Specifications

8
4.2 Transponder Unit
Front view
Side view
The Transponder Unit contains all the core functionality of the AIS system and can function as a separate unit
connected to other display solutions confirming with the AIS message format. It consists of a splash proof
aluminum casing with the following connection possibilities:
VHF antenna and GPS
Antenna
External display connections (“Ecdis Port” and “Pilot/Aux Port”)
Sensor connections
DGNSS/DGPS
Beacon receiver connection
Alarm relay
Complies with the environmental requirements specified in IEC 60945 Ed.4 Exposed, and is certified for
IP56 /IPX6. The operating temperature is from -25°C to +55°C and storage temperature from -30°C to
+70°C
The receiving section of the Transponder consists of three VHF receiver circuits, for continuous
reception on both AIS channels (configurable from 154 MHz-164 MHz) and the DSC channel (ch70). The
transmitter circuitry is connected to the same antenna terminal and is switched internally.
Functionality for direct reporting with satellites (Long-range AIS broadcast) is implemented and
operates when so configured by the competent authorities.
The internal power supply of the Transponder is galvanically isolated in order to protect the internal circuitry
and operates in a wide voltage input range from 10.8 V–31.2 V. A backup power source can be connected if
available. Automatically switching to backup power source will take place if the main source of power is lost.