Simulation of the A-Display of an SA-2 Search Radar.
Click the power button in the center to start the simulator.
The vertical line at the left represents the transmitter
Detetcted targets are the vertical lines to the right. One is a double target (it has a line in the middle,) and is moving toward the ship. The other is a larger stationary target.
The "Target Motion" button toggles the target motion.
The "Target Direction button reverses the direction of motion.
On the actual radar, the setting of the "Range" knob determines which scale to read from the screen.