Sonardyne Dunker 6

Dunker 6 is a 6G® Wideband®2 Long BaseLine (LBL) and telemetry transceiver specifically designed for vessel deployment. The super duplex stainless steel housing with shock and vibration isolated electronics makes for an extremely rugged dunking system



Its high power output and Sonardyne Wideband®2 signal processing offers improved operating range and acoustic performance in challenging conditions such as when deployed from noisy vessels or in multipath environments.

The internal Lithium-ion rechargeable battery pack minimises the supply current for long dunker cables. It also enables relocation of the dunker if the cable is cut.

The robust AGP connector on the Dunker 6 is identical to the ROVNav 6 and HPT USBL for compatibility and to reduce spares.

Dunker 6 LBL and telemetry transceiver is fully compatible with Sonardyne’s modem and logging equipment such as AMT and Fetch products, allowing it to be used to retrieve data or configure logging regimes. It supports all of Sonardyne Wideband®2 spread spectrum acoustic communication.

The Dunker 6 system consists of 100 m of cable on a stainless steel cable drum with brake and locking mechanism. The 10 m deck cable between the 48 V Surface Interface Unit (SIU) and the cable drum allows the drum to be conveniently located. The connection to the cable drum is via an easily replaceable 8-way SubConn.


  • Perfect for commanding LBL transponders
  • Use it to recover data from Fetch and AMTs
  • Deploy it over-the-side of your vessel
  • Rugged mechanics and connectors
  • Shock mounted internal electronic


Technical information

Feature Type 8309-1351 Type 8309-1353 Type 8309-1355 Type 8309-1356
Depth Rating 1,000 m 1,000 m 1,000 m 1,000 m
Operating Frequency MF (21–32.5 kHz) MF (21–32.5 kHz) LMF (14–19 kHz) LMF (14–19 kHz)
Transducer Beam Shape Omni-directional Directional Omni-directional Directional
Transmit Source Level (dB re 1 µPa @ 1 m) 187–196 dB (4 Levels) 190–202 dB (4 Levels) 187–196 dB (4 Levels) 187–202 dB (4 Levels)
Tone Equivalent Energy (TEE)* 193–202 dB 196–208 dB 193–202 dB 193–208 dB
Receiver Sensitivity (dB re 1 µPa) 90–120 dB (7 Levels) 80–120 dB (7 Levels) 90–120 dB (7 Levels) 80–120 dB (7 Levels)
Range Precision Better than 15 mm
Serial Communications
(Software Programmable)
Primary port: RS485 (half duplex) or RS232
Secondary port: RS485 (half duplex) or RS232 or SYNC IN
Operating Voltage 24 or 48 V dc (±10%)
External Power:
Active (listening)
Peak (during transmission)
<3 W typical (maximum 6 W when charging)
<80 W
Battery Life Li-ion (Listening) 3 Days
Mechanical Construction Super-Duplex Stainless Steel
Dimensions; Length x Diameter 692 x 200 mm 660 x 200 mm 586 x 200 mm 641 x 230 mm
Weight in Air/Water** 24/16 kg 26/17 kg 20/14 kg 28/17 kg
Connector Type AGP (8-way female)



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