Survey Equipment

Sonardyne 7986: Lightweight Release Transponder

Availability: Ex-Rental Sale, Rental

The Sonardyne 7986 Lightweight Release Transponder (LRT) has been developed from the type of transponders used in Sonardyne TZ/OBC positioning system. Unlike similar release transponders, it has both receive and transmit functions, enabling accurate slant ranges to be measured, release actuation to be confirmed and its position to be determined.


Safe Working Load of 125kg

Depth rated to 500 metres, has a rugged, compact design

Up to 51 months deployment with long-life lithium battery pack

Hundreds of secure identities; field programmable with deck unit

Reliable, ‘screw-off’ release

Compatible with Scout USBL, ROVHomer, Homer-Pro and Prospector positioning/relocation systems


Depth rating 500 metres

Operating frequency: HF (35?50 kHz)

Transmit source level: 185 dB re 1?Pa @1m

Receive sensitivity: <110 dB re 1?Pa

Number of unique addresses: 400 (Field programmable)


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