Site considerations
98-175666-C
Chapter 2: Installation
2-14
Interference from radar, GPS/GNSS receivers, L-band antenna and other
transmitters
Even at distances greater than “d min.” in the previous section the radar might still be
able to degrade the performance of the SAILOR XTR GX-R2 system. The presence of
one or more S or X-band radars within a radius up to 100 m may cause a minor
degradation of the Ka band connection. The degradation will be most significant at
high radar pulse repetition rates.
As long as receiving conditions are favorable, this limited degradation is not
important. However, if receiving conditions are poor – e.g. due to objects blocking the
signal path, heavy rainfall or icing, low satellite elevation and violent ship movements
– the small extra degradation due to the radar(s) could cause poor connection quality.
The presence of S-band radar(s) is unlikely to cause any performance degradation – as
long as the minimum distances (d min.) listed in the previous section are applied.
It is strongly recommended that interference-free operation is verified before
the installation is finalized.
X-band (~ 3 cm / 10 GHz) damage distance
Radar
power
SAILOR XTR GX-R2 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 2-8: Minimum radar separation, X-band
S-band (~ 10 cm / 3 GHz) damage distance
Radar
power
SAILOR XTR GX-R2 ADU
d min. at 15° vertical
separation
d min. at 60° vertical
separation
0 – 10 kW
2.0 m
1.0 m
30 kW
3.0 m
1.5 m
50 kW
5.0 m
2.5 m
Table 2-9: Minimum radar separation, S-band
CAUTION!
Never install the antenna closer to a radar than “d min.” -
even if experiments show that interference free operation
can be obtained at shorter distances than “d min.” in the
previous section.
