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Codan-radio Radio Repeater Systems Training Guide Instrukcja Użytkownika Strona 20

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TRAINING GUIDE | RADIO REPEATER SYSTEM
Chapter 2: Repeater System Confi gurationsPage 12
Figure 2-4 represents a Y confi guration. Star and Y confi gurations use repeating links as the center
site. Note that the drop repeater frequencies at (A) and (D) are the same. As the system expands,
three pairs of drop frequencies are usually adequate for re-use. Terrain will often provide enough
separation between mobiles using the repeaters so that interference between them is not an issue.
The strongest signal will normally be captured by the closest repeater. Note also that the antenna on
the repeating link at (C) will probably have to be multi-directional.
Figure 2-4: Y Linked Confi guration System
To / From Mobiles and
Base Stations
To / From Mobiles and
Base Stations
Drop
Repeater
Switched link
Repeater
Tx-F1
Rx-F2
Tx-F3
Rx-F4
Drop
Repeater
Switched link
Repeater
Tx-F3
Rx-F4
Tx-F5
Rx-F6
Repeating
link Repeater
Drop
Repeater
Tx-F4
Rx-F3
Tx-F7
Rx-F8
Drop
Repeater
Switched link
Repeater
Tx-F1
Rx-F2
Tx-F3
Rx-F4
(A) (B)
(C)
(D)
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