Abstract: A process and apparatus for improving the resolution of square, subdivided signals by synchronizing the signals with an auxiliary clock signal. The signals are further conditioned by switching logic elements which, in dependence upon adjacent signals in the subdivision order and upon the auxiliary clock signal, only allow the states of the signals to change at predefined times.

Abstract: Two-way radio communication system with several fixed stations serviced by a fixed dispatching center and with at least one mobile station. The fixed stations transmit at different frequencies and the mobile station at one frequency. The mobile station contains means for hunting the frequency with the best reception and thus receives only the fixed station having the best possible transmission conditions. All stations contain means ensuring that the dispatching center is connected only to the receiver of the fixed station, the transmitter of which is received by the mobile station.