Why 50 Ohms?
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Published 2022-06-02
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All Comments (10)
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Cable companioes went with 75ohm to minimize losses because they extend such long distances. Radio mostly went 50ohms because its a great tradeoff between loss and cost...
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classic engineering round off
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thank you great explanations
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With engineering round off 😂
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But the equipment that the 50 or 75 Ohm stamped coaxialcables are connected into is several Mega Ohms, so it must be something to do with high frequency measurements or something?
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How did they come up with those graphs, experiment or via Maxwell's equations? If equations, how were they derived?
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This begs the question, why is there also 75 Ohm coaxial cable for video, TV etc?
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Conveniently, the resultant ratio of inner and outer coaxial diameters (which, along with the dielectric of the insulation, sets the characteristic impedance of coaxial cable) is also practical to manufacture. It would have been ugly if the optimum values were (for example) 27 giga-ohms or 27 pico-ohms.
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How did they come up with those graphs, experiment or via Maxwell's equations? If equations, how were they derived?
