Site preparation
2-4
2.2.2 Obstructions (ADU shadowing)
Place the ADU so that it has as much free line-of-sight as possible without any structures
in the beam through one full 360 degrees turn of the vessel. Do not place the ADU close
to large objects that may block the signal. To avoid obstruction elevate the ADU by
mounting it on a mast or on a mounting pedestal on a deck or deck house top.
The ADU is stabilized in 3-axis (plus skew) and can be used in environments with
elevations of -25° to + 125° to allow for continuous pointing even in heavy sea
conditions.
The ADU beam is approximately 1 m in diameter for the first 30 m from the ADU.
Beyond 30 m the beam gradually widens so that it is approximately 5 m in diameter at
100 m distance. This beam expansion continues with increasing distance.
Any obstructions, such as masts, funnels, bridge house etc. within this field can cause
signal degradation or signal loss.
Figure 2-1: Signal degradation because of obstructing objects
Please note that due to the short wavelength at Ku band and
the narrow beam width of the ADU even a 6 mm steel wire
placed within 50 m inside the beam can causes signal
degradation.
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