Site preparation
3-6 Chapter 3: Installation 98-148248-C
3.2.4 Safe access to the ADU (radiation hazard)
The ADU radiates up to 50.4 dBW EIRP, for High Power 53.4 dBW EIRP at 29.5 GHz.This
translates to a minimum safety distance of 30 m, for High Power 44 m, from the ADU while
it is transmitting, based on a radiation level of 10 W/m
2
.
3.2.5 Ship motion and offset from the ship’s motion centre
When installing the ADU you must consider the mounting height carefully. The higher up
the ADU is mounted, the higher is the linear g force applied to the ADU. The g force also
depends on the roll period of the ship, see Table 3-1. If the g force applied is too high,
performance and ADU signal stabilization may be reduced and eventually the ADU may be
damaged. See the following table for allowed mounting heights above the ship’s motion
centre.
Figure 3-4: Radiation hazard, safety distance 30 m or 44 m for High Power
MICROWAVE RADIATION
NO PERSONNEL within safety
distance of 30 m or 44 m for High Power, based on 10 W/m
2
28°
Figure 3-5: Maximum distance from the ship’s motion centre (h max)
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