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Installing the Antenna Grounding Wire
Warning!
1) The ground wire must be located at least 1.8 m (6 feet) away from
lightning rods, or antennas should be bonded to the lightning protection
system.
2) Prior to attaching the ground wire, apply a non-oxidizing agent, such as
“NO-OX”, to both mating surfaces.
3) The antenna lightning ground wire must be 5 mm
2
(#10 AWG) copper wire
or larger.
4) Ground wires from the antenna and ground block may run inside the
building, but they must be grounded at the nearest accessible location.
5) Ground wire for lightning protection must be taken from the CPE to earth
ground in as straight a line as practicable.
RTU Grounding Variations
If an RTU is mounted to a platform attached to the main building lightning protection system, attach a lightning
ground wire from the lugbolt on the antenna (see
) to the RTU foot.
If an RTU is mounted to a platform that is NOT attached to the main building lightning protection system, connect
the lightning grounding wire to the antenna lugbolt (see
) and then to the grounding rod outside the
building at ground level.
Routing the Coaxial Cables
Warning!
The RTU must be visually aligned to the Node before coaxial cables are
connected and power is applied to the NIU. This prevent unnecessary
exposure to RF radiation and DC voltage in the cables.
1.
For cable runs less than 61 m (200 ft) use RG-11 cable. RG-6 cable may be used for runs less than
46 m (150 ft). Use Commscope 5786 for RG-6 cable, Commscope 5918 for RG-11 cable or equivalent. The
center conductor supplies DC power. The RG-6 cable selected must have solid copper-center conductor
instead of a copper-plated steel center conductor.
2.
Route the two antenna cables from the RTU to the point the cable enters the building. Allow extra cable for drip
loops and leave enough slack in the cable to rotate the RTU assembly and align it with another Node, should
that become necessary.
3.
Mark both ends of one cable “TX” and the ends of the other cable “RX”.
4.
Route RG-6 cables up through the mast and the top of the post clamp at the top (see
). Route RG-11
cables along the outside of the mast and secure with tie wraps.
5.
Mount a grounding block at the point of building entry according to the manufacturer’s instructions.
