Site preparation
3-12
Chapter 3: Installation
98-137654-A
3.2.6 Interference
The ADU must be mounted 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.
3.2.6.1 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 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 between radar
antenna and the SAILOR 100 Satellite TV ADU. Therefore it is
recommended to ensure as much vertical separation as possible
when the SAILOR 100 Satellite TV ADU has to be placed close to a
radar antenna.
Note
Do not place the ADU close to interfering signal sources.
For allowed distances to transmitters see Figure 3-11:
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.
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