Codan Radio Radio Repeater Systems Training Guide - Manual (Page 10)

TRAINING GUIDE | RADIO REPEATER SYSTEM
Chapter 1: Repeater System Basics Page 2
To extend this coverage, a radio repeater or a repeater system is required as shown in Figure 1-2. A
repeater is nothing more than a radio or combination of radios connected in such a way that it simply
passes on or “repeats” anything that it hears.
Figure 1-2: Repeater for Extended Coverage
When the distance becomes too long, or the coverage provided is too restricted for a single repeater,
more repeaters are added as shown in Figure 1-3. By establishing a series of repeater sites, a chain
can be linked together to provide radio coverage over a large area. Unfortunately, every time a signal
is “repeated”, some of the quality is lost, thus the number of repeaters that can be linked together in
any one line is limited.
Figure 1-3: Repeaters Linked Together
There are many steps to designing a radio system, even a simple repeater system. First, the frequencies
and frequency bands to be used must be determined. The coverage area required by the radio
system must then be decided, and from that, the location of the site(s) should be chosen. The system
confi guration will be dependant on the location of the sites and the requirements of the end user. The
equipment (repeater, duplexer, antenna, batteries, etc.) must be determined and then installed and
tested. The operation of the radio system will depend on the end user, the location and amount of sites,
and the coverage area.
Mobile
Repeater
Portable
Portable
Portable
Repeater 1 Repeater 2
Office