Radio Wave Propagation Terms
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Questions and Answers

What is the term used to describe the bending of the radio wave path?

  • Refraction (correct)
  • Interference
  • Reflection
  • Diffraction
  • Which propagation type follows the contour of the earth and can propagate at frequencies up to 2 MHz?

  • Sky-wave propagation
  • Interference propagation
  • Reflection propagation
  • Ground-wave propagation (correct)
  • What type of communication requires antennas to be within effective line of sight due to refraction?

  • Ground-wave communication (correct)
  • Sky-wave communication
  • Reflection communication
  • Space-wave communication
  • In which type of propagation does the signal travel back and forth between the ionosphere and the earth's surface?

    <p>Sky-wave propagation</p> Signup and view all the answers

    What is the term for the modulation or retribution of energy within a wavefront when it passes near the edge of an opaque object?

    <p>Diffraction</p> Signup and view all the answers

    Which type of waves require antennas to be in direct line of sight between transmit and receive antennas?

    <p>Space wave</p> Signup and view all the answers

    What are Electromagnetic Waves defined as?

    <p>Superimposed oscillations of an Electric and a Magnetic Field</p> Signup and view all the answers

    In which direction do Electromagnetic Waves propagate?

    <p>Perpendicular to the Electric Field</p> Signup and view all the answers

    What type of medium do Electromagnetic Waves require for propagation?

    <p>They do not require any medium</p> Signup and view all the answers

    What is the relationship between wavelength and frequency of Electromagnetic Waves?

    <p>Directly proportional</p> Signup and view all the answers

    What property allows Electromagnetic Waves to travel in a transverse form?

    <p>Wave polarization</p> Signup and view all the answers

    Which property of Electromagnetic Waves allows them to undergo interference and diffraction?

    <p>Constant polarization</p> Signup and view all the answers

    What does MUF stand for in the context of sky wave propagation?

    <p>Maximum Usable Frequency</p> Signup and view all the answers

    What is the significance of working at 85% of the MUF?

    <p>Provides more reliable communications</p> Signup and view all the answers

    What is the Skip distance in the context of sky wave propagation?

    <p>Minimum distance from a transmit antenna for wave return</p> Signup and view all the answers

    What is the Free-space path loss concept related to?

    <p>Loss of energy in vacuum as waves propagate</p> Signup and view all the answers

    What is the role of Fade Margin in sky wave propagation?

    <p>Mitigate the impact of temporary fading</p> Signup and view all the answers

    What is the characteristic of elliptical polarization?

    <p>Field strength varies with changes in polarization</p> Signup and view all the answers

    What is the function of a wavefront?

    <p>To join points of equal phase on rays propagated from the same source</p> Signup and view all the answers

    What is the unit of power density?

    <p>W/m2</p> Signup and view all the answers

    What is the characteristic impedance of free space equal to?

    <p>The square root of its magnetic permeability to its electric permittivity</p> Signup and view all the answers

    What is the definition of a ray?

    <p>A line drawn along the direction of propagation of an electromagnetic wave</p> Signup and view all the answers

    What type of polarization is characterized by a rotating polarization vector?

    <p>Circular polarization</p> Signup and view all the answers

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