E3A: Earth-Moon-Earth communications; meteor scatter
E3A01:
What is the approximate maximum separation along the surface of the Earth between two stations communicating by moonbounce?
12,000 miles, as long as both can “see” the moon
500 miles if the moon is at perigee
2000 miles, if the moon is at apogee
5000 miles, if the moon is at perigee
E3A02:
What characterizes libration fading of an earth-moon-earth signal?
A fluttery irregular fading
A slow change in the pitch of the CW signal
A gradual loss of signal as the sun rises
The returning echo is several Hertz lower in frequency than the transmitted signal
E3A03:
When scheduling EME contacts, which of these conditions will generally result in the least path loss?
When the moon is at perigee
When the moon is full
When the moon is at apogee
When the MUF is above 30 MHz
E3A04:
What type of receiving system is desirable for EME communications?
Equipment with very low noise figures
Equipment with very wide bandwidth
Equipment with very low dynamic range
Equipment with very low gain
E3A05:
What transmit and receive time sequencing is normally used on 144 MHz when attempting an EME contact?
Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes
One-minute sequences, where one station transmits for one minute and then receives for the following one minute
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
Five-minute sequences, where one station transmits for five minutes and then receives for the following five minutes
E3A06:
What transmit and receive time sequencing is normally used on 432 MHz when attempting an EME contact?
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
Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes
One-minute sequences, where one station transmits for one minute and then receives for the following one minute
Five-minute sequences, where one station transmits for five minutes and then receives for the following five minutes
E3A07:
What frequency range would you normally tune to find EME stations in the 2 meter band?
144.000 - 144.100 MHz
144.000 - 144.001 MHz
144.100 - 144.300 MHz
145.000 - 145.100 MHz
E3A08:
What frequency range would you normally tune to find EME stations in the 70 cm band?
432.000 - 432.100 MHz
430.000 - 430.150 MHz
430.100 - 431.100 MHz
431.100 - 431.200 MHz
E3A09:
When a meteor strikes the Earth's atmosphere, a cylindrical region of free electrons is formed at what layer of the ionosphere?
The E layer
The F1 layer
The F2 layer
The D layer
E3A10:
Which range of frequencies is well suited for meteor-scatter communications?
28 - 148 MHz
1.8 - 1.9 MHz
10 - 14 MHz
220 - 450 MHz
E3A11:
What transmit and receive time sequencing is normally used on 144 MHz when attempting a meteor-scatter contact?
15-second sequences, where one station transmits for 15 seconds and then receives for the following 15 seconds
Two-minute sequences, where one station transmits for a full two minutes and then receives for the following two minutes
One-minute sequences, where one station transmits for one minute and then receives for the following one minute
30-second sequences, where one station transmits for 30 seconds and then receives for the following 30 seconds
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● = Unseen
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● = Weak
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● = Review
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● = Learned
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● = Incorrect answer
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