Coaxial cables are used as transmission lines for radio frequency signals. But sometimes it is difficult to detect the transmission signal from input to output. Now, this is a simple cable tester, using four 2-input NOR gate IC 4001. As shown in the circuit diagram, test the coaxial cable by connecting to points A and B. The illuminated LED1 indicates that the cable string is connected internally; the illuminated LED2 indicates that the cable is disconnected, and the illuminated LED3 indicates that the cable is good.
