B953: AIS Class B SOTDMA 5W transponder Splitter USB-NMEA0183-N2K

The AIS Class B SOTDMA transponder 5W, such as the B953, uses SOTDMA (Self-Organising Time Division Multiple Access) technology with a transmit power of 5W (37dBm ± 1.5 dB).

This technology offers several advantages over 2W Class B CSTDMA (Carrier Sense Time Division Multiple Access) transponders:

Transmission priority: SOTDMA guarantees priority access to AIS channels, ensuring your boat’s messages are transmitted even in high-traffic areas.Extended range: The 5W transmit power provides greater detection range.More frequent updates: Your boat’s position is updated more regularly, providing other vessels with a more accurate picture.

The EM-Trak B953 transponder is designed to integrate easily with various navigation systems thanks to its multiple interfaces:

NMEA 2000: It has an NMEA 2000 port (LEN=1) for direct connection to an NMEA 2000 network.
NMEA 0183: It features two NMEA 0183 ports:
A high-speed port (38,400 baud) for connection to your chartplotter.
A low-speed port (4,800 baud) for connection to other NMEA 0183-compatible sensors, allowing data multiplexing to the chartplotter.
USB: A USB port is also available for connection to a PC, particularly for configuration via the proAIS2 software.
All converted NMEA PGNs are multiplexed to all NMEA 0183 output ports and USB ports.

The EM-Trak B953 transponder requires a direct current (DC) power supply:

Input voltage: DC 12–24 V (operating range 9.6 V to 31.2 V max).Average power consumption: ~245 mA / 2.95 W at 12 V.Peak current: Up to 2.5 A.It is recommended to use crimped and soldered terminals for connection to the power source, with a suitable 3 A circuit breaker and/or fuse block.Undersized or excessively long power cables may degrade performance or cause the unit to restart.

No, the EM-Trak B953 transponder includes a VHF antenna splitter. This means it can share your existing VHF antenna with your VHF radio, eliminating the need to install a separate VHF antenna specifically for AIS. This simplifies installation and reduces clutter on your sailboat.

The EM-Trak B953 transponder features the following physical and environmental characteristics:

Dimensions: 149 mm (Length) x 118 mm (Width) x 47 mm (Height). Weight: 345 grams (variant with antenna splitter). Environmental resistance: Water- and weather-resistant with IPx6 and IPx7 certifications, making it suitable for demanding marine environments. Operating temperature: From -25°C to +55°C.