B-006
Subelement B-006
Section B-006-007
Section B-006-007
What does horizontal wave polarization mean?
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The electric lines of force of a radio wave are perpendicular to the Earth's surface
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The electric and magnetic lines of force of a radio wave are perpendicular to the Earth's surface
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The magnetic lines of force of a radio wave are parallel to the Earth's surface
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Correct AnswerThe electric lines of force of a radio wave are parallel to the Earth's surface
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What does vertical wave polarization mean?
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The electric and magnetic lines of force of a radio wave are parallel to the Earth's surface
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Correct AnswerThe electric lines of force of a radio wave are perpendicular to the Earth's surface
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The magnetic lines of force of a radio wave are perpendicular to the Earth's surface
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The electric lines of force of a radio wave are parallel to the Earth's surface
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What electromagnetic wave polarization does a Yagi antenna have when its elements are parallel to the Earth's surface?
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Vertical
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Circular
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Correct AnswerHorizontal
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Elliptical
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What electromagnetic wave polarization does a half-wavelength antenna have when it is perpendicular to the Earth's surface?
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Elliptical
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Horizontal
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Correct AnswerVertical
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Circular
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
Polarization of an antenna is determined by:
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Correct Answerthe orientation of the electric field relative to the Earth's surface
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the orientation of the electric field relative to the transmission line
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the orientation of the electric field relative to the magnetic field
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the orientation of the magnetic field relative to the Earth's surface
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
An isotropic antenna is:
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Correct Answera hypothetical point source
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a dummy load
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an infinitely long piece of wire
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a half-wave reference dipole
'Isotropic' means "equal radiation in all directions". An 'isotropic antenna', also called 'isotropic radiator'. is a HYPOTHETICAL point source. Plotting the pattern in all planes around the source would yield a 'sphere' as a pattern. The 'isotropic antenna' is used as a reference to compare the gain of real antennas.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
What is the three-dimensional radiation pattern of an isotropic radiator?
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A torus (donut shape)
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Correct AnswerA sphere
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A hemisphere
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A cardioid
'Isotropic' means "equal radiation in all directions". An 'isotropic antenna', also called 'isotropic radiator'. is a HYPOTHETICAL point source. Plotting the pattern in all planes around the source would yield a 'sphere' as a pattern. The 'isotropic antenna' is used as a reference to compare the gain of real antennas.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
VHF signals from a mobile station using a vertical whip antenna will normally be best received using a:
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random length of wire
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Correct Answervertical ground-plane antenna
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horizontal ground-plane antenna
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horizontal dipole antenna
Key words: VHF, VERTICAL. On 'line of sight' propagation (common at Very High Frequencies) and with Ground Wave propagation (common at the low end of High Frequencies), a significant loss is incurred if the antennas on both extremities do NOT have the same polarization.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
A dipole antenna will emit a vertically polarized wave if it is:
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too near to the ground
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very high above ground
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Correct Answermounted vertically
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mounted horizontally
An electromagnetic wave comprises an electrical field and a magnetic field. Wave Polarization describes the position of the ELECTRIC field with respect to the Earth's surface. On a dipole antenna or on the 'driven' element of a Yagi, the electric field is developed between the tips of the radiating element.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
If an electromagnetic wave leaves an antenna vertically polarized and reaches the receiving location by ground wave, what will be its final polarization?
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Oblique
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Circular
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Horizontal
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Correct AnswerVertical
Key words: GROUND WAVE. On 'line of sight' propagation (common at Very High Frequencies) and with Ground Wave propagation (common at the low end of High Frequencies), a significant loss is incurred if the antennas on both extremities do NOT have the same polarization.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
Compared with a horizontal antenna, a vertical antenna will receive a vertically polarized radio wave:
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Correct Answerat higher strength
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at about the same strength
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at a strength depending on the height above ground
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at lower strength
On 'line of sight' propagation (common at Very High Frequencies) and with Ground Wave propagation (common at the low end of High Frequencies), a significant loss is incurred if the antennas on both extremities do NOT have the same polarization.
Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.
Tags: none
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