Extra · E3
RADIO WAVE PROPAGATION
Propagation at the level that explains, not just describes: ionospheric layers, ray paths, scatter modes, and the physics behind why a band opens or closes when it does.
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39 questions across 3 groups
Group E3A
- E3A01What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?
- E3A02What characterizes libration fading of an EME signal?
- E3A03When scheduling EME contacts, which of these conditions will generally result in the least path loss?
- E3A04In what direction does an electromagnetic wave travel?
- E3A05How are the component fields of an electromagnetic wave oriented?
- E3A06What should be done to continue a long-distance contact when the MUF for that path decreases due to darkness?
- E3A07Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?
- E3A08When a meteor strikes the Earth’s atmosphere, a linear ionized region is formed at what region of the ionosphere?
- E3A09Which of the following frequency ranges is most suited for meteor-scatter communications?
- E3A10What determines the speed of electromagnetic waves through a medium?
- E3A11What is a typical range for tropospheric duct propagation of microwave signals?
- E3A12What is most likely to result in auroral propagation?
- E3A13Which of these emission modes is best for auroral propagation?
- E3A14What are circularly polarized electromagnetic waves?
Group E3B
- E3B01Where is transequatorial propagation (TEP) most likely to occur?
- E3B02What is the approximate maximum range for signals using transequatorial propagation?
- E3B03At what time of day is transequatorial propagation most likely to occur?
- E3B04What are “extraordinary” and “ordinary” waves?
- E3B05Which of the following paths is most likely to support long-distance propagation on 160 meters?
- E3B06On which of the following amateur bands is long-path propagation most frequent?
- E3B07What effect does lowering a signal’s transmitted elevation angle have on ionospheric HF skip propagation?
- E3B08How does the maximum range of ground-wave propagation change when the signal frequency is increased?
- E3B09At what time of year is sporadic-E propagation most likely to occur?
- E3B10What is the effect of chordal-hop propagation?
- E3B11At what time of day is sporadic-E propagation most likely to occur?
- E3B12What is chordal-hop propagation?
- E3B13What type of polarization is supported by ground-wave propagation?
Group E3C
- E3C01What is the cause of short-term radio blackouts?
- E3C02What is indicated by a rising A-index or K-index?
- E3C03Which of the following signal paths is most likely to experience high levels of absorption when the A- index or K-index is elevated?
- E3C04What does the value of Bz (B sub z) represent?
- E3C05What orientation of Bz (B sub z) increases the likelihood that charged particles from the Sun will cause disturbed conditions?
- E3C06How does the VHF/UHF radio horizon compare to the geographic horizon?
- E3C07Which of the following indicates the greatest solar flare intensity?
- E3C08Which of the following is the space-weather term for an extreme geomagnetic storm?
- E3C09What type of data is reported by amateur radio propagation reporting networks?
- E3C10What does the 304A solar parameter measure?
- E3C11What does VOACAP software model?
- E3C12Which of the following is indicated by a sudden rise in radio background noise across a large portion of the HF spectrum?