Hydrophone
The hydrophone is an HTI-96-min. You will receive a separate calibration sheet for the hydrophone.
The default system gain is full scale = 0.79 Vpeak (i.e. +2 dB gain).
For example, hydrophone with sensitivity of -170 dBV/uPa will have a clip level of 168 dB.
Batteries
LHC uses D-cell batteries, which power both the audio recorder and camera.
The expected deployment duration will be calculated and shown on the display assuming that 12 D-cell
batteries have been installed.
Recording Settings
Settings are programmed on the audio board through three buttons on the front.
Press ENTER (bottom button) to scroll through menu choices. The Up and Down buttons can be used to
change the setting.
Menu
Function
UP+DN->Rec
Press UP and DOWN buttons simultaneously to start recording
Rec
Record duration in seconds
Slp
Sleep duration (seconds)
Year
Real-time clock Year
Month
Real-time clock Month
Day
Real-time clock Day
Hour
Real-time clock Hour
Minute
Real-time clock Minute
Second
Real-time clock Second
Mode
Norm: Normal record mode. Camera will alternate recording and sleeping
continuously.
Diel: Camera will alternate recording and sleeping during a time window.
Start HH
Hour of day to start recording in diel mode.
Start MM
Minute of day to start recording in diel mode.
End HH
Hour of day to end recording in diel mode.
End MM
Minute of day to end recording in diel mode
Recording Schedule
Normal Mode:
The camera will record on a duty cycle continuously. For example, with Rec=60 s and Slp=240s,
the camera will record for 60 seconds (1 minute) and sleep for 240 seconds (4 minutes),
yielding a duty cycle of 1 minute of recording for every 5 minutes.
