Codan-radio Radio Repeater Systems Training Guide Manuale Utente Scaricare il pdf (Pagina 30)

TRAINING GUIDE | RADIO REPEATER SYSTEM

Chapter 3: Repeater System EquipmentPage 22

The antennas in Figure 3-2 are “phased dipole arrays” and will provide increased gain in an omni-

directional or offset pattern. They are usually used for local coverage or “drop” purposes.

Figure 3-2: Phased Dipole Array Antennas

dB RE l /2 DIPOLE

0 -10

-5

0 5 10-10-5510

+10°

-10°

+10°

-10°

-10

-5

0 5 10-10-50510

dB RE l /2 DIPOLE

-10

-5

0 5 10-10-50510

Azimuth pattern - OMNI

+10°

-10°

+10°

-10°

-10

-5

0 5 10-10-50510

dB RE l /2 DIPOLE

Vertical pattern - OMNI

FOUR BAY 150 MHz OMNI

dipole array with typical

azimuth and vertical radiation

patterns shown directly below

FOUR BAY 150 MHz OFFSET

dipole array with typical azimuth

and vertical radiation patterns

shown directly below

Vertical pattern - OFFSET

Azimuth pattern - OFFSET

dB RE l /2 DIPOLE

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Codan-radio Radio Repeater Systems Training Guide Manuale Utente Pagina 30