Technician License Course Chapter 3 Operating Station Equipment

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Technician License CourseChapter 3Operating
Station Equipment

• Practical Antennas

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The Dipole

• Most basic antenna
• Two conductive, equal length parts
• Feed line connected in the middle
• Total length is ½ wavelength (1/2 l )
• Length (in feet) 468 / Frequency (in MHz)

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The Dipole
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The Ground-plane

• Simply a dipole that is oriented perpendicular
  (vertical to the earths surface)
• One half of the dipole is replaced by the
  ground-plane
• Earth
• Car roof or trunk lid - or other metal surface
• Radial wires
• Length (in feet) 234 / Frequency (in MHz)

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The Ground-plane
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Loop Antennas Dipole Variations

• Quad
• Delta
• Horizontal

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Directional Beam Antennas

• Beam antennas focus or direct RF energy in a
  desired direction
• Gain
• An apparent increase in power in the desired
  direction (both transmit and receive)
• Yagi (rod like elements TV antennas)
• Quad (square wire loop elements)

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Directional Beam Antennas
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Directional Beam Antennas

• All beam antennas have parts called elements
• Driven element connected to the radio by the feed
  line
• Reflector element is on the back side
• Director element is on the front side toward the
  desired direction

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Coax Feed lines

• RG-58
• RG-8
• RG-213
• RG-174
• Hardline

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Coax Connectors

• SO-239/PL259
• BNC
• N
• SMA

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Feed Line Devices

• Balun
• Duplexer
• Antenna Switches
• SWR Meter
• Antenna Analyzer
• Antenna tuners

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Antenna Supports

• Trees
• Towers or masts
• Covenants and antenna restrictions must be
  considered.

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Review Test Questions

• T9A01, 02, 06, 08 through 12
• T9C07, 09, 10

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Next Time

• Power Supplies and Batteries
• Handheld Transceivers
• RF Interference
• Read 3-24 through 3-33