Co-axial cable tester

Co-axial cable is used as a transmission line for radio frequency signals. But sometime it is difficult to detect transmitted signal from input to output. Now, here is a simple project “Co-axial cable tester” by innovative group Dreamlover technology using quad 2-input NOR gate IC 4001.

Testing of co-axial cable is gone by connecting to point A and B as shown in circuit diagram. Glowing LED1 indicate string of cable is internally joined; where glowing LED2 indicate the cable is open and glowing LED3 indicate cable is good. Short-circuit of cable is indicated by glowing two different LEDs. In this way “co-axial cable tester” is used to check whether the cable is open, short-circuit or good by glowing different LEDs.

circuit diagram of coaxial cable tester


Resistors (all ¼-watt, ± 5% Carbon unless stated otherwise)

R1 – R4 = 1 KΩ

R5 = 100 KΩ


IC1 = 4001 (quad 2-input NOR gate)

LED1 = Red

LED2 = yellow

LED3 = Green

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