It sounds like you are referring to the inline resistance of the cable, not the impedance. The impedance is based on the outer to inner conductors and dialectic separator between. Typically cables of that type will have a 1 or 2 ohm resistance and an impedance of 50 to 75 ohms. I am not able to make that measurement as I am not where the cables are located. Perhaps you could get someone to measure the cable resistance.

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• Barry L on Feb 19, 2018