The heading marker pulse is produced by which device?

The heading marker pulse is produced by which device?

• A. Cursor on the CRT
• B. Range select switch
• C. Microswitch located on the antenna unit
• D. The display panel

Answer: (C)

The heading marker pulse is a timing signal tied directly to the antenna’s mechanical position, used to draw the heading line on the radar display at the correct azimuth. It is generated by the microswitch located on the antenna unit because this switch is part of the antenna’s rotation mechanism and can produce a pulse each time the antenna passes a reference azimuth. This ensures the heading marker on the CRT is synchronized with the actual heading reference. The other components don’t generate this pulse. The cursor on the CRT is simply a movable indicator for pointing or measurement, not a source of heading timing. The range select switch changes the display’s range scale, not a timing signal. The display panel shows information but doesn’t produce the heading reference pulse.

The heading marker pulse is a timing signal tied directly to the antenna’s mechanical position, used to draw the heading line on the radar display at the correct azimuth. It is generated by the microswitch located on the antenna unit because this switch is part of the antenna’s rotation mechanism and can produce a pulse each time the antenna passes a reference azimuth. This ensures the heading marker on the CRT is synchronized with the actual heading reference.

The other components don’t generate this pulse. The cursor on the CRT is simply a movable indicator for pointing or measurement, not a source of heading timing. The range select switch changes the display’s range scale, not a timing signal. The display panel shows information but doesn’t produce the heading reference pulse.