SRT X-BAND RADAR SYSTEMS
INSTALLATION
304202P003 8.5 Rev. C
8.3 Installation
8.3.1 Installation Principles
In order to obtain the best radar performance and accessibility, the following
precautions should be used:
− Space for the antenna to swing freely. See par.8.2 (Specifications;
Antenna type
)
− Safety and easy access for maintenance purposes. It is preferable to use
a platform on the ship mast.
− Figure 2 (Suggested Masthead Antenna mounting)
− The antenna to be accessible in all directions
− Avoid exposure to exhaust fumes from the funnel
− Avoid strong vibrations
− Avoid interference between two antennas
− Avoid obstacles in the radar beam, especially ahead of athwart ships
directions
If two radar sets are installed, their antennas should be installed on different
levels.
The antennas can be mounted, either on a single mast construction, so they are
on top of each-other, as illustrated in Figure 2 (Suggested Masthead Antenna
mounting) or the antennas can be mounted on a platform, Figure 3 (Suggested
Antenna mounting), one on portside and one on starboard side.
The following formula and drawing, as illustrated in Figure 4 (Antenna
Positions), will help you to determine the correct distance and height between
the two radar antennas. The 45° angle on the drawing is the actual vertical
beam-width with a safety margin included.
Example:
“H = L”,
H = height between the two antennas
L = the distance between the two antennas
If the distance L is 6m, then the height should be = 6m.
Blind sectors towards the bow and within a few degrees on port and/or
starboard side caused by the structure of the ship must be avoided with great
care. In case of a blind sector at the bow in mid-ships’ position, it is advisable to
mount the antennas on the starboard side of the ships’ keel-line.
When obstacles are sufficiently far from the antenna, they will result in a blind
sector on the radar display with approximately the same amplitude as observed
by the human eye, but these obstacles can produce false echoes. An echo
produced by an obstacle close to the antenna, can be suppressed by reflecting
the antenna-beam skywards by mounting a reflector made of metal, as also
illustrated in Figure 2 (Suggested Masthead Antenna mounting). This solution
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