Installation Manual – Antenna & Feeder System Installation
BTS3802C & RRU
Chapter 3
Installing GPS Antenna & Feeder System
3-3
result will be obtained. The visual angle of the vertical antenna should be larger
than 90
0
. As shown in Figure 3-2.
(2)
(1)
(1)
≥
90°
(1) Surrounding buildings or other obstacle
(2) GPS antenna
Figure 3-2
Installing antenna
z
Note that the antenna should not be close-range radiated by the front face of the
main lobe of the mobile communication antenna. In addition, it should not locate
at the range of the microwave signal from microwave antenna, not below the
high voltage cable and not under the intense radiation of TV launching tower.
z
In view of the lightning protection, try to install the antenna in the center of the
roof. Be sure not to install the antenna in the corner at the roof, as the corner is
the most possibly subject to the lightning stroke.
z
The antenna should be installed at the place where there is special lightning rod
or similar facilities such as the tower for telecommunication around. And the
antenna should locate within the valid protection range of the lightning rod. That
is, the included angle between the erect direction and the cable that connects the
receiving connector of the antenna to the lightning rod or tower-top should be
less than 30°. If there is no tower or lightning rod around, the special lightning
rod should be installed to meet the design requirements for lightning protection.
The horizontal distance from the lightning rod to the antenna should fall within
2~3m preferably. And the height of the lightning rod should be more than 0.5m
higher than that of GPS antenna receiving connector.
3.4 Installing Antenna Stand on Iron Tower
3.4.1 Requirements of Iron Tower
z
If installed on the iron tower, the GPS antenna should be positioned at the
bottom of the iron tower. The farther it is from the high-power antenna at the iron
tower top, the better result it yields.
z
The antenna is fixed using the antenna stand to avoid the interference of the iron
tower body.
