Created Saturday 08 May 2021
The Velocity Factor (VF) is a property of transmission lines, specifically used with coaxial cables. Since any dielectric permittivity greater than 1 (air/vacuum) will have the effect of slowing the phase velocity of a wave, the VF is given as a percentage representing that reduced phase velocity.
The velocity factor is simply the inverse of the square root of the relative permittivity. Some common phase velocities are given below.
|Coax Type||Dielectric Material||VF||εr||Z0|
|T10 Drop Cable||Foam/HDPE||85%||1.38||75 ohm|
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