| 摘要 |
PURPOSE:To compensate cross polarized wave interference at each communication signal wave with simple constitution by providing a reference hat generating means generating a beat frequency and control signal generating means generating a control signal of a compensation signal coupling means from an output of the beat detecting means so as to control the output of the beat detection means to be minimized. CONSTITUTION:A signal V(F1) transmitted from a transmitter 1 and a cross polarized wave interference component h(F2) transmitted from a transmitter 1' and generated in a propagation line are received to a receiver 2 for vertical polarized wave of a reception station, an amplitude modulation component in a frequency F due to beat between the V and h is generated in the reception output and its amplituide and phase are depending on the cross polarized wave interference component (h). Since the receivers 2, 2' are converted into an intermediate frequency by a common local oscillator 22, the intermediate frequency signal of the receiver 2' is branched and its amplitude and phase are controlled by a variable coupler 5, then a signal of the same amplitude but opposite phase with the cross polarized interference component (h) is obtained so as to compensate the cross polarized wave interference. This is applied similarly as to the horizontal polarized wave and the cross polarized wave interference is compensated at each communication signal wave. |
