G3B: Maximum Usable Frequency; Lowest Usable Frequency; propagation "hops"
G3B01:
Which band should offer the best chance for a successful contact if the maximum usable frequency (MUF) between the two stations is 22 MHz?
15 meters
10 meters
20 meters
40 meters
G3B02:
Which band should offer the best chance for a successful contact if the maximum usable frequency (MUF) between the two stations is 16 MHz?
20 meters
80 meters
40 meters
2 meters
G3B03:
Which of the following guidelines should be selected for lowest attenuation when transmitting on HF?
Select a frequency just below the MUF
Select a frequency just above the LUF
Select a frequency just below the critical frequency
Select a frequency just above the critical frequency
G3B04:
What is a reliable way to determine if the maximum usable frequency (MUF) is high enough to support 28-MHz propagation between your station and Western Europe?
Listen for signals on a 28 MHz international beacon
Send a series of dots on the 28 MHz band and listen for echoes from your signal
Check the strength of TV signals from Western Europe
Listen to WWV propagation signals on the 28 MHz band
G3B05:
What usually happens to radio waves with frequencies below the maximum usable frequency (MUF) when they are sent into the ionosphere?
They are bent back to the Earth
They pass through the ionosphere
They are completely absorbed by the ionosphere
They are bent and trapped in the ionosphere to circle the Earth
G3B06:
What usually happens to radio waves with frequencies below the lowest usable frequency (LUF)?
They are completely absorbed by the ionosphere
They are bent back to the Earth
They pass through the ionosphere
They are bent and trapped in the ionosphere to circle the Earth
G3B07:
What does LUF stand for?
The Lowest Usable Frequency for communications between two points
The Longest Universal Function for communications between two points
The Lowest Usable Frequency during a 24 hour period
The Longest Universal Function during a 24 hour period
G3B08:
What does MUF stand for?
The Maximum Usable Frequency for communications between two points
The Minimum Usable Frequency for communications between two points
The Minimum Usable Frequency during a 24 hour period
The Maximum Usable Frequency during a 24 hour period
G3B09:
What is the maximum distance along the Earth's surface that is normally covered in one hop using the F2 region?
2,500 miles
180 miles
1,200 miles
12,000 miles
G3B10:
What is the maximum distance along the Earth's surface that is normally covered in one hop using the E region?
1,200 miles
180 miles
2,500 miles
12,000 miles
G3B11:
What happens to HF propagation when the lowest usable frequency (LUF) exceeds the maximum usable frequency (MUF)?
No HF radio frequency will support communications over the path
HF communications over the path are enhanced at the frequency where the LUF and MUF are the same
Double hop propagation along the path is more common
Propagation over the path on all HF frequencies is enhanced
G3B12:
What factors affect the maximum usable frequency (MUF)?
All of these choices are correct
Path distance and location
Time of day and season
Solar radiation and ionospheric disturbance
G3B13:
How might a sky-wave signal sound if it arrives at your receiver by both short path and long path propagation?
A well-defined echo can be heard
Periodic fading approximately every 10 seconds
Signal strength increased by 3 dB
The signal will be cancelled causing severe attenuation
G3B14:
Which of the following is a good indicator of the possibility of sky-wave propagation on the 6 meter band?
Short hop sky-wave propagation on the 10 meter band
Long hop sky-wave propagation on the 10 meter band
Severe attenuation of signals on the 10 meter band
Long delayed echoes on the 10 meter band
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● = Incorrect answer
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