WHS 4250

• 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

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.

Getting ready for our reality mining experiment with @enekoasp in Mallorca with @RArlinghausFish @LeibnizIGB to track a full coastal food-web (350 individuals: invertebrates to big rays) at unprecedented spatial(m.)/temporal(s.) resolution with @LotekWireless positioning system pic.twitter.com/H7g2AxNfUO

— Josep Alos (@josep_alos) March 21, 2019

After 6 months, we have retrieved half of our telemetry @lotek array (+35 moorings anchors 30 kg each😂). No problems so far besides de hard work!💪300 fish HD positioning!🐟🐡The supercomputing center can not wait to touch to the data!😊@fishecology_ & @RArlinghausFish pic.twitter.com/quCuoTsK9E

— Josep Alos (@josep_alos) September 30, 2019

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.

Here you’ll find product resources including software applications, manuals, quick-start guides and spec sheets. For any questions, please contact us.