VHTx-69k Transponding Hydrophone
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The VHTx-69k is an omni-directional transponding hydrophone that attaches to the VR100 active tracking receiver to communicate with VEMCO’s two newest receivers, the VR2Tx Transceiver and the VR2AR Acoustic Release and Transceiver.
The VHTx-69k maintains all of the features of the VH165 hydrophone and is used with the VR100 receiver to locate and track VEMCO acoustic transmitters on passing fish or equipment. The VHTx-69k operates within the 50 kHz to 85 kHz frequency range. The hydrophone is protected by a cage and is weighted to aid in lowering the hydrophone into water.
For more information, download the VHTx-69k datasheet.
- The VHTx is weighted and, depending on the current in the area, should not need additional weight to keep it at depth. If additional weight is required, be sure to use a separate rope to hold the weight and use strain-relief techniques to keep the hydrophone cable from being strained.
- Turn off boat motor and depth sounder to reduce acoustic interference.
|Frequency range||50kHz – 85kHz|
|Tag compatibility||V7, V8, V9, V13, V16, VMT|
|Operational temperature range||-5°C to +40°C (water must not freeze)|
|Case (dimensions and material)||41.275 mm diameter x 210 mm; Black acetal with a 304 stainless steel cage|
|Weight in air||2434 g (including cable)|
|Cable type and available lengths||Shielded twisted, polyurethane jacket cable with a minimum bend radius of 4 inches; Length 25 metres standard|
|Uses||Omni-directional hydrophone detects pings from any direction and transmits in all directions. Use with VR100-200 for acoustic communication with transponding receivers (VR2Tx and VR2AR).|
|Maximum tow speed||Not recommended|
|Preamplifier gain||50 dB nominal|
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).