E3A-2012: Propagation and technique, Earth-Moon-Earth communications; meteor scatter
What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by Moon bounce?
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
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
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
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
Which of the following describes a method of establishing EME contacts?
Time synchronous transmissions with each station alternating
Storing and forwarding digital messages
Judging optimum transmission times by monitoring beacons from the Moon
High speed CW identification to avoid fading
What frequency range would you normally tune to find EME signals 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
What frequency range would you normally tune to find EME signals 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
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
Which of the following frequency ranges is well suited for meteor-scatter communications?
28 - 148 MHz
1.8 - 1.9 MHz
10 - 14 MHz
220 - 450 MHz
Which of the following is a good technique for making meteor-scatter contacts?
All of these choices are correct
15 second timed transmission sequences with stations alternating based on location
Use of high speed CW or digital modes
Short transmission with rapidly repeated call signs and signal reports
● = Unseen
● = Weak
● = Review
● = Learned
● = Incorrect answer