User's Manual Part 1

Earth Ground Cabling – continued
Jun 2004
4-49
1X SC480 BTS Hardware Installation, Optimization/ATP, and FRU
DRAFT
Figure 4-31: Grounding Location on BTS
GROUND SCREW
HOLES
P/O BTS RF Panel
GROUND LUG
M6 SCREWS
Outdoor Grounding
Considerations
cCLPA
The cCLPAs are designed to mount directly to the antenna tower. They
have primary lightning protection on all terminations. There is a ground
stud provided to connect the unit to the tower. If the cCLPAs are not
mounted on the tower, they should be mounted as close as possible to an
antenna ground system connection. All interconnect cables should be in
conduit or solid shield RF cables.
PDE
The Primary PDE is the master ground point for all the outdoor
equipment. This Primary PDE should be mounted within 2 meters of
the master ground connection of the antenna ground system. The
secondary PDE should be mounted within 1 meter of the primary PDE
and single point grounded to the same master ground point.
Compact BTS and TME
The Compact BTS and TME and all other outdoor expansion hardware
should be located within 5 meters of the primary PDE. They are all to
be single point grounded to the system master ground. All these
expansion enclosures are insulated from ground through their respective
mounting brackets. All interconnect cables should be in conduit or solid
shield RF cables. It is recommended that these cables be run in
raceways to reduce the loop dimensions of the cable runs. This
minimizes the effect of inducted currents caused by the intense
electromagnetic field of lightning current.
Antennas
The Compact BTS is being installed at an antenna site that has a proper
ground system for the antenna. Proper ground connection points are also
available for the cCLPA and PDE units.
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