Lotek JSATS acoustic compatible wireless hydrophone system WHS 4250 is an autonomous, submersible receiver/datalogger that detects, decodes and records the presence of JSATS transmitters. WHS 4250 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.
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
|Model||WHS 4250D||WHS 4250L|
|Weight in air (kg)||1.2||1.7|
|Life (days)||100 ||200 |
|Size (ØxL) (mm)||60 x 435||60 x 585|
|Buoyancy||Slightly Negative (< 100g)|
|Depth rating (m)||400|
|Data storage / capacity||2 GB removable SD 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.
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.