| 摘要 |
<p>PURPOSE:To eliminate a blind area and to prevent jamming, by synchronously rotating two antennae so as to provide difference of about 90 deg. in an angle of rotation. CONSTITUTION:The order signal from the first angle order circuit 5 is applied to a servo motor 2 through a servo amplifier 4 to rotate antennae 1. At this time, the voltage proportional to the number of the rotations of the motor 2 is generated in a tacho generator 3 and fed back to the amplifier 4 to keep the rotational speed of the motor 2 constant. The order signal from the circuit 5 is converted to an order signal delayed by 90 deg. by the second angle order circuit 6 with respect to the other antenna system and applied to the motor 2 through the amplifier 4. Since one antenna is synchronously rotated so as to be shifted by 90 deg. with respect to the other antenna, a blind area can be eliminated and the interference between the mutual antennae can be avoided.</p> |
