1. Which of the following acronym definitions is not correct?
2. What is the critical frequency? (all answers refer to the ionosphere above a particular location)
3. What is an ionosonde (Hint: it is used to measure critical frequency)?
4. What is a skip zone?
5. What determines the value of the Lowest Usable Frequency (LUF)?
Question 1: The correct answer is e) None of the acronym definitions are correct. .
Question 2: The correct answer is a) The critical frequency is the maximum plasma frequency.
Question 3: The correct answer is e) An ionosonde is a vertically tranmitting radio that times the travel time of the signal as a function of frequency.
Question 4: The correct answer c)A skip zone is a region where there is no HF reception, but with reception at closer and farther distances to the transmitter.
Question 5: The correct answer is d) The Lowest Usable Frequency (LUF) is determined by receiver sensitivity, transmission power, and absorption in the D-layer.
You answered them all right!