What controls the radar pulse width (PW) by means of a rectangular direct current (DC)?

The modulator is responsible for controlling the radar pulse width (PW) by means of a rectangular direct current (DC). This component generates and shapes the high-voltage impulses needed to drive the radar transmitters, such as magnetrons or solid-state devices. By adjusting the pulse width, the modulator effectively dictates how long the radar energy is transmitted, which is crucial for determining the radar's range resolution and overall performance.

In radar systems, the ability to control pulse width allows operators to optimize the system for various targets and environmental conditions. A shorter pulse width can improve resolution and allow for better target discrimination, while a longer pulse width may enhance detection capabilities over longer distances but could reduce resolution.

Other components like the magnetron, synchronizer, and receiver/exciter play different roles in the radar system but do not directly control the pulse width in the same manner as the modulator. The magnetron generates microwave signals, the synchronizer coordinates timing operations within the radar, and the receiver/exciter manages the reception of echoes but does not alter the pulse characteristics as the modulator does.