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JSATS AMT - Juvenile Salmon Acoustic Telemetry System Acoustic Micro Transmitter

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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.

This acoustic 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.

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
Juvenile Salmon Acoustic Telemetry System Acoustic Micro-Transmitter
TAG MODEL Physical Specifications Calculated Life (Days)*
(with given transmission period seconds)
  Size (l x w x t) (mm) Dry Weight (g) 2s 5s 10s 20s
L- AMT-1.416 10.7 x 5.4 x 3.1 0.28 10 25 48 87
L- AMT-1.421 11.1 x 5.5 x 3.7 0.32 15 38 72 131
L-AMT-5.1B 5 x 7 x 13 0.6 39 95 180 327
L-AMT-5.2 7 x 7 x 16 1.1 81 189 341 568
L-AMT-8.2 9 x 23 3.5 218 508 914 1522
L-AMT-14-12 14 x 45 8.0 429 1009 1837 3114
L-AMT-16-25 16 x 57 18 2508 5951 10973 18980

* Calculated life represents expected or average life.
Warranty Life is 80% of calculated life.
Maximum warranty life is three (3) years
Minimum signal strength is +156 dB (re 1 uP @ 1 meter)
Transmitters that do not meet the warranty life during normal use will be replaced.

Product specifications provided herein are subject to change as a result of ongoing product development. Please contact your Lotek sales representative for current specifications.

Product specifications tolerance +/- 5%.

Surface Roughness: Smooth and devoid of sharp edges or protrusions
Coating: Parylene-C (25 microns min. thickness) or alternate field proven encapsulation
Biocompatibility: Biologically inert coating
Shape: See photograph in "Overview" tab
Transmitter frequency: 416.7 kHz ± 0.05%
Transmitter power: Source level of +158dB (re:uPa @ 1 meter)
Pulse Repitition Interval (PRI): Factory configurable - 1 second minimum / 1 second increments
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
On/off switch: Non-contact acoustic trigger device, i.e. no exposed wires; tags are fully encapsulated when delivered.
Transmitter label: Discernable 4-character code representing the 16-bit tag ID code (0xFFFF)

Prior to delivery, 100% of all transmitters are tested for adherence to dimensional and dry weight specifications, acoustic source level, code sequence and transmit interval.

Shipment of AMT:
Transmitters are separated in the shipping box using shock absorbing high density anti-static foam.

JSATS-AMT acoustic tags (PDF).