Site preparation
3-14
Chapter 3: Installation
98-150471-A02
The separation distance for C-band (4-8 GHz) radars should generally be the same as for S-
band radars.
Radar interference
Even at distances greater than “d min.” in the previous section the radar might still be able
to degrade the performance of the SAILOR 900 VSAT High Power 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 Ku-band connection. The degradation will be most significant at
high radar pulse repetition rates.
As long as receiving conditions are favourable, this limited degradation is without
importance. 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 experimentally
before the installation is finalized.
GPS receivers
Good quality GPS receivers will work properly very close to the ADU - typically down to one
meter outside the main beam.
S-band (~ 10 cm / 3 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
2.0 m
1.0 m
30 kW
3.0 m
1.5 m
50 kW
5.0 m
2.5 m
Table 3-6: Minimum radar separation, S-band
CAUTION!
The ADU must never be installed 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.
SAILOR900HP.book Page 14 Monday, July 18, 2016 12:44 PM
