Podcast
Questions and Answers
What happens to the electric field component of a circular polarized wave as it propagates?
What happens to the electric field component of a circular polarized wave as it propagates?
- It reverses its direction
- It oscillates in a random direction
- It remains fixed in one direction
- It rotates 360 degrees with respect to the direction of propagation (correct)
What is the main reason for the attenuation of electromagnetic waves in free space?
What is the main reason for the attenuation of electromagnetic waves in free space?
- The spreading of waves with distance from the transmitter (correct)
- The reflection of waves by the ionosphere
- The presence of obstacles in the path
- The absorption of energy by the atmosphere
What is the purpose of a diplexer in a radio transmission system?
What is the purpose of a diplexer in a radio transmission system?
- To filter out noise
- To amplify the signal
- To measure the field intensity
- To permit two transmitters to operate with a single antenna (correct)
What happens to the power density of electromagnetic waves as they travel outward from their source?
What happens to the power density of electromagnetic waves as they travel outward from their source?
What is the term for the highest frequency that will be returned by the ionosphere at a given point?
What is the term for the highest frequency that will be returned by the ionosphere at a given point?
What is the definition of free space in terms of radio wave propagation?
What is the definition of free space in terms of radio wave propagation?
What is the term for the deviation of a wave as it passes an obstacle or passes through a small aperture?
What is the term for the deviation of a wave as it passes an obstacle or passes through a small aperture?
What is the unit of frequency above which microwave frequencies are defined?
What is the unit of frequency above which microwave frequencies are defined?
What is the main purpose of using circular polarization in satellite wave propagation?
What is the main purpose of using circular polarization in satellite wave propagation?
What type of polarization has the electric field in the vertical direction with respect to the earth horizon?
What type of polarization has the electric field in the vertical direction with respect to the earth horizon?
What is the relationship between the angle of incidence and the angle of refraction in reflection?
What is the relationship between the angle of incidence and the angle of refraction in reflection?
What is the phenomenon where a wave passes from one medium to another with different index of refraction?
What is the phenomenon where a wave passes from one medium to another with different index of refraction?
What law relates the angles of incidence and refraction in refraction?
What law relates the angles of incidence and refraction in refraction?
What is the phenomenon where the angle of refraction is greater than 90°, resulting in the wave coming out of the second medium and back into the first?
What is the phenomenon where the angle of refraction is greater than 90°, resulting in the wave coming out of the second medium and back into the first?
What is the relationship between the dielectric constant and the angle of refraction in refraction?
What is the relationship between the dielectric constant and the angle of refraction in refraction?
What is the type of polarization where the electric field rotates in a circular motion?
What is the type of polarization where the electric field rotates in a circular motion?
What type of wave propagation occurs at frequencies below 3 MHz?
What type of wave propagation occurs at frequencies below 3 MHz?
At what frequency do the D and E layers absorb frequencies during the day?
At what frequency do the D and E layers absorb frequencies during the day?
What occurs when a wave is sent vertically toward the ionosphere?
What occurs when a wave is sent vertically toward the ionosphere?
What determines the electric field strength?
What determines the electric field strength?
What is the critical frequency an indication of?
What is the critical frequency an indication of?
What is the distance from the ground to the F2 layer?
What is the distance from the ground to the F2 layer?
What are the three factors that affect the ability of the ionosphere to reflect a signal?
What are the three factors that affect the ability of the ionosphere to reflect a signal?
What type of wave propagation occurs at frequencies above 30 MHz?
What type of wave propagation occurs at frequencies above 30 MHz?
