Site preparation
98-150471-A02
Chapter 3: Installation
3-13
Installation
worst interference can be avoided by mounting the ADU at a different level – meaning that
the ADU is installed minimum 15° above or below the radar antenna. Due to near field
effects the benefit of this vertical separation could be reduced at short distances between
radar antenna and the SAILOR 900 VSAT High Power ADU. Therefore it is recommended to
ensure as much vertical separation as possible when the SAILOR 900 VSAT High Power ADU
has to be placed close to a radar antenna.
Radar distance
The minimum acceptable separation (d min.) between a radar and the ADU is determined
by the radar wavelength/frequency and the power emitted by the radar. The tables below
show some “rule of thumb” minimum separation distances as a function of radar power at X
and S band. If the d min. separation listed below is applied, antenna damage is normally
avoided.
“d min.” is defined as the shortest distance between the radar antenna (in any position) and
the surface of the SAILOR 900 VSAT High Power ADU.
Figure 3-11: Interference with the vessel’s radar
Min. 15°
Min. 15°
Radar
X-band (~ 3 cm / 10 GHz) damage distance
Radar
power
SAILOR 900 VSAT High Power ADU
d min. at 15° vertical
separation
d min. at 60° vertical
separation
0 – 10 kW
1.0 m
1.0 m
30 kW
2.0 m
1.0 m
50 kW
3.3 m
1.7 m
Table 3-5: Minimum radar separation, X-band
SAILOR900HP.book Page 13 Monday, July 18, 2016 12:44 PM
