Cambium Networks PMP 450 AP, Планирование и руководство по установке

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Chapter 2: System hardware Installing a GPS receiver
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• It must not be mounted any higher than is necessary to receive an adequate signal from four GPS
satellites.
• It must be protected by a nearby lightning air terminal that projects farther out from the tower than
the GPS receiver module.
Mounting the GPS receiver
Mount the GPS receiver (following manufacturer’s instructions) upon either an external wall ( Figure 49 )
or a metal tower or mast ( Figure 50 ).
Figure 45 GPS antenna mounting
Procedure 1 Mounting the GPS receiver
1 Ensure that the mounting position
• has an unobstructed view of the sky to 20º above the horizon.
• is not the highest object at the site. (The GPS antenna does not need to be
particularly high on a site, which would give it more exposure to lightning. It just
needs to have an unobstructed view of the sky.)
•
is not further than 100 feet (30.4 meters) of cable from the CMM.
2 Select a pole that has an outside diameter of 1.25 to 1.5 inches (3 to 4 cm) to which the
GPS antenna bracket can be mounted.
3 Place the U-bolts (provided) around the pole as shown in Figure 47 .
4 Slide the GPS antenna bracket onto the U-bolts.
5 Slide the ring washers (provided) onto the U-bolts.
6 Slide the lock washers (provided) onto the U-bolts.
7 Use the nuts (provided) to securely fasten the bracket to the U-bolts.
Please refer to the PMP Synchronization Solutions User Guide located on the Cambium website
(
http://www.cambiumnetworks.com/resource/pmp-synchronization-solutions ).