Codan Radio Radio Repeater Systems Training Guide - Manual (Page 9)

RADIO REPEATER SYSTEM | TRAINING GUIDE
Chapter 1: Repeater System Basics Page 1
CHAPTER 1: REPEATER SYSTEM BASICS
Guidelines to Plan and Implement a Simple, Effective and Reliable Radio Communications System
INTRODUCTION
This document will familiarize you with radio system design, focusing on repeaters and base stations.
This document gives you the basics to design simple radio systems. Professional help should be
obtained for more complex radio system designs.
Radio signals operate over line-of-sight paths. This implies that you must be able to see the radio
with which you wish to communicate. Actually, contact between radios slightly beyond line-of-sight
distances are often possible, owing to refl ection or refraction of the radio waves. Physical restrictions
of signal paths between radio users (such as mountains or buildings) can disrupt system operation.
Figure 1-1 shows the line-of-sight signal paths between the portables and from the portables to the
base station at the offi ce. At far right, note the restriction of signal path between the mobile and the
offi ce caused by the hill.
Figure 1-1: Line-of-Sight Signal Paths
Portables
Mobile Office