Chapter
11
Hardware
Installation Check
11-5
11.7 Checking Primary Feeder Cables and GPS Feeder Cables
Check if:
1. The primary feeder cables are cut by a dedicated cutter. The cross-section is
smooth and no copper scraps are left in the copper pipe of the primary feeder
cable. The connectors of the primary feeder cables are installed firmly.
2. The 7/8” feeder cable connectors are installed firmly to ensure normal standing
wave ratio.
3. The feeder cables are grounded at least three times as required (Refer to 6.2.3.1).
The grounding points are connected firmly and sealed well. The end of the cable
grounding kit for connecting the grounding cable is downward so that rainwater
will not flow into the feeder cable along the grounding cable.
4. One feeder cable grounding kit is installed in the middle of the tower if the
tower is more than 60m high.
5. One lightning grounding kit is installed on the top of a building or on the cabling
rack if the length of the feeder cable after leaving the tower before entering the
equipment room is more than 20m.
6. The terminals of the feeder cable grounding kit are fixed separately onto the
tower.
7. The outdoor grounding copper busbar is connected with the underground
grounding net by the dedicated cable whose cross-section area is more than
50mm
2
.
8. The antenna feeder system on the top of a building is connected to the nearby
lightning grounding net.
9. The cabling ladder for leading the feeder cable from the building top along the
wall to the equipment room is grounded.
10. The inclination between the feeder cable and its grounding cable is less than 15°.
11. The feeder cables are laid neatly, neither cross-connected nor broken or twisted.
The connections with the sectors are correct.
12. The minimum bending radius of feeder cables is 20 times of the semi-diameter
of feeder cables or more. The bending radius of the primary feeder cables is
larger than 0.3m.
