WIRELES SHART S YSTEM PLA NNING
ANTENNAS A ND CAB LING
3BNP1029 12 C
21
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 spe-
cifically designed for use at the intended frequency of operation and with matching imped-
ance (50 ohm).
Antennas are made by several manufacturers and fall into two categories – omnidirectional
and directional (see
. An omnidirectional antenna provides equal radiation and re-
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.
Figure 3: Omnidirectional and directional antenna performance characteristics
Summary of Contents for AWIN GW100
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