Em-Trak B923 2W Class B AIS Transceiver with Integrated VHF Splitter

The Em-Trak B923 is a compact and lightweight Class B AIS transceiver designed to provide superior AIS receive and transmit performance. With a standard transmit power of 2W (CSTDMA), it allows you to see more AIS information and targets at maximum range while maintaining ultra-low power consumption.

This model includes an integrated high-performance VHF antenna splitter, enabling it to share your existing VHF radio antenna without any compromise in performance and ensuring fail-safe reliability. Featuring built-in intelligent connectivity, a next-generation GPS receiver and antenna, and the unique FLEXI-FIT™ bracket system, the B923 ensures a safe and straightforward installation process.

Key Features

• Certified AIS Class B – 2W CSTDMA
• Integrated VHF antenna splitter for seamless VHF radio sharing
• Global certification – USCG, FCC, Canada, Europe
• Powered by the SRT-AIS™ Transceiver Engine for unparalleled performance
• FLEXI-FIT™ bracket system for easy and secure installation
• Internal high-performance GPS receiver and antenna (external antenna optional)
• IPx6 and IPx7 certified for water, pressure spray, and damp proof protection
• Designed to withstand vibration, shock, and extreme temperatures
• Small, lightweight design with ultra-low power consumption
• Ensures connectivity and interoperability with any chart plotter or PC
• Compatible with NMEA 0183 & NMEA 2000
• Automated health and performance monitoring
• Silent mode (transmit-off) function
• Enhanced RF screening to protect against electromagnetic interference
• Includes built-in power surge protection
• Fail-safe VHF radio operation

Physical & Environmental Specifications

Size: 150 x 115 x 45mm

Weight: 415g

Operating Temperature: -25°C to +55°C

Storage Temperature: -25°C to +70°C

Ingress Protection: IPx6 and IPx7

Electrical Specifications

Supply Voltage: 12V or 24V DC

Supply Voltage Range: 9.6V - 31.2V DC

Average Current (at 12V): 245mA

Peak Current: 2A

Average Power Consumption (at 12V): 2.9W

Galvanic Isolation: NMEA 0183 inputs only, NMEA 2000, VHF antenna port

Connectors

• VHF Antenna: SO-239
• VHF Radio: SO-239
• GNSS: TNC
• Power/NMEA 0183/Silent Mode: 12 way circular multipole
• NMEA 2000: 5 way Micro-C connector
• USB: USB Micro-B

Data Interfaces

NMEA 0183: 2 x bi-directional ports

NMEA 2000: NMEA 2000 Ed 3.101, LEN=1

USB: PC virtual com port for NMEA 0183 data

Standards Compliance

AIS Standards: IEC 62287-1 Ed. 3 ITU-R M.1371.5

Product Safety Standards: EN60950-1 2006 +A11:2009 +A1:2010 +A12:2011 +A2:2013 EN62311:2008

Environmental Standards: IEC 60945 Ed. 4

Serial Data Interface Standards: IEC 61162-1 Ed 5.0 IEC 61162-2 Ed 1.0

NMEA 2000: NMEA 2000 Ed 3.101

GNSS Performance Standards: IEC 61108-1 Ed 2.0 IEC 61108-02 Ed 1.0

GNSS

Systems Supported: GPS, GLONASS, BeiDou, Galileo (two of any combination, three including GPS, Galileo)

Channels: 72

Internal/External Antenna: Internal or optional external antenna

Time to First Fix from Cold Start: 26s

VHF Transceiver

VDL Access Scheme: CSTDMA

Operating Frequency: 156.025MHz - 162.025MHz

Channel Bandwidth: 25kHz

Receivers/Transmitters: 2 x receivers, 1 x transmitter

AIS Receiver Sensitivity (20% PER): -111dBm

AIS Transmitter Power: 2W (+33dBm)

User Interface

Indicators: Power, transmit timeout, error, silent mode