User's Manual

Chapter 2 - Hardware Description Installation Preparations
Alvarion BreezeNET B300 15 Technical User Manual
2.3.3 Antenna Poles Usage
Antenna installation is performed on a special facility called antenna pole. The
pole is used for strong antenna tightening at the installation site. Poles might have
different modifications depending on the installation requirements.
2.3.4 Poles with Stretching
Usually this kind of poles are used when installing antenna on a flat surface and
permits one to raise it to a significant height for providing optimal conditions for
signal propagation.
2.3.5 Wall Mounted Pole
Usually these kinds of poles are used when there is no need to elevate antenna to
the rooftop and there is the possibility to mounting it on a wall. This installation is
significantly simpler than that implementation with poles. Mostly it is used for
subscriber side deployments.
2.3.6 Antenna Poles Requirements
Ease of antenna mounting and sufficient mechanical durability should provide
reliable fastening in conditions of high windy loads. Poles should have round
profile for ease of azimuth adjustment. Typical pole diameter is 30 to 50 mm.
2.3.7 Grounding when Using IDU-BS
Antenna should be placed on the mast on the level that is at least 1 meter lower
than a mast's top. In this case it is of big probability that the lightning strikes the
mast and not the antenna. The mast is to be grounded on the grounding contour
according to your local standards. When the lightning strikes the antenna, the
current goes through the coaxial cable which grounds ODU clamp with the mast
- the mast is grounded via the grounding contour. The direct lightning strike to
the STP service cable (ODU-IDU) is partially terminated on the grounded IDU
case. Partial termination means that the direct lightning strike will probably
destroy an STP cable. The service cable pickups from the electromagnetic
impulses are terminated on the IDU case by the winding shield, and further - on
the IDU grounding. IDU is grounded via a three-conductor power cord and a plug
containing a ground. The data & power wires pickups are terminated via IDU
protection scheme (three-conductor power cord and a plug containing a ground).