KVH Industries TracPhone FB250 Installation Manual page 24

Chapter 2: Installing the system
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 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 antenna at a different level – meaning that the
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
TracPhone antenna. Therefore it is recommended to ensure as much vertical
separation as possible when the TracPhone antenna has to be placed close to
a radar antenna.
Min. 15°
Min. 15°
Placing the antenna 11