Obstructions And Blind Sectors; Transceiver Height Implications - Simrad R3016 12U/6X Installation Manual

12
Other RF sources
The radar antenna should be installed at a safe distance from interfering high-power energy
sources and other transmitting and receiving radio antennas.
Sensitive equipment
Some electronics such as GPS and electronic heading sensors may be particularly sensitive to
radar emissions. Follow the manufacturers guide on suitable separation distances. Avoid
having such equipment directly in the beam of the radar.

Obstructions and blind sectors

The antenna should be mounted clear of any structure that may cause signal reflections and
resultant blind sectors. Large flat metallic structures perpendicular to the radar generally
cause the worst reflections, and should be avoided.
Railings
The underside of the radar antenna should be a minimum of 50 cm above any safety rail.
Swing diameter
Ensure all obstructions are clear of the rotation of the antenna (see "Up-mast transceiver and
antennas" on page 37). To avoid the antenna coming in contact with other installed objects
while it is rotating, ensure that there is at least 200 mm between the swing circle (turning
radius) and the other installed objects.
Blind sectors
It should be kept to a minimum, and not occur in an area of the horizon from right ahead to
22.5° abaft the beam to either side. Any two blind sectors separated by 3° or less should be
treated as one combined blind sector. Individual blind sectors of more than 5°, or a total of
blind sectors of more than 20°, should not occur in the remaining area abaft the
aforementioned area. For radar installations with two radar systems, where possible, the
antennas should be placed in such a way as to minimize the blind sectors.
Distance to water surface
For all radar systems and where practical, a line of sight from the radar antenna to the bow of
the ship should hit the surface of the sea at no more than 500 m or twice the ship length,
depending which value is smaller. This goes for all load and trim conditions.
l

Transceiver height implications

The following table indicates the effect of mounting height of antenna on the distance
before the beam hits the water.
Height 1
(m)
Distance 4.7
(m)
Height (m) 15
Distance 70.6
(m)
Installation overview | R3016 12U/6X Installation manual
< 2l
< 500 m
2 3 4
9.4 14.1 18.8
20 25
94.1 117.6
5 7.5
23.5 35.3
30 40
141.1 188.2
10
47.0
50
235.2