Appendix A Outdoor GPS Antenna Installation
Verizon 4G LTE Network Extender 2 for Enterprise User Guide v1.0
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GPS Satellite Tracking and Position Hold
The survey of an object’s position using GPS satellites is based on triangulation.
Three satellites are enough to survey the position of an object by triangulation.
However, to calculate the correct time deviation, a total of four satellites are
required.
Usually, the GPS antenna is installed in a high place, such as on a roof. It must be
installed away from protruding objects, such as trees or buildings. In addition, it
must be positioned away from any obstacle that covers part of the sky around the
horizon of the building where it is installed.
If it is impossible to ensure a completely open sky, you should install the GPS
antenna facing the equator providing a maximum view of the southern sky
(northern sky in the southern hemisphere).
Furthermore, when installing the GPS antenna using a steel cylinder structure
shared by other RF antennas, it must be separated by more than 1 m from that steel
structure.
Figure 54. GPS Antenna Installation
Lightning Arrestor
A lightning arrestor is required when there is a danger of lightning striking a cable
or related part. The lightning arrestor must be installed in a place where the
antenna cable or set of combined cables enters a building or station, or a place
inside the building or station. The purpose of this is to protect the people and
equipment inside the building or station.
If struck directly by lightning, the lightning arrestor, antenna, or cable must be
replaced. Furthermore, you must inspect the lightning arrestor periodically, and
replace the antenna and cable periodically to ensure protection if lightning occurs
frequently at the site.
The lightning arrestor must be well grounded, so that it can transmit a large current
quickly.
