24. In improvising a ground-plane antenna, it is important to separate the
three ground-plane elements by--
a.
45 degrees.
b.
90 degrees.
c.
120 degrees.
d.
180 degrees.
25. For best operation of the half-rhombic expedient antenna, each leg
should be a minimum of one wavelength long at the lowest operating
frequency. This is done by making each leg--
a.
25 feet long.
b.
50 feet long.
c.
80 feet long.
d.
100 feet long.
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ANSWERS:
16.
c.
17.
d.
18.
b.
19.
d.
20.
c.
21.
b.
22.
a.
23.
c.
24.
c.
25.
b.
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34. SUMMARY. This lesson has
concentrated on field-expedient antennas and
the methods used to improvise
antennas.
You have not learned enough to
consider yourself an expert in
the subject of antennas. However, you have
learned enough to enable you to
maintain or restore communication.
Before using field expedients, analyze your communication problem.
Remember, expedients will not overcome maintenance or operator problems.
Expedient antennas are easily fabricated from materials normally found on
the battlefield.
Field wire (WD-1/TT) can be used to manufacture most
antennas.
Antenna lengths are critical.
Remember the wavelength formula.
Always
compute the proper antenna length that will keep you communicating.
63
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