Huawei iSiteC BTS3601C Installation Manual page 21

Installation Manual
iSiteC BTS3601C CDMA Base Station
Figure 3-25 Installing the directional antenna on the tower side
I. Installation requirements
When installing the directional antenna on the tower, make sure the antenna is in
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the protection range of lightning arrester on the tower. The antenna should stretch
out of the tower body for at least 1m.
Waterproof elbow must be made to the antenna jumper.
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II. Installation procedure
1) Determine the installation direction of the antenna according to the engineering
installation drawing.
2) Fix the antenna onto the main supporting post. The fixing tightness should be right
enough for weight bearing and wind resistance. Looseness may cause loose
connection while too much tension may damage the antenna sheathing;
3) Adjust the antenna azimuth angle: Determine the antenna azimuth angle with a
compass according to the engineering design documents. Normally, Starting from
the north clockwise, the area covered by the first antenna is sector 1. Sector 2 lies
in the clockwise 120° direction and sector 3 in the next clockwise 120° direction, as
shown in Figure 3 -26. While adjusting the azimuth, turn the antenna azimuth
slightly till it satisfies the design index value with the azimuth error not greater than
5°.
3 Installing RF Antenna and Feeder System
3-20
Hardware Installation