Where is a microswitch located and what does it do?

Where is a microswitch located and what does it do?

• A. Located on the CRT; it starts the sweep
• B. Located on the antenna unit; it produces the heading marker pulse
• C. Located in the transmitter; it modulates the power
• D. Located on the display panel; it resets the indicator

Answer: (B)

A microswitch is placed on the antenna unit and is triggered as the antenna passes a defined reference position each revolution. When it closes, it sends a brief pulse that becomes the heading marker pulse on the radar display. This pulse creates the heading marker on the screen, giving you a reference to the ship’s heading for bearings and radar plotting. It isn’t used to start the CRT sweep, modulate transmitter power, or reset the display—those functions are handled by other parts of the system.

A microswitch is placed on the antenna unit and is triggered as the antenna passes a defined reference position each revolution. When it closes, it sends a brief pulse that becomes the heading marker pulse on the radar display. This pulse creates the heading marker on the screen, giving you a reference to the ship’s heading for bearings and radar plotting. It isn’t used to start the CRT sweep, modulate transmitter power, or reset the display—those functions are handled by other parts of the system.