Extra Class License Exam Questions

Subelement E3

Radio Wave Propagation

Question Display Options:
Group E3A Electromagnetic waves; Earth-Moon-Earth communications; meteor scatter; microwave tropospheric and scatter propagation; aurora propagation
E3A01 What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?
E3A02 What characterizes libration fading of an EME signal?
E3A03 When scheduling EME contacts, which of these conditions will generally result in the least path loss?
E3A04 What do Hepburn maps predict?
E3A05 Tropospheric propagation of microwave signals often occurs along what weather related structure?
E3A06 Which of the following is required for microwave propagation via rain scatter?
E3A07 Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?
E3A08 When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
E3A09 Which of the following frequency range is most suited for meteor scatter communications?
E3A10 Which type of atmospheric structure can create a path for microwave propagation?
E3A11 What is a typical range for tropospheric propagation of microwave signals?
E3A12 What is the cause of auroral activity?
E3A13 Which emission mode is best for aurora propagation?
E3A14 From the contiguous 48 states, in which approximate direction should an antenna be pointed to take maximum advantage of aurora propagation?
E3A15 What is an electromagnetic wave?
E3A16 Which of the following best describes electromagnetic waves traveling in free space?
E3A17 What is meant by circularly polarized electromagnetic waves?
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Group E3B Transequatorial propagation; long path; gray-line; multi-path; ordinary and extraordinary waves; chordal hop, sporadic E mechanisms
E3B01 What is transequatorial propagation?
E3B02 What is the approximate maximum range for signals using transequatorial propagation?
E3B03 What is the best time of day for transequatorial propagation?
E3B04 What is meant by the terms extraordinary and ordinary waves?
E3B05 Which amateur bands typically support long-path propagation?
E3B06 Which of the following amateur bands most frequently provides long-path propagation?
E3B07 Which of the following could account for hearing an echo on the received signal of a distant station?
E3B08 What type of HF propagation is probably occurring if radio signals travel along the terminator between daylight and darkness?
E3B09 At what time of year is Sporadic E propagation most likely to occur?
E3B10 What is the cause of gray-line propagation?
E3B11 At what time of day is Sporadic-E propagation most likely to occur?
E3B12 What is the primary characteristic of chordal hop propagation?
E3B13 Why is chordal hop propagation desirable?
E3B14 What happens to linearly polarized radio waves that split into ordinary and extraordinary waves in the ionosphere?
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Group E3C Radio-path horizon; less common propagation modes; propagation prediction techniques and modeling; space weather parameters and amateur radio
E3C01 What does the term ray tracing describe in regard to radio communications?
E3C02 What is indicated by a rising A or K index?
E3C03 Which of the following signal paths is most likely to experience high levels of absorption when the A index or K index is elevated?
E3C04 What does the value of Bz (B sub Z) represent?
E3C05 What orientation of Bz (B sub z) increases the likelihood that incoming particles from the Sun will cause disturbed conditions?
E3C06 By how much does the VHF/UHF radio horizon distance exceed the geometric horizon?
E3C07 Which of the following descriptors indicates the greatest solar flare intensity?
E3C08 What does the space weather term G5 mean?
E3C09 How does the intensity of an X3 flare compare to that of an X2 flare?
E3C10 What does the 304A solar parameter measure?
E3C11 What does VOACAP software model?
E3C12 How does the maximum distance of ground-wave propagation change when the signal frequency is increased?
E3C13 What type of polarization is best for ground-wave propagation?
E3C14 Why does the radio-path horizon distance exceed the geometric horizon?
E3C15 What might a sudden rise in radio background noise indicate?
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