Feature: Communications
Table 1: Technology suitability for this project
Developing applications The lack of suitable transceiver ICs and restrictions imposed by radio regulations do not make it easy to developing applications such as those described here, leading me to think there are no suitable transceivers because of radio regulations. In addition, by removing the rods and adding sensors and actuators to the model in Figure 5, the application discussed here can also be used to evaluate the operation of control systems with a scale model. For example, position maintaining whilst varying the water flow or depth control in shallow water. Another example might be wireless data download from an AUV to a submerged docking station, or contactless exchange of data between underwater devices. However, the biggest challenge is to increase the range under water. To do this, the
frequency has to be reduced from 27MHz to 13MHz. The best thing that could happen would be if OnSemi
releases a 3-30MHz version of the radio transceiver used. At this stage the chances of this happening appear slim, unless sufficient applications and modified radio regulations make it possible. One option that is currently beyond my reach is to design a 13MHz receiver myself. Its most important properties would be sensitivity and selectivity. The transceiver used in this project scores well in this respect and can be used as a benchmark. Furthermore, an antenna needs to be developed that can be integrated longitudinally into the hull of a model submersible. First tests have already been carried out with such an antenna, and look promising.
www.electronicsworld.co.uk February 2022 37
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