3.7 ST4300 multi channel recording
The ST4300 supports connection of up to four external hydrophones. These are connected via four
wetplugs at the base of the recorder. Each wetplug has a number adjacent to it relating it to the
channel selection in the deployment settings.
ST4300 output files are multichannel wav files where the channel numbering is from lowest to
highest physical channel number. For example - recording on channels 2 and 4 only would result in a
two channel wav file with the 1
st
wav channel pertaining to the 2
nd
physical channel.
Recording endurance will be reduced by increased channel count due to both increased power
consumption and data rate. We recommend using our online endurance calculator to make these
calculations. Note that the calculator assumes use of HTI-96-MIN hydrophones which consume
approximately 3.6 mW. Use of other hydrophones may give different results.
Compatible hydrophones can be obtained from High Tech Inc USA with model code:
HTI-96-MIN/3V/Low Noise/SoundTrap/-165dB.
This model has bandwidth of 30 kHz. For higher frequency models we recommend discussing your
requirements with HTI.
While use of other manufacturers hydrophones is possible we advise a cautious approach. To be
compatible hydrophones must operate on a 3V supply with a max power draw of 10 mW. Contact
OI for more information including connector pin-out.
Is is critical that unused channel connectors are protected with dummy wet plugs. Failure to do so
will result in damage.
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