GE MDS entraNET 900, Техническое руководство

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05-4055A01, Rev. E MDS entraNET Technical Manual 153
Invisible place holder
Figure 6-4. DIN Rail Mounting Details for GE MDS Equipment
6.1.4 Antenna and Feedline Selection
Antennas
The equipment can be used with a number of antennas. The antenna type
used depends on the physical size and layout of a system. Contact your
GE MDS representative for specific recommendations on antenna types
and hardware sources.
In general, an omnidirectional antenna ( Figure 6-5 on Page 154 ) is used
at the AP station site. This provides equal coverage to all of the remote
sites.
NOTE:
Antenna polarization is important. The wrong polarization
causes a signal reduction of 20 dB or more. Most systems
using a gain-type omnidirectional antenna at the AP station
employ vertical polarization (elements oriented perpendicular
to the horizon) of the signal; therefore, the Remote antenna(s)
must also be vertically polarized.
Horizontally polarized omnidirectional antennas are also
available. Contact your GE MDS representative for details.
Step 1: Attach the bracket using the
Step 2: Snap the assembly onto the
DIN rail. To remove the radio,
the two screws provided. (Attach to
pull down on the release tab.
the end opposite the connectors.)