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How the Systems Work The Precision Time Systems works via a radio transmitter in the belt pack worn by the officials. Attached to the belt pack is an omni directional microphone which docks in the microphone adapter on the lanyard just below the whistle. When an official blows the whistle, the belt pack recognizes the frequency of the FOX 40 whistle and sends a radio signal to the base station receiver that is connected to the scoreboard controller, stopping the clock at the speed of light. The Precision Time System not only stops the clock, it gives the official timer the ability to restart the clock, as well as each official. Each belt pack has a restart button, so the clock can be started from the floor, if necessary.
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