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Hydrophones are normally ordered unterminated. In order to splice the hydrophone cable to a suitable underwater pigtail cable (which is delivered with one connector; the other side is open) an inline cable splicing kit must be used:
Interface between Teledyne AQ-18 Hydrophone / 6 channel mini-streamer and Geode Recording system - click to see large version.
Recommended AQ-18 decoupling and wiring.
The recommended decoupling is done in the interface box shown below. The interface is also furnished with a DC/DC-converter in order to provide a clean 12 Vdc power source for the hydrophone.
Supplier: Sigfrance, 6 channels
If a USB based GPS should be used, there is a problem as the Geode software only accepts serial port in the Keep('COM1') to Keep('COM4') range, see screenshot below.
The USB based GPS will normally be assigned to a COM number in a higher range. So a remapping of COM port assignment need to be done.
Geode software serial setup menu.
Default COM port assignment and NMEA telegram output from ordinary USB/GPS shown below.
Data from USB/GPS, default selection of telegrams.
Re-assigning COM port to fall within the 1-4 range is accomplished from Control Panel -> Hardware -> Comport -> (properties of USB/GPS port)
In advanced settings, you can force comport setting to an available number within the 1-4 range that Geode software accepts.
Ref. notes on this page.