Table of Contents
Advertisement
Installation
Please note the following guidelines when selecting and locating the AIS VHF antenna:
● The VHF antenna should be located as high as possible and positioned as far from other antennas as
possible.
● The VHF antenna should have omnidirectional vertical polarization.
● Where possible the VHF antenna should be installed at least 3m (10ft) away from other transmitting
radio, satellite and RADAR antennas.
● Ideally the AIS VHF antenna should be mounted directly above or below the ship's primary VHF
radiotelephone antenna, with no horizontal separation and with a minimum of 2m vertical separation.
If it is located on the same horizontal level as other antennas, the distance apart should be at least
10m. Refer to Figure 41 for further guidance.
● The VHF antenna cable should be kept as short as possible to minimise signal loss. High quality, low
loss coaxial cable appropriate to the installation location should be used.
● The VHF antenna cable should be terminated in a PL-259 co-axial connector for connection to the
AIS transceiver.
● Any outdoor installed connectors in the antenna cables should be waterproof by design.
● Antenna cables should be installed in separate signal cable channels at least 10cm (4ins) away from
power supply cables. Crossing of cables should be done at right angles and sharp bends in the
antenna cables should be avoided.
● Connect the VHF antenna cable to the VHF connector on the AIS transceiver as shown in Figure 42.
Figure 41 VHF antenna installation
Page 38
VHF antenna
Positioned at least 3m (10ft)
from other transitting radio,
satellite and RADAR antennas
Advertisement
Table of Contents
