An interferometer direction-finding arrangement is described having two physically separate antennas which are connected periodically and alternately to a common reception channel. The oscillation of a heterodyne oscillator is fed via a controllable phase modulator to a frequency converter in order to convert the received signal to an intermediate frequency. The phase modulator is switched between two phases in synchronism with the antenna switching, the phase shift between which phases can be adjusted by means of a control voltage. Phase demodulation determines the phase modulation of the intermediate-frequency received signal and a regulator uses the output signal of the phase demodulator to derive a regulation voltage for adjusting the phase shift of the phase modulator, in such a manner that the phase modulation of the intermediate-frequency received signal disappears. The phase shift setting of the phase modulator (and the associated regulating voltage) is then a measure of the incidence direction of the received wave.
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