Site preparation
3-4 Chapter 3: Installation 98-133966-G1
3.2.2 Obstructions (ADU shadowing)
Place the ADU so that it has as much free line-of-sight 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 3-1: Signal degradation because of obstructing objects
Note
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.
SAILOR900TM.book Page 4 Monday, September 16, 2013 11:01 AM
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