AIS-CTRX Class B AIS Transponder Manual
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:
• 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
• The transponder was unable to transmit an AIS message due to the channel being already
occupied, e.g. by transmissions from other AIS transponders.
Error
This is a red LED which indicates, when lit, one of the following status conditions is possible:
• Transmitter lockout timer (1 second maximum) has operated
• GPS is unable to gain lock after 30 minutes
• VHF antenna VSWR is out of range
• Power Supply is out of range
• Background noise level is above the threshold level (-77dBm)
SRM Button (Silent mode)
The AIS-CTRX can be put in “silent” mode meaning that the transmitter will stop to transmit data on
the VHF channel and the AIS-CTRX will only receive data from other AIS units. This feature is enabled
by pushing the SRM button for 3 seconds. The yellow light will then go on to indicate that the
transmitter is off. To turn the transmissions on again press the SRM button again for 3 seconds and
the yellow light should go off to show that the AIS-CTRX is operating normally again.
Antennas
The AIS-CTRX unit requires VHF and GPS antennas independent from those in use for other
purposes. Please see Appendix A for details of the antenna required.
1.1E 24 LD2103
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