SATEL-EASy+
User guide
Version 1.33
82
polarised antennas there must be a good attenuation of the back lobe. In addition to this the
interfering radiator should be situated behind the antenna.
When a system does not demand the use of an Omni-directional antenna it is recommended
that directional antennas are used e.g. two-element Yagi’s in permanent external installations.
Please note that as antenna amplification increases the setting of the direction of the antenna
requires more attention.
Base stations in high places should be supplied with High-Q cavity filters. Please note that the
higher the base station antenna, the larger the coverage area and in turn that the risk of
interference is also increased.
SATEL recommends the use of a band-pass filter with a large Q in the antenna cable of the base
station.
Example of an antenna installation: Long connection distances can be realised by using
directional and/or amplifying antennas (G=Gain) and by installing the antenna high from the
ground to avoid ground obstacles and overcome earths curvature. Very high distances can be
achieved with careful antenna, mast height and cable designing.
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