Cable Pulse System

A Self-contained battery powered unit fitted inside a plastic moulded case (140x80x36) mm approx. capable to connect to a 100 m reel of TV co axle cable. On every 10 ms, interval pulse of 50 ns is sent along the cable which display on an oscilloscope. When the pulse reflects from the end of the cable the time delay for the return pulse to be received is easily measured. The speed of the sigl calculated from the observation is measured equal to the speed of the light.