What does this figure represent?

Thread Starter

CaptinKirk

Joined Oct 12, 2016
2
What does this figure represent?
It is in the context of Coaxial cable, but I can't really tell what does it describe, what versus what, and from what formula this plot came from?

 

ChrisTheEE

Joined Feb 23, 2017
5
The figure is meant to illustrate the relative performance for each parameter (power, voltage, attenuation) at a given impedance (x-axis) and why 50 Ω and 75 Ω cables became the standard. There's more to it than the particular article you linked to, including available dielectrics, but the point is that 50 Ω was chosen as a compromise between voltage and power handling characteristics. Your TV antenna is 75 Ω because that's where you get the lowest signal loss, and hence, best SNR/reception.
 
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