Advanced Qualification · A-007 Feedlines and matching · A-007-002-011
The velocity factor of a transmission line is the:
- A speed at which the signal travels in free space
- B speed to which the standing waves are reflected back to the transmitter
- C ratio of the velocity of propagation in the transmission line to the velocity of propagation in free space
- D impedance of the line, e.g. 50 ohm, 75 ohm, etc.
Correct answer: C — ratio of the velocity of propagation in the transmission line to the velocity of propagation in free space. From the official ISED question bank, verified word for word.
Why
The velocity factor is simply a comparison showing how much slower a radio signal moves inside a cable compared to its maximum speed in empty space. The full explanation — and one for every question — is in Pro.
Practise this section
Feedlines and matching at the advanced level: transmission line theory, impedance transformation, stubs and matching networks.