Specifications

154 GE MDS entraNET Reference Manual 05-4055A01, Rev. D
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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 inter-
ference 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 light-
ning protection devices.
Feedlines
The choice of feedline used with the antenna should be carefully consid-
ered. Poor-quality coaxial cables should be avoided, as they degrade
both transmission and reception. The cable should be kept as short as
possible to minimize signal loss.
High-gain Type
Unity-gain Type