VR2AR : Acoustic Release Receiver

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  • Overview
  • Gallery
  • FAQ
  • Specifications
  • Downloads
  • Overview

    The VR2AR Acoustic Release and Receiver combines a VR2Tx Receiver and an acoustic release along with a V16-like transmitter which allows researchers to remotely retrieve deployed receivers and communicate to the surface without retrieving the unit.

    The VR2AR maintains all of the existing features of the VR2Tx plus much more.

    • Quick and reliable acoustic release enables remote release of deployed units typically within one minute
    • Improve VPS (fine scale positioning) results using the built in transmitter as a VPS sync tag
    • Retrieve receiver status on demand from the surface via communications with a VR100 tracking receiver (models -200 and greater) and transponding hydrophone (VR100 and hydrophone sold separately)
      • monitor health, tilt angle, range, temperature, battery life and memory of deployed VR2AR units
      • monitor number of total detections as well as specific tag IDs with the programmable watch table
      • determine which receivers are in range of the VR100 (unit discovery mode)
      • locate potentially lost VR2AR units


    Optional Flotation Collar Available
    The VR2AR Flotation Collar is designed for use with the VR2AR Acoustic Release and Receiver and is easy to assemble and attach using two ¾-inch wrenches (not included).. The collar is a simple and easy deployment solution.

    Surface to Receiver Communications Using the VR100 Receiver
    The VR2AR communicates to the surface using the VR100 active tracking receiver with a transponding hydrophone and is compatible with all VR100 models sold since January 2013. Customers will require a new transponding hydrophone to attach to the VR100 to communicate with the VR2AR.

    To see an overview of how the VR2AR works, check out our VR2AR Demonstration Video.

    For more details, see Downloads section.

    Have you looked whether you need to update your VR2s? click here

  • Gallery
  • Frequently Asked Questions

    How much detection range can I expect?

    Detection range depends on so many factors that it is difficult to estimate without knowledge of the environment and prior experience with telemetry. Range depends on transmission power, signal absorption, line of sight, reflection/refraction, multipath and environmental noise (man-made & natural), and the receiving quality of the receiver/hydrophone. Typically areas that have clear water, sand or silt flat bottoms and low current exhibit the greatest ranges. Conversely, areas with turbid water, complex rocky bottom topography and high current exhibit low ranges. In all cases, extreme weather events and periods of high wind (waves) may significantly reduce range.

    In most cases greater transmission power output (dB) results in greater range. For example, in good conditions a V7-VR2AR range test could yield a range of 300-400 m and a V16-VR2AR test could yield ranges of 800-1200 m. There are some exceptions where high power and a reflective and low noise environment may cause detection breakdowns.

    Please try our Range Calculator but only use the results as a guide. One should always perform range testing to determine appropriate receiver spacing. For the enthusiast who wants to learn more about sound propagation, try the widely accepted reference on underwater sound by Urick (1983). (Urick, Robert J. Principles of Underwater Sound, 3rd Edition. New York. McGraw-Hill, 1983.).

    How long will my VR2AR battery last?

    The VR2AR transceiver will typically last 14 months on a single D-cell Tadiran lithium battery (model TL-5930/F). An estimation of the remaining battery life is available when acoustically communicating with the VR2AR through the VR100-200. TIP: Write the installation date on the battery so you know how long the battery has been in use.

    The AA Lithium battery only powers the release motor and should never need to be removed or disconnected from the VR2AR. It will last 100+ releases under load. The remaining battery life can be monitored using the VR100.

    Does transceiver orientation matter?

    The VR2AR must be orientated with the hydrophone looking upwards for communication with the VR100-200. Also, transceivers are commonly moored closer to the seafloor than the surface to minimize the effect of surface noise and conditions.

    How do I deploy my VR2AR transceivers?

    Tips on how to deploy your VR2AR transceiver can be found in the VR2AR Deployment Tips Guide and in Section 4 of the VR2AR User Manual (within this download section).

    Can my VR2AR measure noise in a specific location?

    Yes. VEMCO’s VR2AR receiver has the ability to record average noise levels as well as min/max noise levels for a specified time period.  If noise logging reveals that a deployment location may be unsuitable, then a comparison of noise levels at other deployment locations can be performed, and the least noisy location can be chosen. Also, the VR100-200 surface unit with a VHTx (Transponding Hydrophone) can be used to request and display noise measurements without having to retrieve your receiver. For more information,  see the VR2AR & VR2Tx Receiver Noise Measurement Guide.

  • Specifications
    Dimensions Length: 397 mm, 342 mm without release lug
    Diameter: 81 mm
    Mooring bracket width: 170 mm
    Weight 2350 g in air, 500 g in water
    Power supply 1 – 3.6 V Lithium D cell battery (Rx)
    1 – 4V Lithium AA cell battery (AR)
    Unit battery life Approximately 14 months
    Release battery life > 100 releases per battery
    Maximum depth 500 metres
    Receive frequency 69 kHz standard
    Storage Approximately 3-million detections (32 MBytes non-volatile flash memory)
    Communication Acoustic via VR100 and Bluetooth®
    Attachment Receivers purchased after October 2014: 2 x 14 mm mooring holes; 1 x 19.3 mm for release lug

    Receivers purchased prior to October 2014: 3 – 14 mm mooring holes (2 in mooring bracket, 1 in release lug)

    Firmware Field upgradable receiver firmware
    Software VEMCO user Environment (VUE) software
    Transmitters Logs and decodes ALL VEMCO 69 kHz transmitters
    Code maps Support for all current and planned VEMCO code maps
    Max test load 1000 lbs
    Max safe working load 250 lbs
    Max release load 250 lbs
  • Downloads

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