User's Manual

30 kW S-BAND/U ANTENNA GROUP
INSTALLATION
8.5 Rev. C
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 Position),
will help you to determine the correct distance and height between the two radar
antennas. The 25° angle on the drawing is the actual vertical beam-width with a
safety margin included.
Example:
“H=L/3”,
H = height between the two antennas
L = the distance between the two antennas
If the distance L is 6m, then the height should be 6/3 = 2m.
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 mounting). This solution however
does not eliminate the blind sector, but will reduce false echoes produced by
the obstacle. The best position for the reflector can be found by testing out
different positions.
It is highly recommended that the shipyard submit the drawings of the radar
antenna position(s) to the Manufacturer for approval.
The Installation consists of following basic steps:
- Mount the Antenna Pedestal without the antenna on the
mast
- Make relevant cable connections
- Install and connect the Performance Monitor arm
- Install the Safety Switch
- Mount the Antenna on the Antenna Pedestal