Abstract: A base transceiver station of a digital mobile telecommunication system comprising a master base transceiver station device (master BTS device) and a plurality of remote radio frequency units separated from the master BTS device and installed at a remote site therefrom for processing radio frequency signals. The master BTS device and the radio frequency units are interconnected via a remote interfacing unit. Therefore, the base transceiver station can become so much smaller in size and lighter in weight that it can be readily installed in a place effecting the optimum propagation. Furthermore, the remote interfacing unit can remotely control and monitor the status of the remote radio frequency units via a radio frequency cable without using a separate control cable.

Abstract: The present invention aims to improve poor cellular reception at home with minimum cost and extreme ease. In order to avoid the oscillation problem and to acquire proper antenna isolation, traditional residential repeaters consist of an indoor repeater unit and an outdoor antenna wired to the indoor repeater. This design makes installation difficult and cumbersome. In addition, signal loss along the cable is inevitable.

Abstract: The present invention relates to an apparatus for measuring input and output levels of base station transmitters in the mobile communication system, for allowing measurement of an input/output level of a transmitting stage so as to check an operation state of a digital block through detection of an intermediate frequency (IF) output level of the transmitting stage and an operation state of a transmitter by the frequency allocation (FA) through measurement of an output level of the transmitter. The present invention has splitters on paths to split transmitting intermediate frequency (IF). A split signal over one path is regularly coupled to the system and a split signal over another path is sent to a power detector to measure power. A phase locked loop (PLL) local signal is generated and transmitting RF signals up-converted by the FA are converted into specified IF signals to measure power. The two measured power values are compared to determine a state of the transmitter.