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Subel. B-003
4 questions
Subelement B-003

B-003

Section B-003-009

Section B-003-009

Which component of a 3-element Yagi antenna is primarily for mechanical support?

  • Correct Answer
    The boom
  • The driven element
  • The director
  • The reflector

The 'boom' supports the elements of the Yagi.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

In a 3-element Yagi antenna, what is the longest radiating element?

  • The boom
  • The director
  • The driven element
  • Correct Answer
    The reflector

The 'boom' supports the elements of the Yagi. Element dimensions on a Yagi; the 'Driven' = a half-wave dipole, 95% of a half-wavelength in free space = (300 / MHz / 2) * 95%. The 'Reflector', in the back of the 'driven' = 5% longer than the 'driven'. The 'Director', in front of the 'driven, = 5% shorter than the 'driven'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

In a 3-element Yagi antenna, which is the shortest radiating element?

  • The reflector
  • The boom
  • Correct Answer
    The director
  • The driven element

The 'boom' supports the elements of the Yagi. Element dimensions on a Yagi; the 'Driven' = a half-wave dipole, 95% of a half-wavelength in free space = (300 / MHz / 2) * 95%. The 'Reflector', in the back of the 'driven' = 5% longer than the 'driven'. The 'Director', in front of the 'driven, = 5% shorter than the 'driven'.

Original copyright; explanations transcribed with permission from Francois VE2AAY, author of the ExHAMiner exam simulator. Do not copy without his permission.

Tags: none

In a 3-element Yagi antenna, which element is connected to the transmission line?

  • The boom
  • The reflector
  • Correct Answer
    The driven element
  • The director

The 'boom' supports the elements of the Yagi. Element dimensions on a Yagi; the 'Driven' = a half-wave dipole, 95% of a half-wavelength in free space = (300 / MHz / 2) * 95%. The 'Reflector' (in the back of the 'driven') = 5% longer than the 'driven'. The 'Director' (in front of the 'driven) = 5% shorter than the 'driven'.

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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