PRACTICE EXERCISES:
6. When power is delivered to an antenna, two electrical fields are set
up by this fluctuating energy.
These fields are the _______________
field and the _______________ field.
7. Only the ______________ field moves out into space.
This field is
composed of two components, the _____________ component and the
_____________ component.
8. These two components are arranged at ___________ angles to each other.
9. Radio waves radiated from an antenna create a ____________ wave
disturbance which travels outward from the antenna at a velocity of
_______________ meters per second.
10. A quarter-wave antenna is _________ mounted and radiates in _________.
11. A half-wave antenna is usually ________________ mounted and radiates
______________ to its length.
12. T
F
A quarter-wave antenna has maximum radiation off the top of
the antenna.
13. T
F
The quarter-wave antenna is an omnidirectional
antenna,
because it radiates radio waves in all directions.
14. T
F
The half-wave antenna radiates maximum radiation from the
ends of the antenna.
15. T
F
The term "continuous wave" describes a radio wave traveling
through
the
atmosphere
at
a
constant
velocity
and
amplitude.
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ANSWERS:
6.
induction, radiation
7.
radiation, electric, magnetic
8.
right
9.
continuous, 300,000,000
10.
vertically, all directions or omnidirectional.
11.
horizontally, at right angles (or broadside) to its length.
12.
F
13.
T
14.
F
15.
T
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NOTE TO STUDENT:
Before proceeding, it is best to review radio wave
propagation.
This paragraph will be brief--you may
wish to review TM 11-666.
10
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