(J)3-66 Transmission Lines

Question 1

What is the meaning of the term velocity factor of a transmission line?

Answer 1

the ratio of the velocity wave on the transmission line divided by the velocity of light in a vacuum

Question 2

Nitrogen is placed in transmission lines to:

Answer 2

to prevent moisture from entering

Question 2

A perfect no loss coaxial cable of 7dB of reflected power when the input is 5 watts. What is the output of the transmission line?

Answer 2

1 watt

Question 2

What determines the velocity factor in a transmission line?

Answer 2

the dielectric of the line

Question 3

Referred to the fundamental frequency, a shorted stub line attached to the transmission line to absorb even harmonics could have a wavelength of

Answer 3

1/4 wavelength

Question 4

If a transmission line has a power loss of 6db per 100 feet, what is the power at the feed point to the antenna at the end of a 200 foot transmission line fed by a 100 watt transmitter?

Answer 4

6 watts