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Attenuation
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=== Coaxial and general RF cables === The attenuation of RF cables is defined by: : <math>\text{Attenuation (dB/100m)} = 10\times\log_{10}\left(\frac{P_1\ (W)}{P_2\ (W)}\right),</math> where <math>P_1</math> is the input power into a 100 m long cable terminated with the nominal value of its characteristic impedance, and <math>P_2</math> is the output power at the far end of this cable.<ref>{{cite web |title=Technical Information β Coaxial Transmission Lines |url=http://www2.rfsworld.com/RFS_Edition4/pdfs/TechInfo_Edition4_639-672.pdf |website=rfsworld.com |archive-url=https://web.archive.org/web/20180712160805/http://www2.rfsworld.com/RFS_Edition4/pdfs/TechInfo_Edition4_639-672.pdf |archive-date=2018-07-12 |page=644 |url-status=dead}}</ref> Attenuation in a coaxial cable is a function of the materials and the construction.
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