What is a "tuning fork" in RADAR usage?

A "tuning fork" in RADAR usage refers to a device specifically designed to test the accuracy of RADAR units. When a RADAR operator uses a tuning fork, they produce a known speed (typically in the range used by the RADAR system) to validate that the RADAR is functioning correctly and accurately measuring the speed of objects. This process is important for ensuring reliability in speed enforcement and other applications where precise measurements are essential.

The tuning fork emits a specific frequency that the RADAR unit can pick up. If the RADAR properly reads this known frequency and corresponding speed, the operator can confirm that the RADAR equipment is calibrated and working as intended. This testing method is a standard practice among RADAR operators to maintain the integrity and accuracy of their measurements.

In contrast, the other choices describe functions that do not align with the specific role of the tuning fork in RADAR systems. Adjusting RADAR settings, measuring speed, or monitoring weather conditions are not the primary functions associated with a tuning fork.