![]() ![]() To display the stopped time, binary outputs of the decade counters must be converted to be easier readable on 7-segment-displays. Because the spreading rate of radio waves is identical with velocity of light, you can calculate the distance between the two devices (measuring points) by a given travel time of the radio waves.The stopwatch contains a crystal with a clock rate of 30 Megahertz and a couple of decade counters (High- Speed CMOS). It is used to stop the time the emitted radio wave is travelling. ![]() To put it simply, the main part is an exact stopwatch, which measures time with a resolution in nanoseconds.
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