NAUTA scientific

instruments for science

RASP prototype


with remote control and position locator
here afterwards "RASP PT/RC"
The RASP PT/RC is an underwater acoustic recorder based on the following hardware:
- one Sensor Technology SQ26 preamplified hydrophone. with 30m of cable;
- one Yamaha Pocketrack W24 digital audio recorder, with 96kHz of sampling rate at 24bit.
- the standard Yamaha infra-red remote control, modified in order to interface it with the GSM remote control Teltonika.
- The GSM remote control Teltonika TWCT22
- The position transponder Teltonika MH2000

Parts:

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HYDROPHONE:
The Sensor Technology SQ26 page is here:
http://www.nauta-rcs.it/english/page117/page27/page29/
This is a widely used transducer with large frequency band and simple use.

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The recorder uses a standard AA battery. NON RECHARGEABLE LITHIUM BATTERIES must be preferred.
The recorder has a built-in timer feature with a single repeatable recording period over the 24hrs. This period can be freely configured by the user, skipping the remote control.
The recorder uses standard microSDHC memory cards, up to 32GB. Cards must be formatted by the recorder in order to work properly. Most standard cards will correctly work. Yamaha publishes a list of tested and approved cards on the website.

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The remote control uses the provided 12V lead/gel sealed battery. The battery must be recharged and connected to the remote control in order to operate.
REMOTE CONTROL:
The Teltonika TWCT22 GSM remote control is described here:
http://www.teltonika.eu/en/pages/view/?id=957

The programming software is here:
TWCT22 programming software
the software runs on MSWindows, and requires a COM: port (RS232) to connect the TWCT22 to the computer via the provided cable and the front port on the control unit.
The remote control needs a valid GSM SIM card, and the relative phone number, to correctly operate.
PIN code of the SIM card must be disabled to easily operate and configure the system.
The SIM card must have valid credit available and must be able to send and receive SMS - text messages.

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The position transponder needs a valid GSM SIM card, and the relative phone number, to correctly operate.
PIN code of the SIM card must be disabled to easily operate and configure the system.
The SIM card must have valid credit available and must be able to send and receive SMS - text messages.
POSITION TRANSPONDER:
The GSM GPS transponder used in these units is the Teltonika MH2000 described here:
http://www.teltonika.eu/en/pages/view/?id=983
The unit is a personal locator, featuring a GPS and a GSM engine.
It also features the ability to use the GSM network to return an approximate position when the GPS signal is low or not available. This unique feature requires the free registration to a third part service as reported on the manual addendum.

The cable outside is 30m long and can be kept rolled if required sensor depth is shallower than -30m.
Each cap must be sealed with the provided gasket (black flat rubber gasket).
Each cap must be sealed with FOUR STAINLESS STEEL screws and their relative eight washers. All screws are provided.
Screws must be positioned and gently turned by hand in opposite pairs.
All screws must be tightened with the provided tools.
CANISTER:
These units are arranged in a UV-stabilized thick-wall PVC canister suitable for pressures up to 16ATM.
The canisters have been delivered in two different sizes (two small units and one larger unit). The larger unit can host extra equipment if needed.
We can provide extra canisters in any of the two sizes.
The canisters have interchangeable caps with integrated hydrophone cable and hydrophone. The hydrophone cable is resinated with a PU resin and the cable inside the canister is terminated with a miniJack plug with the needed cable abundance.

Procedures:

1.

Get familiar with the recorder!
Decide and check the recording setup, the AVL (recording level, automatic or not), the sampling rate, the bit depth.
Decide if you want to add an additional microSD (check and format it), check the duration of the specific batteries you are going to use.
Connect the hydrophone, select the external microphone and check that the Plug-in-Power is enabled.
Be sure to be familiar with the recorder activation. For example: with the standard setup the REC button has to be pressed twice in order to start the recording.

2.

Use a GSM SIM with the PIN set as DISABLED.
To disable the PIN request you can use a standard phone and disable the PIN request using the phone menu (usually somewhere in the setup..security...PIN menu).
Get familiar with the GSM remote control!
The remote control requires a GSM SIM card, able to send and receive SMS - text messages.
The GSM requires to be powered in order to be programmed. You can provide power via the 12V battery or via an external power supply.
The GSM remote also requires some programming:
- download and install the programming software;
- use a computer with an RS232 serial port and connect the provided cable to the computer port and the GSM remote (the cable has a standard serial port at one end and and RJ45 plug at the other end, connect the RJ45 to the port on the front of the GSM remote);
- start the programming software;
- set the correct date and time, but always consider that the timer will stop when the battery will be disconnected (there is no internal backup battery);
- decide the users that will be able to send and receive commands;
- program their names and numbers in the unit, as USER, and create GROUPS according to equivalent user levels.
- program the actions and logics
- CONSIDER that the route 1 acts as a single REC keypress and route 2 acts as a single STOP keypress.
- be sure to make the tests with the antenna connected and with the PIN request (on the SIM card) disabled.
- test your programmed sequences, especially if they are complex and rely on the internal timer of the GSM remote.

3.

Use a GSM SIM with the PIN set as DISABLED.
To disable the PIN request you can use a standard phone and disable the PIN request using the phone menu (usually somewhere in the setup..security...PIN menu).
Get familiar with the position transponder!
The transponder needs almost no programming, but it is recommended an optional registration to the online service that provides estimated positions related to the GSM network.

Test the WIM? command sending an SMS to the unit.

The unit will return the position in a few minutes.

4.

Get familiar with the canister!
The canister is made of a UV stabilized Thick-wall PVC pipe, terminated with a standard gasket, a cap, its screws and gaskets.

All parts are rather standard in hydraulic warehouses and it should be easy to find spares and optional parts anywhere in Europe.
The walls can carry over 16ATM. We have tested the unit at about -100m and this depth must NOT be exceeded. Please mind that if the unit is submerged the GSM network can not communicate with the devices. This unit can receive remote commands only when at surface.

The canister is made to be stable in the water with the cap towards the bottom (the cap and the screws are rather heavy), and the lead-gel battery inside the unit also provides extra weight to stabilize the unit.
The units have a flotation aid to help keeping about half of the canister out of the water (yellow foam protected by the net).
The unit is anyway small, so extra stability can be obtained using a 2 or 4 point mooring. A simple scheme is reported.
Always be sure to tighten the screws (first by hand then using the tools) on the gasket using the same sequence used when changing the car tires: screw 1, screw 3, screw 2 and then screw 4.