SATELLINE-2ASxE
User Guide, Version 2.0
42
Horizontal polarization
can be used in data transmission between two points. With the
polarization attenuation more distinction is obtained to vertical polarized systems. The influence of
the directional patterns of the antennas must, however, be taken into consideration. If a distinction
to another interfering antenna is wanted with the horizontal polarized 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 omnidirectional antenna it is recommendable to use
directional antennas e.g. two-element yagis in firm external installations. As the antenna
amplification increases the setting of the direction of the antenna demands for a greater care.
The base stations in high places should be supplied with 4...6 degree band-pass filters. Please note
that the higher the antenna the larger the coverage area. The disadvantages of a too high antenna
installation at the base station are that interference from a larger area affects the base station and
that the base station occupies the channel for a too large area.
SATELLINE
5 m
RS-232
Data Terminal
30 m
lowloss
cab le
RS-232
Base Station
Computer
up to 30 km
1 ... n pcs.
1...15 m
Data Terminal
*
*
*
up to 15 km
SATELLINE
SATELLINE
G > 12dBi
G > 6dBi
G > 6dBi
Example of an antenna installation:
By using of directional (amplifying) antennas and by
installing antennas on a high location, long distances can be reached with SATELLINE-2ASxE.
