Site preparation
98-133966-G1
Chapter 3: Installation
3-13
3333
Installation
masts, decks and other items in the vicinity of the radar are different
from ship to ship.
However, it is possible to give a few guidelines. Since a radar radiates a
fan beam with a horizontal beam width of a few degrees and a vertical
beam width of up to +/- 15°, the 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 (below approximately 10 m) between radar antenna and
the SAILOR 900 VSAT ADU. Therefore it is recommended to ensure as
much vertical separation as possible when the SAILOR 900 VSAT ADU
has to be placed close to a radar antenna.
3..2.7.2
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 ADU.
Figure 3-11: Interference with the vessel’s radar
X-band (~ 3 cm / 10 GHz) damage distance
Radar
power
SAILOR 900 VSAT 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
Table 3-5: Minimum radar separation, X-band
Min. 15°
Min. 15°
Radar
SAILOR900TM.book Page 13 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
Page 2: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 2 15 04 2013 15 54 39 ...
Page 28: ...List of tables xxvi 98 133966 G1 SAILOR900TM book Page xxvi Monday September 16 2013 11 01 AM ...
Page 257: ...Appendices SAILOR900TM book Page 1 Monday September 16 2013 11 01 AM ...
Page 258: ...SAILOR900TM book Page 2 Monday September 16 2013 11 01 AM ...
Page 355: ...98 138976 A Cover_SAILOR 900 VSAT System_407090B indd 3 15 04 2013 15 54 40 ...