Codan Radio Radio Repeater Systems Training Guide - Manual (Page 17)

RADIO REPEATER SYSTEM | TRAINING GUIDE
Chapter 2: Repeater System Confi gurations Page 9
CHAPTER 2: REPEATER SYSTEM CONFIGURATIONS
DETERMINING CONFIGURATION
Radio system confi guration is dependant on the frequencies available, location of repeater sites and
the end user’s operating requirements. Two frequencies are required for a single repeater system.
These frequencies are designated as F1 and F2. The separation between these two frequencies
determines the size of the duplexer used in the repeater.
Figure 2-1: Two Frequency Repeater
The repeater in Figure 2-1 shows an ineffi cient use of frequencies and would exhibit some unwanted
characteristics. For example, if the repeater went “off the air” users would not be able to communicate
with each other since all units are transmitting on one frequency and receiving on another frequency.
Portable
Repeater
Office
Tx-F1
Rx-F2 Tx-F1
Rx-F2
Rx-F1
Tx-F2