Air repeater New and innovative TETRA system from Semco Maritime makes offshore oil and gas production facilities a safer place for personnel A rock solid and reliable communication system is an absolute necessity on every offshore facility and this also applies to the numerous new offshore facilities in the North Sea and around the world. First and foremost it is a question of providing the best safety possible for the offshore staff. The SemTETRA solution ensures coverage inside production and accommodation facilities and provides clear communication which is essential in the daily work, especially if a hazardous situation should occur. Tests have shown that if the TETRA base station is located up to 500 meters away from the modules, it is not possible to use the radios inside the module because the steel construction acts as a faraday cage in combination with strong interference from power lines and reflections inside the module. In order to solve this problem Semco Maritime has developed an air to air TETRA radio repeater solution based on an active repeater installed in the steel modules and a special antenna system. This solution provides a seamless coverage inside the module regardless of location. You need no manual interactions when entering the modules. All calls will be routed directly to the user, whether the user is inside or outside the modules. The active repeater solution is based on a TETRA repeater that will pick up the signal from outside the modules, using a directional or omnidirectional antenna (depending on the solution) and repeat this inside the steel construction via two-directional antennas specially designed to minimize the interfering and reflections inside the modules. If needed a radiation cable system and amplifiers can be added for coverage in each accommodation level. The repeater can be equipped with a monitor board, which is connected to a LAN network. Once connected, the repeater will provide SNMP messages (Simple Network Management Protocol) to safely and remotely monitor the condition and performance of the repeater. a. Alternatively the repeater can be provided with an embedded wireless remote monitoring system checking for system status and providing an interface for supervision of e.g. external UPS The centralised monitoring software forwards notifications to an operator of the system, and/or to predefined e-mail accounts. A small power backup (UPS) ensures continued SemTETRA coverage in the event of turbine power outage. Facts: • Field proven solution • Full radio coverage in all models • Low cost and easy installation • Avoiding multipath communication causing communication errors • Special frequencies and spacing available in accordance with regulations in different countries • Green technology, low power consumption, and only active when required • Online remote monitoring of repeaters • Semco Maritime can offer full radio planning for the solution • Seamless coverage inside the modules • Fully transparent operation
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