Transmission Lines Flashcards

1
Q

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

A

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

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2
Q

What determines the velocity factor in a transmission line?

A

Dielectrics in the line.

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3
Q

Nitrogen is placed in transmission lines to:

A

Prevent moisture from entering the line.

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4
Q

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

A

1 watt

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5
Q

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

A

1/4 wavelength

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6
Q

If a transmission line has a power loss of 6 dB 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?

A

6 watts

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