In electrical cables, the velocity factor mainly depends on the insulating material ( see table below ).
2.
Some typical velocity factors for radio communications cables provided in handbooks and texts are given in the following table:
3.
The velocity factor likewise applies to antennas in cases where the antenna conductors are ( partly ) surrounded by a dieletric.
4.
In a medium ( other than vacuum ), velocity factor or refractive index are considered, depending on frequency and application.
5.
For both forms ( pipe or paint ), the length is dependent on the velocity factor for the outer transmission line.
6.
For example, a typical velocity factor for coaxial cable is . 66, corresponding to a dielectric constant of 2.25.
7.
Transit time on a 1 meter cable is about 5 ns 3.33 ns with adjustment for velocity factor-- >.
8.
Regardless, any cable intended for radio frequencies will have its velocity factor ( as well as its characteristic impedance ) specified by the manufacturer.
9.
Applying the velocity factor of . 66, this results in a " physical " length of cable 1.67 m long.
10.
In the case of coaxial cable, where F = 1, the velocity factor is solely determined by the sort of dielectric used as specified here.
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