A sensor system for diagnosing dental conditions includes a sensor unit which is in contact with an oral fluid such as saliva or gas, and which is operative to provide detectable signals indicative of at least two of hydrogen ion concentration, hydroxyl ion concentration, calcium, phosphate, sulfur, sulfur containing compounds, nitrogen containing compounds, microbial metabolites, and microbes. The beamforming networks disclosed herein generate less losses than conventional ones and in some cases, do not require active switching, making them completely passive. The method further includes receiving feedback on the transmission of the first part of the codeword. The charge holder is capable of being secured within the carrier. The MSC may make this determination on the basis of information stored in a local database that indicates the method employed by other telecommunications devices, such as other MSCs, Visiting Location Registers, or Home Location Registers, within the system. A first female part adapted to be mounted on one of the elements is formed with a socket complementary to one of the tongues and is provided with a formation that latches with the tab of the respective tongue when same is inserted in the socket.