• Freshwater
  • Marine


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Juvenile Salmon Acoustic Telemetry System Acoustic Micro Transmitter

The Lotek JSATS AMT – Juvenile Salmon Acoustic Telemetry System Acoustic Micro Transmitter – was developed to satisfy the research and regulatory requirements for monitoring juvenile salmon in the Columbia River Basin.

The transmitter’s small size and relatively long operational life permits tracking of sub-yearlings throughout their natural environment while minimizing impact upon them.

The Lotek JSATS AMT acoustic tag is compatible with JSATS receiving systems and utilizes a Binary Phase-Shift Keying (BPSK) coding system that allows for tens of thousands of unique IDs on a single acoustic frequency. Each transmission consists of an ID and check sum delivered in less than one millisecond, thereby minimizing the probability of mis-identification or interference from code collision.


  • Coating: Parylene-C or alternate field proven encapsulation
  • Also available as JCART combined acoustic/radio transmitter
  • Product Features

    Key features:

    • Small size and light weight (0.28g) – suitable for small fish and sub-yearling applications
    • Over 65,000 unique Ids – embedded check sum reduces error rate
    • Sub-millisecond ID message length provides long life and reduced “code collision” rate
    • Used for autonomous monitoring presence/absence
    • Used for wireless positioning in 2D via Lotek UMAP positioning system
    • Now available as JCART combined acoustic/radio transmitter compatible with SRX 800 radio receivers and WHS 4250 acoustic receivers
  • Product Applications

    Juvenile fish survival studies through hydro-electric projects, juvenile fish behavior in the vicinity of guidance structures, fish behavior in reaction to anthropogenic disturbance.

  • Product Specifications

    Model Weight (g) Size (LxWxH)
    Expected life [1] (days)
    2s interval 5s interval 10s interval 20s interval
    L-AMT-1.416 0.28 10.7 x 5.4 x 3.1 10 25 48 87
    L-AMT-1.421 0.32 11.1 x 5.5 x 3.7 15 38 72 131
    L-AMT-1.527 0.47 12 x 6.5 x 3.7 27 66 126 229
    L-AMT-5.1 B 0.6 13 x 7 x 5 39 95 180 327
    L-AMT-5.2 1.1 16 x 7 x 7 81 189 341 568
    L-AMT-8.2 3.5 23 x 9 x 9 218 508 914 1522
    L-AMT-14-12 8.0 45 x 14 x 14 429 1009 1837 3114

    1. Calculated life represents expected or average life
    Stated specifications may vary by +/- 5%
    Prior to delivery, 100% of all transmitters are tested for adherence to dimensional and dry weight specifications.


    Technical specifications:
    Transmitter frequency: 416.7 kHz ± 0.05%
    Transmitter power: +158 dB (re: 1 uPa @ 1 meter)
    Pulse Repitition Interval (PRI): Factory configurable
    – 1 second minimum / 1 second increment
    Transmitter Label: Discernable 4-character code
    representing the 16-bit tag ID code (0xFFFF)
    ID Message encoding: 31-bits, BPSK, with format as follows:
    1. 7-bit Barker code (ox72)
    2. 16-bit tag ID code (0x0000 – 0xFFFF)
    3. 8-bit cyclic redundancy check (CRC), (oxFF)
    ID Message length: 744 microseconds
    Number of possible tag ID codes: 65,536

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