Comar Systems 001-1019, Руководство пользователя

Страница: 28 / 32

CSB200-S
28
19 GENERAL WARNINGS
All marine Automatic Identification System (AIS) units utilise a satellite based system such as the
Global Positioning Satellite (GPS) network or the Global Navigation Satellite System (GLONASS)
network to determine position. The accuracy of these networks is variable and is affected by factors
such as the antenna positioning, how many satellites are used to determine a position and how long
satellite information has been received for.
It is desirable wherever possible therefore to verify both your vessel’s AIS derived position data and
other vessels AIS derived position data with visual or RADAR based observations.
19.1 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.
19.2 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.