TC 9-64 _________________________________________________________________________
CHAPTER 4: ANTENNAS
1. Half-wave (Hertz) and quarter-wave (Marconi).
2. Coupling device, feeder, and antenna.
3. Frequency of operation of the transmitter, amount of power to be radiated, and general
direction of the receiving set.
4. One-half the wavelength.
5. Current and voltage loops.
6. Current and voltage nodes.
7. Reciprocity of antennas.
8. Electric (E) field.
9. Circular polarization.
10. Vertical polarization.
11. Less interference is experienced by man-made noise sources.
12. Vertical polarization.
13. 73 ohms.
14. Anisotropic radiator.
15. Isotropic radiator.
16. Anisotropic radiator.
17. Dipole, doublet and Hertz.
18. Nondirectional.
19. Vertical plane.
20. The pattern would flatten.
21. To connect one end through a capacitor to the final output stage of the transmitter.
22 .A circular radiation pattern in the horizontal plane, or same as a half wave.
23. It is composed of a series of conductors arranged in a radial pattern and buried 1 to 2 feet
below the ground.
24. Nine times the feed-point impedance.
25. Folded dipole.
26. To produce desired phase relationship between connected elements.
27. Major lobes have the greatest amount of radiation.
28. Four.
29. As more elements are added, an unbalanced condition in the system occurs which impairs
efficiency.
30. By increasing the lengths of the elements of the array.
31. Directivity increases.
A-6
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