Overview

This book explores Radio Access Networks (RANs) within LMR systems, comprising base stations, mobile radios, and hand portable radios. These components facilitate communication among end users via a network of fixed base stations, antennas, and combining systems strategically placed across radio repeater sites throughout the coverage area. This resource also delves into the consequences of interference, highlighting the painstaking efforts required to diagnose and rectify interference issues through field testing and redesign. The central focus being on the design intricacies of base station antennas and combining systems at densely populated shared radio repeater sites. The book underscores how to identify potential sources of interference from co-located transmitters and receivers, effectively surveying sites to anticipate high-level interfering signals. This critical information forms the foundation for crafting base station antenna and combining systems that curtail interference, subsequently optimizing coverage and minimizing costs. Throughout its pages, the book lays out a detailed roadmap for designing LMR systems resilient to interference. By outlining essential principles and methodologies, the book guides practitioners in creating LMR networks that flawlessly align with end users' communication requirements. The resulting systems not only meet expectations but surpass them, offering the coverage area and communication quality demanded by public safety and utility organizations during critical operations. Ultimately, the book serves as an indispensable resource for engineers, designers, and professionals engaged in crafting LMR systems capable of delivering impeccable performance and reliability.

Full Product Details

Author:   Ian Graham
Publisher:   Artech House Publishers
Imprint:   Artech House Publishers
Edition:   Unabridged edition
Dimensions:   Width: 16.10cm , Height: 1.90cm , Length: 23.50cm
Weight:   0.644kg
ISBN:  

9781685690250

ISBN 10:   1685690254
Pages:   280
Publication Date:   31 December 2023
Audience:   Professional and scholarly ,  Professional & Vocational
Format:   Hardback
Publisher's Status:   Active
Availability:   In Print  
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Table of Contents

Chapter 1 – Repeater Site RF Systems Overview 1.1 Single Channel Duplexed System 1.2 Multi-Channel System   Chapter 2 – Surveying the Sites 2.1 Site Survey 2.2 Tower Mapping 2.3 RF Surveys 2.4 Tower Structural Survey   Chapter 3 – Essential Background 3.1 Noise in RF Systems 3.1.1 The Behaviour of Noise in RF Systems 3.2 Intermodulation   Chapter 4 – Sources of Interference at Shared Radio Sites 4.1 Transmitter Harmonics 4.2 Transmitter Sideband Noise 4.3 Transmitter Intermodulation 4.4 Receiver Blocking 4.5 Receiver Intermodulation 4.6 Minimising Site Interference by Antenna Placement and Frequency Planning   Chapter 5 – Antennas and Site Antenna Systems 5.1 The Isotropic Radiator 5.2 Antenna Specifications 5.3 Omni Directional Antennas 5.4 Directional Antennas 5.5 Down Tilt 5.6 Calculating the Isolation between Antennas on a Radio Tower: 5.7 Antenna System Topology 5.8 Site Antenna System Design Rules   Chapter 6 – Calculating the Interference Threshold 6.1 Calculating the Initial Receiver Sensitivity 6.2 Adding the Effect of Site Noise 6.3 Calculating the 1dB Interference Threshold 6.4 Accounting for Multiple Interference Mechanisms 6.5 Re-Calculating the Final Receiver Sensitivity 6.6 Summary   Chapter 7 – Duplexers 7.1 Types of Duplexers 7.2 Specifying Duplexer Design Requirements 7.3 Duplexers and Passive Intermodulation   Chapter 8 – Transmitter Combining Systems 8.1 Isolators 8.2 Cavity Filters 8.3 Types of Transmitter Combiner 8.4 Specifying Transmitter Combiner Design Requirements 8.5 Differences for Duplexed Multi-Channel Systems 8.6 Site Transmitter Combiner Design Rules   Chapter 9 – Receiver Multicoupling Systems 9.1 Receiver Sensitivity 9.2 Types of Receiver Multicoupler 9.3 Use of Tower Top Amplifiers in Receiver Multicouplers 9.4 Correctly Setting the Gain of Receiver Multicoupling Systems 9.5 Calculating Receiver Filter Requirements 9.6 Differences for Duplexed Multi-Channel Systems 9.7 Site Receiver Multicoupler Design Rules   Chapter 10 – Power and Antenna System Monitors 10.1 Power Monitors 10.2 Antenna System Monitors   Chapter 11 – Transmission Line Systems 11.1 Transmission Line Systems for Multi-Channel Site RF System Designs 11.2 Transmission Line Systems for Single Channel Duplexed RF System Designs 11.3 RF Surge Suppression Devices 11.4 Transmission Line Grounding Devices   Chapter 12 – Design Example 12.1 Information Gathering 12.2 Antenna System Design 12.3 Calculating the Interference Threshold 12.4 Transmitter Combiner Design 12.5 Receiver Multicoupler Design 12.6 Antenna System Monitor 12.7 Transmission Line System 12.7.1 RF Surge Suppression Devices 12.7.2 Transmission Line Grounding Devices 12.8 The Finished Design

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