23 Questions
What is the term used to describe the bending of the radio wave path?
Refraction
Which propagation type follows the contour of the earth and can propagate at frequencies up to 2 MHz?
Ground-wave propagation
What type of communication requires antennas to be within effective line of sight due to refraction?
Ground-wave communication
In which type of propagation does the signal travel back and forth between the ionosphere and the earth's surface?
Sky-wave propagation
What is the term for the modulation or retribution of energy within a wavefront when it passes near the edge of an opaque object?
Diffraction
Which type of waves require antennas to be in direct line of sight between transmit and receive antennas?
Space wave
What are Electromagnetic Waves defined as?
Superimposed oscillations of an Electric and a Magnetic Field
In which direction do Electromagnetic Waves propagate?
Perpendicular to the Electric Field
What type of medium do Electromagnetic Waves require for propagation?
They do not require any medium
What is the relationship between wavelength and frequency of Electromagnetic Waves?
Directly proportional
What property allows Electromagnetic Waves to travel in a transverse form?
Wave polarization
Which property of Electromagnetic Waves allows them to undergo interference and diffraction?
Constant polarization
What does MUF stand for in the context of sky wave propagation?
Maximum Usable Frequency
What is the significance of working at 85% of the MUF?
Provides more reliable communications
What is the Skip distance in the context of sky wave propagation?
Minimum distance from a transmit antenna for wave return
What is the Free-space path loss concept related to?
Loss of energy in vacuum as waves propagate
What is the role of Fade Margin in sky wave propagation?
Mitigate the impact of temporary fading
What is the characteristic of elliptical polarization?
Field strength varies with changes in polarization
What is the function of a wavefront?
To join points of equal phase on rays propagated from the same source
What is the unit of power density?
W/m2
What is the characteristic impedance of free space equal to?
The square root of its magnetic permeability to its electric permittivity
What is the definition of a ray?
A line drawn along the direction of propagation of an electromagnetic wave
What type of polarization is characterized by a rotating polarization vector?
Circular polarization
Test your knowledge on terms related to radio wave propagation such as Maximum Usable Frequency (MUF), Optimum Working Frequency (OWF), Skip distance, and Free-space path loss. Learn about how these concepts influence communication for sky wave propagation.
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