WHS 1000 - Wireless Hydrophone Systems

Lotek Wireless Hydrophone Systems (WHS) represent a unique, hybrid technology that brings the flexibility of radio telemetry to acoustic applications. WHS systems are capable of detecting underwater acoustic signals and relaying those signals through the air, in real time via VHF transmission, to a radio telemetry receiver.

Real-Time Monitoring
Monitor real-time activity in acoustic environments - by air as well as by boat - thereby simplifying set up and minimizing the risk of missed data.

Eliminate Hard-wire Cable Connections
Wireless Hydrophone Systems eliminate the need for underwater/direct cable connections and with it the costs and effort typically associated with installing and maintaining long cable runs.

Ease of Deployment
Wireless Hydrophone Systems are secured by anchor. This deployment method significantly reduces deployment time over conventional acoustic hydrophone or bottom-moored datalogging systems.

Range Performance
Sensitivity of Wireless Hydrophone Systems in combination with the SRX_400 receiver, result in a telemetry system that maximizes overall range performance. Radio reception range can be several kilometers for systems using land-based receiver in line of site with WHS.

Automatic and Manual Gain Control
Manual Gain Control allows on-site system calibration based on coverage requirements. Adaptive Gain Control dynamically reduces gain in the presence of variable noise sources e.g., boat traffic, rough seas, resulting in better signal discrimination and maximized signal detection.

Field Replaceable Battery Pack
The field replaceable alkaline battery pack provides a simple, dependable and low-cost power source to ensure downtime is minimized.

Battery Power Status Indicator
Battery power level is routinely monitored by the WHS and its corresponding status is transmitted every hour. This eliminates the guesswork as to when batteries need changing and assures the user that the system is functioning.

Length:	19.7 in. (50.0 cm)
Diameter:	5.0 in. (12.7 cm)
Weight:	13 lbs. (5.9 kg) (incl. battery pack)
Depth rating:	328 ft. (100 m)
Battery Life:	4 - 6 mo. (WHS_1100, 1200)
Hydrophone Frequency:	65.5 - 76.8
Radio Frequency:	140.000 - 175.000 MHz (factory set)
Min. Detectable Signal:	90 dB re 1 µPa@76.8 kHz

The temporal resolution of the WHS can be enhanced. Ask our application engineers for details.

Periodic design modifications may alter specifications.
It is recommended that specifications be confirmed when placing an order.

(click on image to see enlarged)

As an integral component within your telemetry system, the SRX 400 receiver complements your Wireless Hydrophone System with respect to both performance and applications potential. Possibilities include use with:

• Coded transmitters
  Up to 210 uniquely identifiable codes can be assigned on a single frequency to significantly reduce scan cycle time.
  
  
• CART tags
  Combined acoustic radio transmitters optimize signal mode for water conditions based upon user specified time, depth, or conductivity set point.
  
  
• Remote control
  Download data and upload receiver settings via land line, cellular, radio modem or MSAT link.

WHS_1100  Single acoustic channel retransmission via VHF
Valid signals detected on a single acoustic channel are relayed in the VHF band. Permits precise temporal resolution typically required for studies that examine movement patterns of large numbers of solitary animals.

WHS_1200   Dual acoustic channel retransmission via VHF
Valid signals detected on two acoustic channels are multiplexed and relayed in the VHF band. Dual channel capability benefits applications that involve larger numbers of tagged animals and studies in which animals congregate in the same study area(s).

Full WHS_1000 product sheet (PDF).