SUBELEMENT E3 -- RADIO WAVE PROPAGATION [3 Exam Questions -- 3 Groups]
E3A Earth-Moon-Earth (EME or
moonbounce) communications; meteor
scatter
E3A01
(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
E3A02
(B)
What
characterizes libration fading of an earth-moon-earth 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
E3A03
(A)
What
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
E3A04
(D)
What
type of receiving system is required for EME communications?
A. Equipment with very low power output
B. Equipment with very low dynamic range
C. Equipment with very low gain
D. Equipment with very low
noise figures
E3A05
(A)
What
transmit and receive time sequencing is normally used on 144 MHz when
attempting an earth-moon-earth contact?
A. Two-minute sequences,
where one station transmits for a full two minutes and then receives for the
following two minutes
B. One-minute sequences, where one station
transmits for one minute and then receives for the following one minute
C. Two-and-one-half minute sequences, where one
station transmits for a full 2.5 minutes and then receives for the following
2.5 minutes
D. Five-minute sequences, where one station
transmits for five minutes and then receives for the following five minutes
E3A06
(C)
What
transmit and receive time sequencing is normally used on 432 MHz when
attempting an EME contact?
A. Two-minute sequences, where one station
transmits for a full two minutes and then receives for the following two
minutes
B. One-minute sequences, where one station
transmits for one minute and then receives for the following one minute
C. Two and one half minute
sequences, where one station transmits for a full 2.5 minutes and then receives
for the following 2.5 minutes
D. Five minute sequences, where one station
transmits for five minutes and then receives for the following five minutes
E3A07
(B)
What
frequency range would you normally tune to find EME stations in the 2-meter band?
A. 144.000 - 144.001 MHz
B. 144.000 - 144.100 MHz
C. 144.100 - 144.300 MHz
D. 145.000 - 145.100 MHz
E3A08
(D)
What
frequency range would you normally tune to find EME stations in the 70-cm band?
A. 430.000 - 430.150 MHz
B. 430.100 - 431.100 MHz
C. 431.100 - 431.200 MHz
D. 432.000 - 432.100 MHz
E3A09
(A)
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 E layer
B. The F1 layer
C. The F2 layer
D. The D layer
E3A10
(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
E3A11
(C)
What
transmit and receive time sequencing is normally used on 144 MHz when
attempting a meteor-scatter contact?
A. Two-minute sequences, where one station
transmits for a full two minutes and then receives for the following two
minutes
B. One-minute sequences, where one station
transmits for one minute and then receives for the following one minute
C. 15-second sequences,
where one station transmits for 15 seconds and then receives for the following
15 seconds
D. 30-second sequences, where one station
transmits for 30 seconds and then receives for the following 30 seconds