Installation Manual – Antenna & Feeder System Installation
BTS3802C & RRU
Chapter 3
Installing GPS Antenna & Feeder System
3-11
z The antenna-side lightning arrester is installed inside the lightning arrester box,
with its connectors sealed with semiconductor adhesive tape, waterproof
adhesive tape and insulating adhesive tape in sequence, so as to prevent
moisture invasion:
z The "PROTECTED" end of the equipment-side GPS lightning arrester faces the
mini NodeB. In this case, the duplex adapter is required so that the arrester can
be connected with the set-top GPS port directly. The equipment-side lightning
arrester does not require any lightning protection grounding wire;
For Type iS-MR50LNZ+6 lightning arrester:
z The two connectors on the two ends of Type DGXZ+6NFNM-A lightning arrester
are respectively male and female, therefore jumpers with male and female
connectors should be available for the installation of antenna-side lightning
arrester. The male connector is connected with the GPS antenna, while the
female connector on the other end is connected male connector of the antenna-
side lightning arrester;
z The antenna-side lightning arrester should not be grounded either installed on
the tower or on building top, but the feeder grounding clip should be close to the
antenna-side lightning arrester as much as possible;
z The antenna-side lightning arrester is installed inside the lightning arrester box,
with its connectors sealed with semiconductor adhesive tape, waterproof
adhesive tape and insulating adhesive tape in sequence, so as to prevent
moisture invasion;
z The installation is completed once the equipment-side GPS lightning arrester is
connected with the set-top GPS port. The equipment-side lightning arrester does
not require any lightning protection grounding wire.
Caution:
When the distance from the antenna to the mini NodeB is greater than 100 meters, 7/8 feeder should be
adopted so as to minimize signal loss. In this case, one end of the equipment-side antenna is connected
with the GPS port on NMCU, while the other end is connected with the 7/8 feeder via jumper. This
jumper has a female and a male connector respectively on its ends.
3.10 Binding Jumpers
Jumpers should be bound at the outside of the antenna support lever evenly using
cable ties. In addition all cable ties should be fastened, with a same spacing of
200mm. The direction of the cable tie heads should be consistent. When cutting the
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