E9F - Antennas and Transmission Lines
Extra Class
Transmission lines: velocity factor, characteristic impedance, stub matching
12 questions | Updated: Dec 9, 2025
What is the velocity factor of a transmission line?
Which of the following has the biggest effect on the velocity factor of a transmission line?
Why is the electrical length of a coaxial cable longer than its physical length?
What impedance does a 1/2-wavelength transmission line present to an RF generator when the line is shorted at the far end?
What is microstrip?
What is the approximate physical length of an air-insulated, parallel conductor transmission line that is electrically 1/2 wavelength long at 14.10 MHz?
How does parallel conductor transmission line compare to coaxial cable with a plastic dielectric?
Which of the following is a significant difference between foam dielectric coaxial cable and solid dielectric coaxial cable, assuming all other parameters are the same?
What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is shorted at the far end?
What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is shorted at the far end?
What impedance does a 1/8-wavelength transmission line present to an RF generator when the line is open at the far end?
What impedance does a 1/4-wavelength transmission line present to an RF generator when the line is open at the far end?