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05-4055A01, Rev. E
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Figure 6-5. Typical Omnidirectional Antennas
At remote sites, and for radios in point-to-point LANs, a directional Yagi
(
Figure 6-6
) antenna is generally recommended to minimize
interference to and from other radio systems. Antennas are available
from a number of manufacturers.
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Figure 6-6. Typical Yagi Antenna
(mounted to mast)
NOTE:
It is essential that all antenna systems incorporate appropriate
lightning protection. Information on lightning protection and
grounding considerations can be obtained from the Polyphaser
Corporation (
www.polyphaser.com
). The firm’s Web site
offers free engineering notes, as well as information on
lightning protection devices.
Feedlines
Carefully consider the choice of feedline used with the antenna.
Poor-quality coaxial cables should be avoided, as they degrade both
transmission and reception. Keep the cable as short as possible to
minimize signal loss.
High-gain Type
Unity-gain Type
Содержание MDS entraNET 900
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