The Development of Airborne Weather Radar System

Fig.1.18.Structural block diagram of the RADAR indicator.
Synchronizer pulse provides simultaneous launch of the RADAR transmitter and sawtooth generator pulse range sweep which are applied to the deflection system (EBF). When the antenna rotation is switched off the electron beam draws a line on the screen radially from the center to the edge of the screen. The angular position of this line is determined by the position of the deflection coil and conforms to the antenna position. The angular position of this line is determined by the position of the deflection coil and conforms to the antenna position. When the antenna rotation is switched on the synchronous rotation of the antenna and CRT deflection system begin their operation. This forms radially circular sweep on the screen.
In addition, rectangular pulses for the illumination of direct run range sweep are fed to the control electrode of the CRT. Reverse sweep is terminated by applying a bias voltage to the CRT control electrode.
The video signal voltage from the receiver’s output goes through a video mixer to the CRT cathode and controls the intensity of the electron beam. When the ignition threshold is exceeded under the influence of this ray luminophore glowing on the screen begins. The brightness depends on the intensity of the electron beam. As a result, the screen displays the brightness marks from the targets, local terrain features and rain formations, etc.
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