Feeders

Velocity Factor (Contd)

  • For open wire line K is about 0.85
  • For coaxial cable it is about 0.66
  • The big reduction in the speed of a wave in coaxial cable is due to the effect of the solid dielectric
  • A half wave when account is taken of the velocity factor of the cable is called an electrical half wave and it is always shorter than the free space half wave