Cambium Networks PMP/PTP 450i Series, User Manual

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Chapter 2: System hardware Installing a GPS receiver
Page 2-48
Mounting the GPS receiver module on a metal tower or mast
If mounting the GPS receiver module on a metal tower or mast ( Figure 31 ), select a position that meets the
following requirements:
•
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 UGPS receiver (following manufacturer’s instructions) upon either an external wall ( Figure 30 ) or a metal
tower or mast (Figure 31).
Figure 26 GPS antenna mounting
System hardware
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 28 . .