Codan-radio Radio Repeater Systems Training Guide Manuel d'utilisateur télécharger pdf (Page 21)

RADIO REPEATER SYSTEM | TRAINING GUIDE

Chapter 2: Repeater System Conﬁ gurations Page 13

Microwave equipment can be used to link repeaters together instead of radio links as shown in Figure

2-5. E&M is the typical standard used to interface the microwave with the repeater. With this type of

system your site locations are limited to sites where a leased microwave channel is available.

Figure 2-5: Microwave Linked System

Dual-tone, multi-frequency (DTMF) equipment can be added to your repeater(s) to disable its operation

until it is activated by the mobile or base station as shown in Figure 2-6. In this way linking frequencies

are not used until needed, reducing power consumption and possible interference.

Figure 2-6: DTMF Controlled Link System

Without connecting the drops to the links via DTMF, mobile (A) and (B) (above) can communicate with

each other but not to mobile (C). Once both link repeaters are connected to their drops, all three can

communicate with each other.

Drop

repeater

Tx-F3

Rx-F4

Tx-F1

Rx-F2

Interface Interface

Drop

repeater

Microwave

system owned

by others

Microwave

system owned

by others

Mobile (A) Mobile (B) Mobile (C)

Link

Repeater

DTMF

Drop

Repeater

Link

Repeater

DTMF

Drop

Repeater

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 87 88

Pas de commentaire

Codan-radio Radio Repeater Systems Training Guide Manuel d'utilisateur Page 21