RADIO-TELEPHONE SYSTEM OPERATING IN THE SAME WAY AS LOCAL OR SECONDARY TRANSMISSION EQUIPMENT

摘要

The invention concerns a radio-telephone system capable of providing a temporary basic telecommunications service to regions with no coverage or insufficient coverage. Proposed is a system with a stellate operational structure characterized by a fixed base station and a multiplicity of mutually independent subscriber stations. At the base station, the various telephone channels are processed as a frequency-multiplexed signal. This multiplexed signal is preferably superimposed, with angle modulation, on an HF carrier wave and transmitted on a broad-band radio channel. In the direction of transmission from subscriber to base station, the subscriber stations transmit in narrow-band channels which are each of different frequency. For transmission of signalling and control commands, the system includes a special organization channel which is also integrated in the frequency-multiplexed signal. Compared with prior art procedures, this method has the advantage that very high requirements are placed on the intermodulation values of the assemblies and on the stability of the frequency-processing only for the processing of the multiplexed signal in the audio-frequency, i.e. low-frequency, range of the transmitter.