Chapter
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6-5
In the case the antenna feeder system is installed on the roof top, the grounding
wire of the grounding clip should be led close to the building lightning
protection grid.
4. Before installing the grounding clip, wrap the grounding wire at the grounding
clip end that is close to the grounding wire copper sheet with the waterproof
adhesive tape, as shown in Fig. 6.2-3. This can improve the sealing effect and
prevent the rain from falling into the feeder interior along the grounding wire.
Fig. 6.2-3 Wrapping the Grounding Wire of the Grounding Clip with Waterproof Tape
5. Clamp the feeder external conductor with the grounding wire copper sheet and
the locking spring plate, so that the grounding wire copper sheet and the feeder
external conductor are fully meshed.
6. Take the following steps to conduct the waterproof treatment to the joint of the
grounding clip and the feeder:
1) First wrap the waterproof adhesive tapes and then wrap the PVC tapes.
2) To wrap the waterproof adhesive tapes, apply them layer by layer from bottom
to top first, then from top to bottom once again, and finally from bottom to top
thrice, that is, wrap three layers of them. During the process, make sure the
upper layer overlaps the lower layer by about half the width of the tapes.
7. The grounding end of the grounding clip can be connected to the main tower
body or the outdoor cabling rack (connected to the lightning protection grid of
the building) on the roof top. Remove paint and oxide within the radius of about
13mm at the connection place, and cover the clean area with antioxidant to
ensure good electric contact. When the grounding end is connected, paint
another coat of antirust paint.
8. Before the main feeder enters the room, the grounding end of the grounding clip
can be connected to the outdoor grounding bar.
