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Abstract

An apparatus for synchronized signal reception wherein a first signal of frequency f.sub.o is transmitted by a first unit and is reflected by a second unit, which thus transmits the reflected second signal. The reflected signal is modulated by information which is supplied by a coding device 27 in said second unit, which coding device generates a coded pulse train 27p in the form consisting of pulses, i.e. information symbols. A pulse generator 28 is controlled by the pulse train to emit a signal with one of two frequencies k.sub.1 and k.sub.2, respectively, in dependence upon the binary state of the pulse train. The signal is divided in a frequency divider 29 to provide frequencies k.sub.1 /n and k.sub.2 /n, respectively, which are supplied to the coding device 27, causing the coding device to emit said pulses with lengths which are related to the cycle lengths of frequencies k.sub.1 /n and k.sub.2 /n, respectively. The signal generated in the pulse generator 28 with the frequencies k.sub.1 and k.sub.2, is applied as a modulating signal to the modulator 26, which generates a single sideband with the alternating frequencies f.sub.o +k.sub.1 and f.sub.o +k.sub.2, respectively, constituting said second signal. The receiver 23 of the first unit receives the reflected second signal and scans said information symbols by means of the duration of the signal in dependence of the frequency of the signal.

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