Sailor UAIS1900, Technical Manual

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UAIS DEBEG 3400, Electronics Unit
ED3047G142 / 08 (2004-06)
Technical Manual
3 Installation Recommendations
3.2 Specific Recommendations
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3.2.3.1 Recommendations Concerning the Installation of the VHF Antenna
Fig. 3-3 Positioning of the VHF Antenna
The digital signals of the AIS may occur as a periodic clicking sound on a ship’s radiotelephone. This
effect may become stronger when the VHF antenna of the AIS is located near the VHF radiotelephone
antenna and when the radiotelephone is operating on channels near the AIS operating channels (for
example channels 27, 28, 86).
The antenna should be placed in an elevated position that is as unobstructed as possible, with a
minimum of 2 m in the horizontal direction from any structures made of conductive materials. The
antenna should not be installed close to any large vertical obstruction. The objective for the VHF antenna
is that it should "see" the horizon freely through 360°.
The VHF antenna should be installed safely away from interfering high-power energy sources such as
the radar scanner and other transmitting radio antennas, preferably at least 3 m away from and out of the
transmitting beam.
Ideally there should not be more than one antenna on the same level. The AIS VHF antenna should be
mounted directly above or below the ship’s primary VHF radiotelephone antenna, with no horizontal sepa-
ration and with a minimum of 2 m vertical separation. If it is located on the same level as other antennas,
the distance apart should be at least 10 m.
For further information, see Figure 10-5 on page 104.
AIS VHF
Antenna
AIS VHF
Antenna
360° view 360° view
>2 m
>2 m
Mast, boom, railing
with small diameter
(should be avoided)
Mast, boom, railing
with small diameter
(should be avoided)
Side view Side view Top view Top view
Conductive superstructures Conductive superstructures
Superstructures,
e.g. deck house,
funnel,
Superstructures,
e.g. deck house,
funnel,
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