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8.8 Installing antennas
The following recommendations apply to all antenna installations:
– Install the antenna in an open area as far away as possible from any obstacles such as
buildings, dense deciduous forest or metal objects. Select a location that ensures a free
signal path in the direction of the partner antenna.
– If two antennas are located in the same place, the distance between them should be at
least 0.6 m in the vertical direction and 1 m in the horizontal direction. In the case of
868 MHz wireless systems, the required minimum distance should be even greater as
the transmission power is higher.
– Make sure that you select the correct antenna characteristics at both ends of the wire-
less path. You can also combine omnidirectional antennas and directional antennas.
– Note the polarization of the antenna. Most systems use a vertically polarized omnidirec-
tional antenna at the master station. The partner antennas must therefore also be
polarized vertically. Vertical polarization means that the elements are aligned vertically
to the horizon. Crossing polarization between the stations results in signal loss (see
Table 8-4).
Figure 8-6 Antenna polarization
WARNING: Explosion hazard when used in potentially explosive areas
Observe the installation instructions for the antenna and the Section “For your safety” on
page 7.
NOTE: Malfunction
– The wireless module must be located at a distance of at least 3 cm from the installed
antenna.
– Observe the installation instructions from the antenna manufacturer to ensure that the
directional antennas or omnidirectional antennas will function properly.
Table 8-3 Antenna characteristics
Antenna Comparable to ...
Omnidirectional antenna Light bulb
Directional antenna Flashlight
Powerful directional antenna,
e.g., Yagi or parabolic antenna
Laser pointer
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