HF Propagation

Question 1

Which part of the atmosphere enables the propagation of radio signals around the world? (T3A11)

Answer 1

The ionosphere

Question 2

Which of the following is an advantage of HF vs VHF and higher frequencies? (T3C02)

Answer 2

Long distance ionospheric propagation is far more common on HF

Question 3

Which of the following bands may provide long distance communications during the peak of the sunspot cycle? (T3C10)

Answer 3

6 or 10 meter bands

Question 4

What is generally the best time for long-distance 10 meter band propagation via the F layer? (T3C09)

Answer 4

From dawn to shortly after sunset during periods of high sunspot activity

Question 5

Which of the following is a likely cause of irregular fading of signals received by ionospheric reflection? (T3A08)

Answer 5

Random combining of signals arriving via different paths

Question 6

Which of the following results from the fact that skip signals refracted from the ionosphere are elliptically polarized? (T3A09)

Answer 6

Either vertically or horizontally polarized antennas may be used for transmission or reception