• Freshwater
  • Marine

WHS 4350

  • Product Type Icon Hydrophone

Wireless Hydrophone System JSATS Acoustic Autonomous Receiver/Datalogger

Lotek JSATS compatible wireless hydrophone system WHS 4350 is an autonomous, submersible receiver/datalogger that detects, decodes and records the presence of JSATS transmitters. WHS 4350 is an affordable, compact, and lightweight system that enables researchers to utilize the smallest acoustic tags available. Digital BPSK binary phase shift keying coding algorithm permits over 65,000 unique ID codes on a single frequency (416.7 kHz) and sub-millisecond ID burst is robust against code collision in multi-tag congregations and multipath reverberant environments.


  • Increased Sensitivity Omni-Directional Spherical Piezo or Cylindrical Piezo compatible
  • 2 or 4 Lithium D-Cell Battery variants
  • Sensor options include: Pressure, Temperature, and Tilt
  • Product Features

    • Autonomous underwater node – complete with hydrophone, receiver, datalogger in waterproof/submersible (400 m) package powered by one to four D-cell lithium batteries
    • JSATS (Juvenile Salmon Acoustic Telemetry System) Compatible – allows researchers to utilize the smallest acoustic transmitters available – ¼ gram
    • Sub-millisecond ID pulse – robust against code collision in multi-tag congregations and multi-path environments
    • Over 65,000 unique ID codes on a single frequency
    • Energy efficient – ability to operate for 50 days with a single D-cell lithium battery and up to 200 days with 4 cells
    • Low cost and light weight – minimizes deployment resources required
    • Supplied with Host software for easy programming, data download, and data processing
    • Positioning (2D) – compatible with Lotek UMAP Positioning System software
    • Integrated transmit “beacon” – provides ongoing assurance of system functionality and means for receiver location and recovery.
    • Depth rated to 400 meters
    • Bluetooth®-enabled for wireless programming and system diagnostics
    • Real time monitoring option for mobile tracking with optional cable
    • Sensor Options include the ability to log Pressure, Temperature and Tilt
  • Product Applications

    Salmon smolt survival studies, fish passage/guidance efficiency studies, habitat utilization and species interaction studies, migration timing and behavior, fine scale 2D positioning with Lotek UMAP positioning software. A cost effective solution in both flat and fast moving water.

    JSATS system deployed off the coast of Spain

    Using data generated with UMAP, then processed and filtered in R, this animation shows the activity of marine animals; pearly razor fish, n = 320, Common pandora, n = 6, Sand Steenbras, n =  1, Sea bream and Rough Ray, n = 3.”

    Credit: Josep Alos, Eneko Aspillaga, IMEDEA, 2020.




  • Product Specifications

    Model WHS 4350S WHS 4350L
    Weight in air (kg) 1.2 1.7
    Life (days) 100 [1] 200 [2]
    Size (ØxL) (mm) 60 x 435 60 x 585
    Buoyancy Slightly Negative (< 100g)
    Depth rating (m) 400
    Data storage / capacity 8 GB removable microSD card

    1. Operational life based on 2 lithium primary D-cells. Operational life may vary slightly based on beacon schedule and ambient temperature.
    2. Operational life based on 4 lithium primary D-cells. Operational life may vary slightly based on beacon schedule and ambient temperature.


    Technical specifications:
    Operating temperature range: 0°C to 50°C
    Operating frequency: 416.7 KHz
    Decoding: BPSK compatible with JSATS AMT 31-bit (7-bit Barker; 16-bit ID; 8-bit CRC)
    Data File Format Header, time, date, tag ID, relative signal strength, diagnostic information
    Diagnostic Information Memory status, battery voltage, total no.
    detections, no. detections in last hr.

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