What is frequency dependent?Edit to Add. You cannot use a multimeter, which measures DC resistance in Ohms, on a coaxial cable. The 50Ω on a cable is the magnitude of a complex number, which you may remember is computed as:
\( Z\;=\;\sqrt{Re^2+Im^2} \)
AND this value is frequency dependent.
No, it is the characteristic impedance of a transmission line, which is well-modeled by the Telegraphers Equation.Edit to Add. You cannot use a multimeter, which measures DC resistance in Ohms, on a coaxial cable. The 50Ω on a cable is the magnitude of a complex number, which you may remember is computed as:
\( Z\;=\;\sqrt{Re^2+Im^2} \)
AND this value is frequency dependent.
Answered here already as you know. https://forum.allaboutcircuits.com/...usually-50-ohm-resistance.199208/post-1889444Do not deviate from the original question; is was about antennas and see comments oriented toward transmission lines. An antenna exhibits 50Ω at only one frequency.
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