{"id":3955,"date":"2021-10-22T10:16:57","date_gmt":"2021-10-22T10:16:57","guid":{"rendered":"https:\/\/www.clooms.com\/?p=3955"},"modified":"2023-01-16T06:57:12","modified_gmt":"2023-01-16T06:57:12","slug":"50-ohm","status":"publish","type":"post","link":"https:\/\/www.clooms.com\/50-ohm\/","title":{"rendered":"50 Ohm: Why is it considered as a standard?"},"content":{"rendered":"\n
If you have a lot of work around coax cables<\/strong><\/a>, you know a wide variety. You can get the most common impedances: 50 Ohm and 75 Ohm, which we use as video or antenna cables. However, the range starts from 32 ohms and goes up to 124 ohms generally. Among them, the 50-ohm<\/strong> coaxial cable can carry out the power and voltage signals just like the output of a transmission circuit<\/strong><\/a>.<\/strong> It is the standard specified on most of the appliances. This article will see how it has proven to be a better choice in some cases and its research.<\/p>\n\n\n The standardization process dates back to the early 1930s. It was the time when the young scientists were searching on Telecom best practices. They were designing \u201cair-filled coaxial cables<\/strong><\/a>\u201d to transfer several kilowatts of power from radio transmitters. The engineers have a few objectives, to have the highest authority and voltage transfer, with the lowest possible loss. <\/p>\n\n\n\n As the research moved forward, the scientists concluded that it is impossible to gain all three benefits since<\/p>\n\n\n the internal dielectric requires 77 Ohms for most air-filled coax cables, and it might work on 50-ohm for other wires as well.<\/p>\n\n\n Between the center and outer conductor of the air, dielectric coax cables need 60-ohms impedance approx.<\/p>\n\n\n Maximizing the impedance at about 30-ohms.<\/p>\n\n\n\n Note that the transfer has to be done across hundreds of miles. For that, you will need long transmission lines spread over the distances. However, as the distance increases, the power handling capabilities are lessened.<\/p>\n\n\n\n As you can see, not all the three objectives match each other in impedance<\/a>. In other words, you cannot have the highest power and voltage transfer, with less loss, all on one impedance value. Thus, you have to consider some tradeoffs while choosing an option.<\/p>\n\n\nTable of Contents<\/h2>\n
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History of 50-Ohm Coax Cable<\/strong><\/h2>\n\n\n
Less attenuation or loss<\/strong> <\/h4>\n\n\n
The highest voltage<\/strong> <\/h4>\n\n\n
Maximum power transfer<\/strong> <\/h4>\n\n\n