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99-145912-A Chapter 3: Installation 3-13
3.2.7 Interference from radar, GPS and other transmitters
Mount the ADU as far away as possible from the ship’s radar and high
power radio transmitters, because they may compromise the ADU
performance. RF emission from radars might actually damage the ADU.
The SAILOR 100 GX ADU itself may also interfere with other radio
systems.
Radar
It is difficult to give exact guidelines for the minimum distance between
a radar and the ADU because radar power, radiation pattern, frequency
and pulse length/shape vary from radar to radar. Further, the ADU is
typically placed in the near field of the radar ADU and reflections from
masts, decks and other items near the radar vary 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°, you can avoid the worst interference 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 100 GX ADU. Therefore it is recommended to ensure as
much vertical separation as possible when the SAILOR 100 GX ADU has
to be placed close to a radar antenna.
Do not place the ADU close to interfering signal sources or
receivers. For allowed distances to other transmitters see Figure
3-13: Recommended distance to transmitters (m) for
frequencies below 1000 MHz on page 3-15. We recommend
testing the total system by operating all equipment
simultaneously and verifying that there is no interference.
Figure 3-12: Interference with the vessel’s radar
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