Furuno, FA-70 CLASS B AIS TRANSPONDER

The Furuno FA-70 is a Class B+ AIS (Automatic Identification System) transponder designed for small commercial vessels, fishing boats, and yachts. It enables vessels to transmit and receive real-time navigation data, improving situational awareness and helping prevent collisions at sea.

Technical Specification

⚙️ GENERAL

Parameter	Specification
AIS Type	Class B+ AIS Transponder (Black box)
Operation Mode	SOTDMA / CSTDMA selectable
RX Capacity	2250 reports/min (single channel), 4500 (dual channel)
Initialization	Within 2 minutes after power ON
Operating Modes	Autonomous, Assigned, Interrogation response
Standards	IEC 62287, IEC 60945, ITU-R M.1371

📡 AIS / RF SPECIFICATIONS

Parameter	Specification
Frequency Range	156.025 – 162.025 MHz
Channel Spacing	25 kHz
Output Power	5 W / 1 W (SOTDMA), 2 W (CSTDMA)
Modulation	GMSK
Transmission Interval	5 sec to 3 min (depending on vessel speed)
Frequency Switching	Automatic

📥 AIS RECEIVER

Parameter	Specification
Receiver Type	Dual-channel AIS receiver
Receiving Method	Double super heterodyne
Sensitivity	≤ –107 dBm
Co-channel Rejection	≥ –10 dB
Adjacent Channel Selectivity	≥ 70 dB
Intermodulation	≥ 65 dB

🛰️ GPS RECEIVER

Parameter	Specification
Type	Built-in GNSS receiver
Accuracy	High accuracy with SBAS/DGPS support
Function	Provides position, SOG, COG for AIS transmission
Update	Fast update for real-time AIS reporting

🔌 INTERFACES & CONNECTIVITY

Parameter	Specification
NMEA Interface	NMEA 0183 & NMEA 2000
Ethernet	Via connected navigation systems
External Devices	Radar, chartplotter, ECDIS
Silent Mode	External ON/OFF switch
Antenna	Built-in VHF splitter (shared antenna)