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70
Chapter 3
Installation
3
Radar interference
It is difficult to give exact guidelines for the minimum distance
between radar and the SAILOR FleetBroadband antenna because
radar power, radiation pattern, frequency and pulse length/shape
vary from radar to radar. Further, the antenna is typically placed
in the near field of the radar antenna and reflections from 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 SAILOR
FleetBroadband antenna at a different level – meaning that the
SAILOR FleetBroadband antenna 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 FleetBroadband antenna. Therefore it is recommended
to ensure as much vertical separation as possible when the
SAILOR FleetBroadband antenna has to be placed close to a
radar antenna.
Radar distance
Figure 3-10: SAILOR FleetBroadband radar distance
The minimum acceptable separation (
d
minimum) between a radar
and the SAILOR FleetBroadband antenna 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-band and S-band. If the
d
minimum separation listed below is applied, antenna damage is
normally avoided. “
d
minimum” is defined as the shortest distance
between the radar antenna (in any position) and the surface of the
SAILOR FleetBroadband antenna.
Summary of Contents for Sailor 250 FleetBroadband
Page 1: ...FleetBroadband Installation Training manual Commissioning and On Board repair ...
Page 2: ......
Page 4: ......
Page 9: ...Inmarsat Network ...
Page 10: ......
Page 34: ...24 1 Chapter 1 Inmarsat Network Figure 1 34 Return direction connection bearers ...
Page 36: ......
Page 37: ...Product Presentation ...
Page 38: ......
Page 70: ......
Page 71: ...Installation ...
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Page 107: ...97 SAILOR FleetBroadBand Training Manual 3 ...
Page 108: ......
Page 109: ...Interfaces ...
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Page 132: ......
Page 133: ...Repair ...
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Page 165: ...155 SAILOR FleetBroadBand Training Manual 5 Figure 5 59 ...
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Page 187: ...Removal Replacement ...
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Page 217: ...207 SAILOR FleetBroadBand Training Manual 6 ...
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Page 219: ...Software Upload ...
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Page 221: ...211 SAILOR FleetBroadBand Training Manual 7 Figure 7 1 ...
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Page 231: ...System Test ...
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Page 237: ...Abbreviation ...
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Page 255: ...245 SAILOR FleetBroadBand Training Manual 10 ...
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