SI-TEX MDA-5 Hi-Power 5W SOTDMA Class B AIS Transceiver w/Built-In Antenna Splitter & Long Range Wi-Fi

Description

Share Class B+ AIS data over a long-range Wi-Fi connection while using the boat’s existing VHF antenna with the SI-TEX MDA-5. Its 5W SOTDMA transmitter, built-in antenna splitter, 50-channel GPS receiver, and Wi-Fi capability give boaters a connected AIS solution for chartplotters, tablets, computers, and mobile navigation applications. Need higher-output AIS without adding a second antenna or hardwiring every display? The MDA-5 supports NMEA 2000, dual NMEA 0183 ports, USB, and protected 12V/24V installation.

Key Specifications

• SI-TEX MDA-5 high-power Class B SOTDMA AIS transceiver with antenna splitter and Wi-Fi.
• 5W Class B SOTDMA AIS transmit-and-receive capability.
• Dual-channel AIS operation across 156.025–162.025 MHz.
• Built-in zero-loss VHF antenna splitter for compatible shared VHF/AIS antenna arrangements.
• Integrated DSC watch receiver.
• Internal 50-channel GPS receiver.
• NMEA 2000, dual NMEA 0183, USB, and long-range Wi-Fi connectivity.
• Status LED indicators; no integrated chartplotter display.
• 12V/24V DC input with up to approximately 3.5W maximum power consumption.
• IPX2 protected enclosure for dry interior installation.
• Approximate dimensions: 5.5 × 3.9 × 1.7 inches; approximate weight: 0.93 lb (0.42 kg).

Integration

The MDA-5 requires a compatible VHF voice radio, suitable shared VHF antenna, correct MMSI/static vessel-data programming, and an MFD, chartplotter, computer, or mobile application to show AIS targets. It is not a VHF voice radio, radar, chartplotter, GPS display, EPIRB, or collision-avoidance guarantee.

Long-range Wi-Fi can provide more flexible mobile-device access, but its effective connection depends on vessel layout, antenna placement, interference, distance, device compatibility, and network security. AIS reception and transmission also depend on local VHF coverage and other vessels transmitting accurate data.

Installation Notes

Install the transceiver in a dry, accessible interior location. Connect the VHF radio, shared VHF antenna, and AIS ports as specified by SI-TEX, keep RF cables separated from high-current wiring, and place an external GPS antenna with clear sky view if needed. Configure NMEA, USB, and Wi-Fi connections for the intended displays.

Use a correctly fused 12V/24V power circuit and secure Wi-Fi with an appropriate password. Program accurate MMSI, vessel name, call sign, dimensions, and GPS antenna offsets before transmitting. Verify VHF operation, AIS reception/transmission, NMEA target data, and Wi-Fi connections after installation.

Before Ordering

Confirm Class B SOTDMA suitability, VHF radio and shared-antenna compatibility, MMSI registration, GPS antenna needs, NMEA/USB/Wi-Fi integration, 12V/24V power availability, and dry protected mounting space before ordering.