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CSB200 Class B AIS
R2.0 9
Connect a suitable GPS antenna to the TNC connector (inner of
the two) at the rear of the CSB200
Connect a suitable VHF antenna to the BNC connector (outer of
the two) at the rear of the CSB200
GPS Antenna
The GPS antenna used must be of the active type (i.e. it should
incorporate an LNA) and must be suitable for marine shipboard
applications (index of protection, ruggedness, means of mounting, etc.).
An antenna should be selected with a gain (in dB) depending on the
length of cable between the antenna and the AIS unit; after subtraction of
cable and connector losses, a minimum total gain of 25 dB should be
available at the CSB200 unit GPS antenna connector.
The GPS antenna to be used for AIS use must be a dedicated antenna,
i.e. not shared with any other GPS receiver.
Installation of the GPS antenna is critical for the performance of the built
in GPS receiver which is used for timing of the transmitted time slots and
for the supply of navigational information should the main navigational
GPS fail. We strongly recommend that:
1. The GPS antenna is mounted in an elevated position and free of
shadow effect from the ship’s superstructure
2. The GPS antenna has a free view through 360 degrees with a
vertical angle of 5 to 90 degrees above the horizon.
3. As the received GPS signal is very sensitive to noise and
interference generated by other onboard transmitters, ensure that
the GNSS antenna is placed as far away as possible from radar,
Inmarsat and Iridium transmitters and ensure the GPS antenna is
free from direct view of the radar and the Inmarsat beam.
4. It is also important that the MF/HF and other VHF transmitter
antennas are kept as far away as possible from the GNSS
antenna. It is good practice never to install a GNSS antenna within
a radius of 5 meters from these antennas.
VHF antenna
The VHF antenna employed for AIS use:
Must be a dedicated antenna, i.e. not shared with any other VHF
transmitter/receiver.
CSB200 Class B AIS
R2.0 10
Must be suitable for marine shipboard applications (index of
protection, ruggedness, means of mounting, etc.)
Should be omni-directional and vertically polarised with unity
gain (0 dB) with a bandwidth sufficient to maintain
VSWR <1.5
over the frequency range 156 – 163 MHz. As a minimum the
3dB bandwidth must cover the two AIS channels and the DSC
Channel.
Should be mounted with at least a two metre vertical separation
distance from any other VHF antenna used for speech or DSC
communication.
VHF Antenna Connection
Connecting a badly mismatched VHF antenna, leaving the VHF antenna
port disconnected, or shorting the VHF antenna port will activate the
VSWR alarm, cause the unit to stop sending position reports or cause
damage to the transponder.
Radio Frequency Exposure
To meet the requirements for Radio Frequency Exposure it is necessary
to install the VHF antenna correctly and operate the AIS equipment
according to the instructions.
The VHF antenna must be mounted at a minimum distance (vertical
separation) of 3 metres from the head of any person standing on deck in
order to meet international safety directives on Maximum Permissible
Exposure (MPE) / Specific Absorption Rate (SAR).
Where no suitable structure exists to achieve a 3 metre vertical
separation then the antenna base must be mounted at least 1 metre
above the head of any person within range, all persons should stay
outside the 3-metre safety radius and if practical a grounded RF shield
should be interposed between people and the antenna.
Failure to adhere to these limits could expose persons within the 3 metre
radius to RF radiation in excess of the MPE / SAR limits.
www.Busse-Yachtshop.de email: info@busse-yachtshop.de
5


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