Satellite Earth Stations (SES); Land Mobile Earth Stations (LMESs) Operating in the 11/12/14 GHz Bands Providing Low Bit Rate Data Communications (LBRDCs)
This final draft European Telecommunication Standard (ETS) provides specifications for the standardisation of the characteristics of Land Mobile Earth Stations (LMESs) with both transmit and receive capabilities in order to ensure general safety and to limit interference to radio communications services. The LMESs operate as a part of a geostationary satellite network providing Low Bit Rate Data Communications (LBRDC) for land mobile applications. These LMESs generally have the following characteristics: - the LMESs could be either vehicle mounted or portable equipment; - the LMESs could consist of a number of modules including a keyboard interface to the user; - the LMESs operate in a 3??atellite spacing environment with linear polarisation; - the antenna of the LMES may be omnidirectional or directional with a means of tracking the satellite. Because the transmissions from the LMES to the satellite in the 14@00 - 14@25 GHz band fall under a secondary allocation@ the transmissions should not cause harmful interference to primary services (e.g. Fixed Satellite Service (FSS)) and at the same time cannot claim protection from harmful interferences from those services. The main specifications are contained in three categories related to: - safety: to protect personnel@ public and goods from unsafe operating conditions or equipment; - unwanted emissions: to protect terrestrial and satellite radio services from harmful interference; - LMES control and monitoring: to specify a minimum set of Control and Monitoring Functions (CMF) that shall be implemented on each LMES in order to minimise the probability that they originate unwanted transmissions that may give rise to harmful interference to other systems. This ETS deals with two types of specification: a) Essential normative requirements (indicated in Clause 4) Requirements are specified in order to protect other users of the frequency spectrum from unacceptable interference. In addition@ requirements are specified for the purposes of general safety. b) Recommendations (indicated in Clause 5) Recommendations are specified relating to matters of general safety@ minimisation of interference to other users of the radio spectrum and for the provision of protection of the LMES against electromagnetic interference from other systems. All tests related to the requirements shall be performed and the results entered in the data sheets of the test report. The ability to comply with the recommendations shall also be noted in the data sheets of the test report. All parameters and operational conditions declared by the manufacturer shall be entered in the test report.