Antennas And Cabling; Figure 3: Omnidirectional And Directional Antenna Performance Characteristics - ABB GW100 User Manual

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A NT EN NA S A ND CA BLI NG

4.4

Antennas and Cabling

The single most important item affecting radio performance is the antenna system. Consider

carefully this part of an installation, or the performance of the entire system will be compro-

mised. Quality high gain antennas should be used at all stations. The antennas should be

specifically designed for use at the intended frequency of operation and with matching im-

pedance (50 ohm).

Antennas are made by several manufacturers and fall into two categories – omnidirectional

and directional (see

sponse in all directions and is, therefore, appropriate for use at master stations which must

communicate with an array of remote stations scattered in various directions. Omni-anten-

nas should also be used where clients will be mobile.

At remote fixed stations, a directional antenna, such as a Yagi, is typically used. Directional

antennas confine the transmission and reception of signals to a relatively narrow beam

width, allowing greater communication range and reducing the chances of interference from

other users outside the pattern. It is necessary to aim these antennas in the desired direction

of communication (i.e., at the master station).

The end of the antenna (farthest from support mast) should face the associated station. Fi-

nal alignment of the antenna heading can be accomplished by orienting it for maximum re-

ceived signal strength.

2 2

Figure

3). An omnidirectional antenna provides equal radiation and re-

WIRE LES SHART SYS TEM PLA NNI NG

3B NP 10299 2 B

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