11
Installation
Radar
It is difficult to give exact guidelines for the minimum distance between a radar and
the 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 horizontal beam width of a few degrees and
vertical beam width of up to +/- 15
o
, the worst interference can be avoid by mounting
the satellite TV antenna at a different level - meaning that the antenna is installed
minimum 20
o
above or below the radar antenna. Due to near field effects the benefit
of this vertical separation could be reduced at short distance (below approx. 10 m)
between radar antenna and satellite TV antenna. Therefore it is recommended to
ensure as much vertical separation as possible when the satellite TV antenna has
to be placed close to a radar antenna.
SAILOR
®
SAILOR
®
The satellite TV antenna must be mounted as far away as possible from ship’s
radar and high power radio transmitters (including Inmarsat based systems),
because they may compromise the antenna performance. RF emission from radars
might actually damage the satellite TV antenna.
Preferred placing
Avoid if possible
Min 20
o
d
Min 20
o
Chapter 3: Installation
