| 摘要 |
PURPOSE:To obtain the direction finder having good accuracy with comparatively less cost, by separately multiplying the AC voltage of the two phase AC generator driven in interlocking with the search coil of goniometer and the modulation signal of the modulator, and inputting the output to the horizontal and vertical deflection circuit of the cathode ray tube. CONSTITUTION:The induced voltage of the directional loop antenna 1 is fed to the goniometer 2. The output voltage of the two phase AC having the phase difference of 90 deg. of the two phase AC generator 13 driven in interlocking with the search coil with the motor 5 driving the search coil of the goniometer 2 is input to the multiplication circuits 11, 12. On the other hand, the induced voltage of the goniometer 2 is modulated with the transmission signal from the oscillator 8 at the modulation section 7 via the receiver 6. The modulation signal enters the multiplication circuit, it is multiplied individually with each voltage of the two phase AC, enters the vertical and horizontal deflection circuit of the cathode ray tube 10 and the direction of incoming electromagnetic waves is displayed. Thus, the direction finder having good accuracy can be obtained with comparatively less cost. |
