| 摘要 |
PURPOSE:To perform stable indication and facilitate reading by controlling the addition and subtraction of a reversible counter counting clock pulses according to the shases of demodulated waves. CONSTITUTION:The output of an antenna system Al is applied to a goniometer Gm, and the output thereof is applied to a balanced modulator M and is modulated by the output of a low frequency oscillator O1. The output of an antenna As is applied to a 90 deg.-phase shifter 1, the output whereof and the output of the modulator are combined and applied to a receiver R. The output of the receiver R is applied through a detector Kf, a filter F1 and an amplifier A1 to a rectifier H, by which the DC voltage corresponding to the level of a demodulation signal is obtained and is applied to a comparator C. The output of an oscillator O2 is applied through a gate G1 or G2 to frequency dividers D1, D2, the outputs whereof are applied via a selector J to a reversible counter N. By the output thereof, a stepping motor Sm is run. The motor Sm is controlled by the output of a phase comparator Kp. |
