The invention is based on a measuring device consisting of a transmitter and two receivers. The transmitter transmits a sinusoidal signal, which is band pass filtered, amplified and converted into a squarewave signal. Depending on the distance of the transmitter to the individual receivers, the received signals have a certain phase shift in relation to each other and now enter two inputs in the actual measuring system. On the lines, a signal is sampled and each fed to a XOR gate at regular intervals. There, a logical 1 is passed, if only one square-wave signal was received. The duration of the 1 indicates the relative phasing of the input signals at the physical tap. Each XOR gate passes its signal to a counter connected to the system clock. At each clock, the counters who received during clock rise just a 1 from the XOR gate are incremented by one. The results of the individual counters vary, but take in a minimum of one place. As a result, the transmitter can clearly be located after calibration.
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