G3B01:

What is a characteristic of skywave signals arriving at your location by both short-path and long-path propagation?

  1. Periodic fading approximately every 10 seconds
  2. Signal strength increased by 3 dB
  3. The signal might be cancelled causing severe attenuation
  4. A slightly delayed echo might be heard

G3B02:

What factors affect the MUF?

  1. Path distance and location
  2. Time of day and season
  3. Solar radiation and ionospheric disturbances
  4. All these choices are correct

G3B03:

Which of the following applies when selecting a frequency for lowest attenuation when transmitting on HF?

  1. Select a frequency just below the MUF
  2. Select a frequency just above the LUF
  3. Select a frequency just below the critical frequency
  4. Select a frequency just above the critical frequency

G3B04:

What is a reliable way to determine if the MUF is high enough to support skip propagation between your station and a distant location on frequencies between 14 and 30 MHz?

  1. Listen for signals from an international beacon in the frequency range you plan to use
  2. Send a series of dots on the band and listen for echoes from your signal
  3. Check the strength of TV signals from western Europe
  4. Check the strength of signals in the MF AM broadcast band

G3B05:

What usually happens to radio waves with frequencies below the MUF and above the LUF when they are sent into the ionosphere?

  1. They are bent back to Earth
  2. They pass through the ionosphere
  3. They are amplified by interaction with the ionosphere
  4. They are bent and trapped in the ionosphere to circle Earth

G3B06:

What usually happens to radio waves with frequencies below the LUF?

  1. They are bent back to Earth
  2. They pass through the ionosphere
  3. They are completely absorbed by the ionosphere
  4. They are bent and trapped in the ionosphere to circle Earth

G3B07:

What does LUF stand for?

  1. The Lowest Usable Frequency for communications between two points
  2. The Longest Universal Function for communications between two points
  3. The Lowest Usable Frequency during a 24-hour period
  4. The Longest Universal Function during a 24-hour period

G3B08:

What does MUF stand for?

  1. The Minimum Usable Frequency for communications between two points
  2. The Maximum Usable Frequency for communications between two points
  3. The Minimum Usable Frequency during a 24-hour period
  4. The Maximum Usable Frequency during a 24-hour period

G3B09:

What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?

  1. 180 miles
  2. 1,200 miles
  3. 2,500 miles
  4. 12,000 miles

G3B10:

What is the approximate maximum distance along the Earth's surface that is normally covered in one hop using the E region?

  1. 180 miles
  2. 1,200 miles
  3. 2,500 miles
  4. 12,000 miles

G3B11:

What happens to HF propagation when the LUF exceeds the MUF?

  1. No HF radio frequency will support ordinary skywave communications over the path
  2. HF communications over the path are enhanced
  3. Double hop propagation along the path is more common
  4. Propagation over the path on all HF frequencies is enhanced