach the antenna to the appropriate connector on the OMEGA unit, making sure the connection is secure.

cPoint the antenna toward the cell site.

cMake sure the bars on the antenna are positioned vertically.

cMake sure that the antenna perimeter is clear of objects, especially metal ones, that might interfere with the signal transmission and reception.

Elevated Feed 3dB Gain Antenna

Elevated feed antennas are designed to handle most cellular installations. There are a number of different ways to mount the antenna that will result in adequate signal strength for data applications in most area. Note that this type of antenna does not require a ground plane.

50	OMEGA Installation, Operation, and Maintenance Manual

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Contents OMEGA Page Table of Contents Using the Configuration Program Specifying a Default Port Anti-streaming Command Summary Table of Contents Preface Product OverviewFigure P-1. Omega Application Ancillary Documentation Preface Installation Contents Hardware Features IntroductionSelecting a location for installing Omega Finding a Suitable LocationUnpacking Installing OmegaAvoiding Hazards Required Materials and Tools Mounting OmegaMounting Omega Mounting an AntennaConnecting the Input Voltage Source Connecting an Input Voltage Source Connecting the Endpoint Device Powering Up Omega LEDVerifying the Cellular Transceiver Unit Call Origination TestingOperating Omega Activating Your Cellular TransceiverCall Answer Testing Contents Troubleshooting Contents Troubleshooting Checking the Main Power SupplyReinitializing Omega Checking the Battery VoltageChecking the Antenna Specifications Specifications Operation Modem InterfaceBattery Operation Cellular Transceiver InterfaceSwitches and LED Indicators Power SupplyEnvironmental Specifications Mechanical SpecificationsConnectors Agency Compliance EMI/RFISection Specifications Section Using Configuration Program Section Using the Configuration Program Prerequisites Getting Started Reading the Cellular Telephone Signal COM Port PromptExample of Signal Bar Programming a Telephone NumberChanging the Login Password Entering the Cellular Telephone’s SIDExiting the Configuration Program Section External Antenna Guidelines Section External Antenna Guidelines High Voltage Areas RF SignalGeneral Guidelines GainDistance from the Antenna to the Closest Cell Site Antenna PlacementExternal Antenna Selection Criteria Degrees of Down-tilt on the Cell Site Antenna ArrayDistance from the Antenna to Omega Cable for Connecting the Antenna to OmegaElectrical Interference Height Above Ground Level of the AntennaElevated Feed 3dB Gain Antenna Types of External AntennasDirectional Antenna Determining the Best External Antenna Location Contact InformationSection External Antenna Guidelines Appendix a Port Expansion Module Option Appendix a Port Expansion Module Option Package Contents Field InstallationFirgure A-1. Sliding the Module into the Card Guides Figure A-2. Connecting the RJ-11 Jacks Time Delay Method Automatic Connection Testing the Module PortsConnecting Endpoint Devices Example Atdt 19495552468,,,4 Enter Second Dial Tone Method Manual ConnectionSpecifying a Default Port Anti-streaming Command Summary To… Do the Following…Appendix B Warranty Compliances Appendix B Warranty & Compliances BWarranty and RMA Statement Limitations FCC Part 15 Statement FCC StatementFCC Interference Statement Comments About This Manual Index Index