Справочник Пользователя для Acurix Networks Pty Ltd RX-4002-02
RX INN Installation Guide
Page: 11
Mounting an antenna away from the INN installation site, i.e. behind structure
or lower down a wall can effectively negate the presence of interfering signal
enough to operate a significantly better radio link. Low loss cable types are
used to provide flexibility in antenna placement.
or lower down a wall can effectively negate the presence of interfering signal
enough to operate a significantly better radio link. Low loss cable types are
used to provide flexibility in antenna placement.
Antenna Alignment
The orientation of the antenna can be the difference between a solid reliable high
performance link and a signal that is unusable. Always remember:
performance link and a signal that is unusable. Always remember:
The antennas on a link should be pointing towards each other. Each antenna
has a 3dB main beamwidth of 45
has a 3dB main beamwidth of 45
–
48 degrees and is circularly polarised. The
person installing the antenna should ensure that if a signal were to emanate
from one of the antenna (the source antenna) at 23 degrees on either side of the
centre line of the antenna cone, the target antenna would be inside that 46-
degree area (when viewed from the source antenna) on both a horizontal and
vertical plane. The same set up must occur with the other antenna.
from one of the antenna (the source antenna) at 23 degrees on either side of the
centre line of the antenna cone, the target antenna would be inside that 46-
degree area (when viewed from the source antenna) on both a horizontal and
vertical plane. The same set up must occur with the other antenna.
In a RoamAD network, it is typical that other RoamAD radios nearby have the
potential to cause significant interference on any specific radio. The installer
must therefore ensure that RoamAD antennas are deployed in such a fashion
as to not splash signal around an area unnecessarily or overlap beams. Unless
the antenna is required to cover an area of the building far above it, each
antenna should be installed with a
potential to cause significant interference on any specific radio. The installer
must therefore ensure that RoamAD antennas are deployed in such a fashion
as to not splash signal around an area unnecessarily or overlap beams. Unless
the antenna is required to cover an area of the building far above it, each
antenna should be installed with a
–
10 to
–
25 degree orientation to the
horizontal plane, i.e. pointing towards the ground slightly. This enables most of
the usable signal to be targeted into areas where it is needed while eliminating
unwanted signal into other areas, that may cause some interference.
the usable signal to be targeted into areas where it is needed while eliminating
unwanted signal into other areas, that may cause some interference.
In some situations a link of maximum strength can be made by pointing both
antenna cones directly at each other or by pointing one or both of the cones
away by 23 degrees and using the outer edge of the main beam to make the
connection.
antenna cones directly at each other or by pointing one or both of the cones
away by 23 degrees and using the outer edge of the main beam to make the
connection.
For coverage radios, the antenna should be installed to provide maximum LOS
to the target area if possible. If the target area is NLOS, then the antenna should
be installed with at least 30 m of clear space between it and the first
obstruction, and where possible the signal should enter the obstruction on two
faces. As an example, rather than placing an antenna where its direction of
signal would be perpendicular to a building wall, it is recommended that the
antenna is aligned to face the corner of a building.
to the target area if possible. If the target area is NLOS, then the antenna should
be installed with at least 30 m of clear space between it and the first
obstruction, and where possible the signal should enter the obstruction on two
faces. As an example, rather than placing an antenna where its direction of
signal would be perpendicular to a building wall, it is recommended that the
antenna is aligned to face the corner of a building.
Always look at building structure to ensure the radio signal enters the building
at the easiest point, maximising RF penetration and minimising signal
attenuation. Windows and non-structural walls are generally good, metal and
heavily reinforced concrete are not so good.
at the easiest point, maximising RF penetration and minimising signal
attenuation. Windows and non-structural walls are generally good, metal and
heavily reinforced concrete are not so good.
Never shoot an antenna directly into foliage, reflective material, or dense
building structure from a very close range.
building structure from a very close range.
Antenna parapet mounts
Standard antenna mounts are designed for installation on flat surfaces
such as building parapets and vertical walls, providing approximately
360 degree by 180-degree adjustability.
such as building parapets and vertical walls, providing approximately
360 degree by 180-degree adjustability.
In some cases the standard system mount will not be able to provide
clear LOS or achieve the correct orientation so alternative mounts such
as a
clear LOS or achieve the correct orientation so alternative mounts such
as a
‘mast and stay’ type of antenna mount, may be required.