VMT (VEMCO Mobile Transceiver)
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The VEMCO Mobile Transceiver (VMT) is a hybrid between a 69 kHz coded transmitter and a 69 kHz monitoring receiver (similar to the VR2W-69 kHz). It can be externally attached to an animal and is capable of detecting all VEMCO coded transmitters at 69 kHz. The VMT also behaves as a VEMCO coded transmitter and can be detected by other VEMCO receivers. The VMT can also detect other tagged fish in its presence.
- Externally attached to larger animals, the VMT is used to determine predator/prey interaction and inter-species association (i.e. the interaction between elephant seals and salmon, and grey seals and cod). It can also be used to study schooling behaviour in animals such as sharks and tuna.
- By attaching the VMT to a long ranging animal or a glider module, a mobile receiving station is created to extend detection ranges beyond the traditional fixed arrays – which are typically restricted to coastal locations.
- The VMT can operate at depths up to 1000m making it suitable for studies in deep water environments.
- Stationary objects such as FADs or buoys can be tagged with a VEMCO coded transmitter. The VMT can then collect data on the length of time an animal spends near the FAD or buoy.
The user has the ability to vary the receiver ontime (duty cycle) to suit the study objectives and extend the life of the tag – and the battery is factory replaceable.
The VMT data is stored in the tag memory and can be retrieved using the VMT Optical Reader. A high speed optical interface designed specifically for the VEMCO Mobile Transceiver, the Optical Reader has a USB interface for easy connection to desktop and laptop PCs. The reader is powered by the host computer and does not require batteries.
For more information, see the VMT Datasheet.
|Dimensions||35 mm diameter x 180 mm length|
280 g in air, 122 g in water
|Battery life||100% receiver duty cycle up to 10 months (battery life can be extended by changing the duty cycle; battery is factory replaceable|
|Maximum depth||1000 metres|
|Tx output power (similar to V16-6x)||156 dB re 1µPa @ 1 m (L mode); 161 dB re 1µPa @ 1 m (H mode)|
|User programmable options||Vary receiver ON time (duty cycle); some tag options|
It is important to always use the latest version of PC software to ensure that your data files are up to date and can be properly supported.
VMT Software Version 2.2.4 (Posted May 2016)
VMT User Manual
- VUE Software
- Application Notes
- User Guides
Advanced Telemetry and Bio-logging for Investigating Grey Seal Interactions with Marine Renewable Energy Installations
Species: Grey seals
Researcher William Kay is embarking on his PhD project using a combination of animal-borne data loggers and turbine-mounted acoustic receivers to investigate potential interactions between grey seals (halichoerus grypus) and tidal turbines; specifically any interactions between individuals from Ramsey (Pembrokeshire, Wales, UK) with the Tidal Energy Limited (TEL)'s DeltaStream deployed in the Ramsey Sound.
Transmitting species-interaction data from animal-borne transceivers
Species: Grey seal
Damian Lidgard and a team of researchers integrated a Bluetooth link into a VMT and GPS satellite-linked transmitter. The two-unit design allows data collected by the VMT to be transmitted via Bluetooth to the satellite transmitter, which relays the interaction data to the ARGOS satellite system for retrieval. To evaluate in-situ performance, units were deployed on two adult female grey seals on Sable Island, NS and recovered during the subsequent breeding season. Data archived by the VMT were compared with data uploaded via ARGOS.
- Determine predator/prey interaction and inter-species association
- Study schooling behaviour in animals such as sharks and tuna
- Extend detection ranges beyond the traditional fixed arrays
- Depth rating of up to 1000m