5.
The E layer of the ionosphere is useful for providing communications in ranges up to about how
many miles?
A.
150
B.
1,500
C.
5,000
D.
7,500
6.
The frequency of the wave, the angle of incidence, and what else determine the size of the skip
distance?
A.
The type of modulation
B.
The height of the antenna
C.
The degree of ionization present
D.
The condition of the D layer
7.
Which layer of the ionosphere attenuates high frequencies that pass through it?
A.
D
B.
E
C.
F1
D.
F2
8.
SID may totally blank out long-distance propagation of all frequencies above how many MHz?
A.
1 MHz
B.
10 MHz
C.
50 MHz
D.
150 MHz
9.
What is the maximum frequency at which radio waves can be transmitted vertically and refracted
back to Earth?
A.
The refracted frequency
B.
The critical frequency
C.
The reflected frequency
D.
The diffracted frequency
3-13
SS0130
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