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The VR2Tx Acoustic Receiver combines a VR2W receiver with a built in V16-like transmitter that allows communications with receivers while still deployed. The VR2Tx maintains all of the existing features of the VR2W plus much more.
- 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 VR2Tx 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 VR2Tx units
Surface to Receiver Communications Using the VR100 Receiver
The VR2Tx 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 VR2Tx.
VEMCO Bluetooth Communication Kit
A VEMCO Bluetooth Communication Kit is required to enable your receivers to communicate with your PC.
For more information, please download the VR2Tx Datasheet.
|Dimensions||308 mm long x 73 mm diameter|
|Weight||1190 g in air, 50 g in water|
|Power supply||1 – 3.6 V Lithium D cell battery|
|Battery life||Approximately 14 months|
|Maximum depth||500 metres|
|Receive frequency||69 kHz standard|
|Storage||Approximately 1.6-million detections (16 MBytes non-volatile flash memory)|
|Communication||Acoustic via VR100 and Bluetooth®|
|Attachment||Standard: cable ties|
|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|
Field Communication Quick Guide
VR2Tx Quick Guide
VR2Tx User Manual
VUE Software Version 2.3.0 (Posted September 2016)
VR2AR & VR2Tx Receiver Noise Measurements
VR2Tx Firmware Version 1.2.3 (Posted April 2016)
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-VR2Tx range test could yield a range of 300-400 m and a V16-VR2Tx 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. The VR2Tx has a V16-like transmitter built-in which has all the power output setting options as the V16.
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.).
No, our receivers and coded transmitters are not compatible with other vendor’s equipment. Our receivers and transmitters are designed to work as a system using the VEMCO proprietary coding system. Some manufacturers make claims of compatibility but these are false. Over time, we change code maps and tag and receiver firmware and hardware to enhance both functionality and coding options to allow you to conduct research and data analysis with confidence. We cannot provide support for data analysis (e.g., VPS, false detect analysis, biological analysis) for any data that might originate from competitor tags or receivers.
VR2Tx receivers are to be used with a Tadiran TL-5930/F Lithium Inorganic 3.6V battery or equivalent. These batteries will last approximately 14 months. Frequent communication via Bluetooth and your PC will consume more battery life than when the receiver is in RECORD mode.
You cannot rely on the battery voltage in VUE as an indicator of remaining life due to the discharge characteristics of this battery type. To ensure you are always using a battery with enough remaining life, we recommend tracking actual time the battery has been in use by writing deployment/retrieval dates directly on the battery. Inspect the battery case prior to deployment and do not use if there is any damage.
These batteries have a shelf life of approximately 5 years. Store these batteries at room temperature and always disconnect the battery in the VR2W if you plan on storing your receivers for any long periods (i.e. months at a time).
For information on how to change your receiver’s battery, please refer to Section 2 of the VR2W User Manual.
No, a 180 kHz version of the VR2Tx receiver is not yet available.
Generally, in most cases we recommend that a VR2Tx should be orientated with the hydrophone looking upwards. This is typically because receivers are commonly moored closer to the seafloor than the surface. In some situations it may be beneficial to mount the receiver with the hydrophone pointing towards the sea floor. If a receiver is mounted near the surface or a considerable distance from the sea floor and if the researcher is monitoring benthic creatures a bottom looking receiver may perform better because your tagged animals will not be in a shadow zone (under the receiver). If receiver orientation is a concern, we recommend that you perform range tests.
Note that the tilt angle of a deployed VR2Tx can be checked remotely using a VR100.
The VR2Tx has a recommended operating temperature range of -5 to 40oC. If there is a possibility that your receiver will exceed either of these temperatures, please consider another deployment location. Exposure to direct sunlight can cause the internal temperature of the black receiver case to reach temperatures much higher than the ambient temperature.
We would be very pleased to help connect with the owners of these unknown IDs. Our Customer Service section contains detailed information on our procedure for addressing the detection of foreign/unknown IDs.
If you are having trouble connecting to a receiver via Bluetooth first ensure that you are using the VUE Preview Beta Software Version of VUE Software for the VR2Tx and VR2AR and refer to the Bluetooth Troubleshooting Quick Guide.
Yes. VEMCO’s VR2Tx 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.
- VUE Software
- Application Notes
- User Guides
Tracking Shortnose and Atlantic Sturgeon
Species: Shortnose sturgeon, Atlantic sturgeon
Dr. Matt Litvak's lab has been tracking shortnose and Atlantic sturgeon using VEMCO gear since 1998. They have used VEMCO gear to find and describe one of the shortnose sturgeon overwintering sites; their spawning location; and juvenile and adult distribution in the Saint John River. In addition to shortnose sturgeon, they are also tracking Atlantic sturgeon adults during their migration to and from spawning in the Saint John River and juveniles within the Saint John River. Funds for this research have been provided through NSERC, OTN, MITACS, NB Wildlife Trust Fund and VEMCO (VR100 Student Offer Award).
Telemetry in the Florida Keys
Species: Black grouper, Nassau grouper, Gray snapper, Mutton snapper
Florida Fish and Wildlife research scientists are using telemetry to examine movement patterns and site fidelity of several snapper and grouper species throughout the Florida Keys.
- Monitor receiver status and health while units are still deployed
- Improve fine scale positioning results by using as a VPS sync tag
- Collect detection information to verify performance without retrieving units