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NEW Extra Class Exam Question Pool

effective 7/01/2012 thru 6/30/2016

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E3A-2012: Propagation and technique, Earth-Moon-Earth communications; meteor scatter

E3A01-2012: 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



E3A02-2012: 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



E3A03-2012: 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



E3A04-2012: 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



E3A05-2012: 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



E3A06-2012: 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



E3A07-2012: 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



E3A08-2012: 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



E3A09-2012: 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



E3A10-2012: 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





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