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User Manual
Lorenz AIS 3000 RT
Antenna connections
GPS Antenna
This is a TNC female bulkhead connector mounted under the unit top cover. This port provides the 5V DC feed for the active
GPS antenna required by the AIS 3000 RT unit.
VHF Antenna
This is a BNC female bulkhead connector mounted under the unit top cover.
Antenna types and mounting
Please see Appendix A for antenna details.
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User Manual
Lorenz AIS 3000 RT
x GPS failure
x VSWR exceeding the maximum allowed level
x The input voltage is out of the specified range
LED Indicators
Power
This is a green LED which indicates, when lit, that power has been connected correctly to the transponder, that the transponder
hardware has been configured, that the operating software is present, that the CPU has booted up, the application software is
running.
TX Timeout
This is a yellow LED which indicates when lit that the CSTDMA transmitter is prevented from transmitting. Reasons for this
include the following:
x The transponder’s internal GPS receiver is not operating or is not yet ready. [1] requires that a class B CSTMA
transponder shall not transmit if its internal position sensor is not operating
x The transponder was unable to transmit an AIS message due to the channel being already occupied, e.g. by
transmissions from other AIS transponders
x The transponder is in "Silent mode"
Error
This is a red LED which indicates, when lit, one of the following status conditions is possible:
x Transmitter lockout timer (1 second maximum) has operated
x GPS is unable to gain lock after 30 minutes
x VHF antenna VSWR is out of range
x Power supply is out of range
x Background noise level is above the threshold level (-77dBm)
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