Site Requirements
When choosing a location for the Mobile Station:
•
Avoid objects like masts, poles or even bigger structures in the direct vicinity or in front of the
antenna; the Artemis positioning system requires free line of sight between the antennas of
the two stations.
•
Avoid mounting the antenna unit in a position in which its antenna is in the same horizontal
plane as the ship’s radar antenna.
For permanent installations the ideal mounting position is on top of the vessel’s main mast. It is
advised to fit a small platform directly under the mounting bracket to ease installation and service.
The distance between the platform and the mounting bracket should be at least 0.8 m to be able
to remove the bottom cover from the antenna unit.
For temporary installations other mounting positions can be considered.
If the system is used at short ranges, the Mobile Station and the Fixed Station or Beacon should
be at roughly the same height. An exception here is a Beacon with a horn antenna. Since the
horn antenna is looking down by 30°, the Beacon may be in a substantially higher position than a
Mobile Station.
!
Do not mount the antenna unit too close to the mast. The antenna must be able
to turn around freely without bouncing off the mast or other obstacles.
Mounting the Mobile Station
!
Take measures to prevent falling down from the mast or other heights. Use a safety
harness.
The antenna unit should be mounted:
•
On a torsion-free stand or bracket.
•
In a position where the antenna has preferably 360° around free line of sight.
The antenna unit can be mounted in a ’U’-shaped bracket with three holes. The U-shape allows
the unit to be slid in the bracket, rather than lowering it from above. In this way it takes less effort
to install the antenna unit.
See
on page 13 for the dimensions of a ‘U’-shaped mounting
bracket.
Installing a Mobile Station
!
To avoid damage to the antenna it is strongly recommended to mount the antenna unit in
its bracket without the antenna, and mount the antenna afterwards.
To mount the antenna unit in the bracket.
1. Slide the antenna unit in the mounting bracket.
Note:
There is only one position in which the antenna unit fits in the bracket. This is the position
where the connectors are facing when standing in front of the ’U’-shaped cut-out of the bracket.
2. Mount the antenna unit with three M8 bolts. Place a washer between the bolts’ head and
the mounting brackets of the unit. Use spring washers to secure the nuts. Preferably use
stainless steel bolts, washers and nuts.
To Mount the antenna unit:
3. Position the antenna such, that the red mark on the antenna shaft of the antenna unit and the
red mark on the flange of the antenna are aligned.
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