Technical Specification:

 Picture shows the OEM board connected to the "Neptune Sonar" model D/70/H hydrophone

Receive frequency 50kHZ standard Receive Frequency optional 45-70kHZ Power 12V at 150uA (yes micro-amps!) (no signal) Sensitivity 15uV - 0.6V p-p Receiver type Hard limited Detection Differential amplifier Output Pulse shaper Wide pass band 8kHZ Narrow pass band 1kHZ tuned, (variable) Digital output 1 5V pulse Digital output 2 20mA current loop riding on 12VDC supply Detected pulse length 1mS Size 32mm X 170mm X 16mm Connector Screw terminal Temperature 0°C - 40°C Protection 15VDC max supply voltage causes resettable fuse to operate