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Old 10th Oct 2018, 2:45 pm   #22
G8HQP Dave
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Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
Default Re: Determining Zo for coax cable

Another reason for measuring it is that this could show up coax which has moisture inside it. Water has high permittivity so it would not take much water to increase the capacitance and so reduce the characteristic impedance.
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