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Subel. E
6 questions
Subelement E

Antenna Systems

Section 40

Transmission Lines

The VSWR of a microwave transmission line device might be measured using:

  • A dual directional coupler and a power meter.
  • A network analyzer.
  • A spectrum analyzer.
  • Correct Answer
    A dual directional coupler, a power meter, and a network analyzer.
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The impedance total (ZO) of a transmission line can be calculated by ZO = √L/C when L and C are known. When a section of transmission line contains 250 microhenries of L and 1000 picofarads of C, its impedance total (ZO) will be:

  • 50 ohms.
  • 250 ohms.
  • Correct Answer
    500 ohms.
  • 1,000 ohms.
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If long-length transmission lines are not properly shielded and terminated:

  • The silicon crystals can be damaged.
  • Correct Answer
    Communications receiver interference might result.
  • Overmodulation might result.
  • Minimal RF loss can result.
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A certain length of transmission line has a characteristic impedance of 72 ohms. If the line is cut at its center, each half of the transmission line will have a ZO of:

  • 36 ohms.
  • 144 ohms.
  • Correct Answer
    72 ohms.
  • The exact length must be known to determine Zo.
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Standing waves on a transmission line may be an indication that:

  • All energy is being delivered to the load.
  • Source and surge impedances are equal to ZO and ZL.
  • The line is terminated in impedance equal to ZO.
  • Correct Answer
    Some of the energy is not absorbed by the load.
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What precautions should be taken with horizontal waveguide runs?

  • Correct Answer
    They should be sloped slightly downwards at the elbow and a small drain hole drilled in the elbow.
  • They should be absolutely level.
  • They should not exceed 10 feet in length.
  • None of the above.
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