OK. I understand the definition of impedance. And I know the various permutations of ohm's law (E=I x R, etc.). I won't even quibble about the need to use 75ohm cable for video signals. But what I don't understand is how do you actually measure this value for an unknown cable. What does a cable maufacturer do differently between 50ohm RG-59 and 75ohm RG-59? What is actually different between 50ohm and 75ohm connectors?
I realize that I'm generalizing between the terms impedance and resistance, and maybe that's the whole issue. But, I'm still thinking that this is something I should be able to measure with my ohmmeter, but I can't figure out how. Just something I've always wondered.
I realize that I'm generalizing between the terms impedance and resistance, and maybe that's the whole issue. But, I'm still thinking that this is something I should be able to measure with my ohmmeter, but I can't figure out how. Just something I've always wondered.