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ELE4BC
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1992-01-26
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FCC EXTRA Exam Question Pool. Subelement 4BC.
Radio Wave Propagation. 2 Questions.
---------------------------------------------------
4BC 1.1 D
What is the maximum separation between two stations communicating
by moonbounce?
A. 500 miles maximum, if the moon is at perigee
B. 2000 miles maximum, if the moon is at apogee
C. 5000 miles maximum, if the moon is at perigee
D. Any distance as long as the stations have a mutual lunar window
4BC 1.2 B
What characterizes libration fading of an EME signal?
A. A slow change in the pitch of the CW signal
B. A fluttery, rapid irregular fading
C. A gradual loss of signal as the sun rises
D. The returning echo is several hertz lower in frequency
than the transmitted signal
4BC 1.3 A
When are the best days to schedule EME contacts?
A. When the moon is at perigee
B. When the moon is full
C. When the moon is at apogee
D. When the weather at both stations is clear
4BC 1.4 D
What type of receiving system is required for EME
communications?
A. Equipment capable of reception on 14 MHz
B. Equipment with very low dynamic range
C. Equipment with very low gain
D. Equipment with very low noise figures
4BC 1.5 B
What type of transmitting system is required for EME
communications?
A. A transmitting system capable of operation on
the 21 MHz band
B. A transmitting system capable of producing very
high ERP
C. A transmitting system using an unmodulated carrier
D. A transmitting system with a high second harmonic
output
4BC 2.1 B
When the earth's atmosphere is struck by a meteor,
a cylindrical region of free electrons is formed at what layer
of the ionosphere?
A. The F1 layer
B. The E layer
C. The F2 layer
D. The D layer
4BC 2.2 C
Which range of frequencies is well suited for meteor-scatter
communications?
A. 1.8 - 1.9 MHz
B. 10 - 14 MHz
C. 28 - 148 MHz
D. 220 - 450 MHz
4BC 3.1 A
What is transequatorial propagation?
A. Propagation between two points at approximately the
same distance north and south of the magnetic equator
B. Propagation between two points on the magnetic equator
C. Propagation between two continents by way of ducts along
the magnetic equator
D. Propagation between any two stations at the same latitude
4BC 3.2 C
What is the maximum range for signals using transequatorial
propagation?
A. About 1,000 miles
B. About 2,500 miles
C. About 5,000 miles
D. About 7,500 miles
4BC 3.3 C
What is the best time of day for transequatorial propagation?
A. Morning
B. Noon
C. Afternoon or early evening
D. Transequatorial propagation only works at
night
4BC 4.1 C
If a beam antenna must be pointed in a direction 180 degrees
away from a station to receive the strongest signals, what
type of propagation is probably occurring?
A. Transequatorial propagation
B. Sporadic-E propagation
C. Long-path propagation
D. Auroral propagation
4BC 5.1 D
What is the name for a type of propagation in which radio
signals travel along the terminator, which separates daylight
from darkness?
A. Transequatorial propagation
B. Sporadic-E propagation
C. Long-path propagation
D. Gray-line propagation
--------------------------------------------------
End of Subelement 4BC.