User's Manual
Table Of Contents
- Chapter 0 - Front Cover
- Chapter 0 - Table of Contents
- Chapter 1 - Introduction
- Chapter 2 - Starting Out
- Chapter 3 - Example Applications
- Chapter 4 - Utilities and Features
- Chapter 5 - Web Configuration Manager
- Chapter 6 - Serial Configuration and Applications
- Chapter 7 - Bridging and Mesh Networking
- Chapter 8 - Antenna Setup
- Apx A - Licensing Information
- Apx B - Interface Ports
- Apx C - Radio Configuration
- Apx D - Security
- Apx E - Troubleshooting
- Apx F - Horizon 2.4 Specifications
- Apx G - Horizon 900 Specifications
- Apx H - Horizon 4.9 Specifications
- Apx I - Horizon 5.8 Specifications
CHAPTER8
ANTENNASETUPS
Revised: 25 Jan 17 8-12 ESTeem Horizon Series
FresnelZone
TheFresnelzoneshowstheellipsoidspreadoftheradiowavesaroundthevisualline‐of‐sightaftertheyleavetheantenna(see
Figure15).Thisareamustbeclearofobstructionsorthesignalstrengthwillbereducedduetosignalblockage.Typically,20%
Fresnel Zone bl
ocka ge introduces little signal loss to the link.Beyond 40% blockage, signal losswill become significant.This
calculationisbasedonaflatearth. Itdoes nottakeintoaccountthecurvatureoftheearth.ItisrecommendedforRFpathlinks
greaterthan7milestohaveamicrowavepathanalysisdonethat take
sthecurvatureofthe earthandthe topographyofthe
terrainintoaccount.
FresnelZoneRadius=72.1SQRT [(d1d2)/(F(d1+d2)]
Units
FresnelZoneRadiusinfeet.
d1andd2instatuemiles
FinGHz
Figure15:FresnelZoneDiagram