__________________________________________________________ Radio Wave Propagation
Check-on-Learning Questions
Radio Wave Propagation
1. Which two composite fields (composed of E and H fields) are associated with every antenna?
2. What composite field (composed of E and H fields) is found stored in the antenna?
3. What composite field (composed of E and H fields) is propagated into free space?
4. What is the term used to describe the basic frequency of a radio wave?
5. What is the term used to describe a whole number multiple of the basic frequency of a radio
wave?
6. It is known that WWV operates on a frequency of 10 megahertz. What is the wavelength of
WWV?
7. A station is known to operate at 60 meters. What is the frequency of the unknown station?
8. If a transmitting antenna is placed close to the ground, how should the antenna be polarized
to give the greatest signal strength?
9. In the right-hand rule for propagation, the thumb points in the direction of the E field and
the forefinger points in the direction of the H field. In what direction does the middle finger
point?
10. What is one of the major reasons for the fading of radio waves that have been reflected from
a surface?
11. What are the three layers of the atmosphere?
12. Which layer of the atmosphere has relatively little effect on radio waves?
13. What is the determining factor in classifying whether a radio wave is a ground wave or a
space wave?
14. What is the best type of surface or terrain to use for radio wave transmission?
15. What is the primary difference between the radio horizon and the natural horizon?
16. What three factors must be considered in the transmission of a surface wave to reduce
17. What causes ionization to occur in the ionosphere?
18. How are the four distinct layers of the ionosphere designated?
19. What is the height of the individual layers of the ionosphere?
20. What factor determines whether a radio wave is reflected or refracted by the ionosphere?
21. There is a maximum frequency at which vertically transmitted radio waves can be refracted
back to Earth. What is this maximum frequency called?
22. What three main factors determine the amount of refraction in the ionosphere?
23. What is the skip zone of a radio wave?
24. Where does the greatest amount of ionospheric absorption occur in the ionosphere?
25. What is meant by the term "multipath"?
26. When a wide band of frequencies is transmitted simultaneously, each frequency will vary in
the amount of fading. What is this variable fading called?
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