What is the approximate maximum separation measured along the surface of the Earth between two stations communicating by EME?

1. A 2,000 miles, if the moon is at perigee
2. B 2,000 miles, if the moon is at apogee
3. C 5,000 miles, if the moon is at perigee
4. D 12,000 miles, if the moon is "visible" by both stations

What characterizes libration fading of an EME signal?

1. A A slow change in the pitch of the CW signal
2. B A fluttery, irregular fading
3. C A gradual loss of signal as the sun rises
4. D 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?

1. A When the Moon is at perigee
2. B When the Moon is full
3. C When the Moon is at apogee
4. D When the MUF is above 30 MHz

In what direction does an electromagnetic wave travel?

1. A It depends on the phase angle of the magnetic field
2. B It travels parallel to the electric and magnetic fields
3. C It depends on the phase angle of the electric field
4. D It travels at a right angle to the electric and magnetic fields

How are the component fields of an electromagnetic wave oriented?

1. A They are parallel
2. B They are tangential
3. C They are at right angles
4. D They are 90 degrees out of phase

What should be done to continue a long-distance contact when the MUF for that path decreases due to darkness?

1. A Switch to a higher frequency HF band
2. B Switch to a lower frequency HF band
3. C Change to an antenna with a higher takeoff angle
4. D Change to an antenna with greater beam width

Atmospheric ducts capable of propagating microwave signals often form over what geographic feature?

1. A Mountain ranges
2. B Stratocumulus clouds
3. C Large bodies of water
4. D Nimbus clouds

When a meteor strikes the Earth's atmosphere, a linear ionized region is formed at what region of the ionosphere?

1. A The E region
2. B The F1 region
3. C The F2 region
4. D The D region

Which of the following frequency ranges is most suited for meteor-scatter communications?

1. A 1.8 MHz - 1.9 MHz
2. B 10 MHz - 14 MHz
3. C 28 MHz - 148 MHz
4. D 220 MHz - 450 MHz

What determines the speed of electromagnetic waves through a medium?

1. A Resistance and reactance
2. B Evanescence
3. C Birefringence
4. D The index of refraction

What is a typical range for tropospheric duct propagation of microwave signals?

1. A 10 miles to 50 miles
2. B 100 miles to 300 miles
3. C 1,200 miles
4. D 2,500 miles

What is most likely to result in auroral propagation?

1. A Meteor showers
2. B Quiet geomagnetic conditions
3. C Severe geomagnetic storms
4. D Extreme low-pressure areas in polar regions

Which of these emission modes is best for auroral propagation?

1. A CW
2. B SSB
3. C FM
4. D RTTY

What are circularly polarized electromagnetic waves?

1. A Waves with an electric field bent into a circular shape
2. B Waves with rotating electric and magnetic fields
3. C Waves that circle Earth
4. D Waves produced by a loop antenna