| 摘要 |
PROBLEM TO BE SOLVED: To clearly indicate the correct receiving directions in both areas of low and high satellite signal levels by varying the output signal level from the bias voltage level via a detection circuit. SOLUTION: The intermediate frequency satellite signal received from a frequency conversion circuit 12 is inputted to a direction adjustment display 15 via an amplifier circuit 16. The display 15 is composed of a detection circuit 17, a 1st comparison circuit 18, a display tool 19, a 2nd comparison circuit 20 and a bias voltage generation circuit 21. When the DC signal received from the circuit 17 exceeds a prescribed level VR, the circuit 18 turns off the LED of the tool 19 to change the display state. When the DC signal of the circuit 17 exceeds a prescribed level Vr higher than the level VR, the circuit 20 actuates the circuit 21 to reduce the bias voltage Vo of the circuit 17 by a degree equal to the peak holding valueΔV.
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