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Technician License Course Chapter 3 Operating Station Equipment

Technician License Course Chapter 3 Operating Station Equipment. Practical Antennas. 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). The Dipole.

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Technician License Course Chapter 3 Operating Station Equipment

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  1. Technician License CourseChapter 3Operating Station Equipment Practical Antennas

  2. 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)

  3. The Dipole

  4. The Ground-plane • Simply a dipole that is oriented perpendicular (vertical to the earth’s 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)

  5. The Ground-plane

  6. Loop Antennas – Dipole Variations • Quad • Delta • Horizontal

  7. 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)

  8. Directional BeamAntennas

  9. 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

  10. Coax Feed lines • RG-58 • RG-8 • RG-213 • RG-174 • Hardline

  11. SO-239/PL259 BNC N SMA Coax Connectors

  12. Feed Line Devices • Balun • Duplexer • Antenna Switches • SWR Meter • Antenna Analyzer • Antenna tuners

  13. Trees Towers or masts Covenants and antenna restrictions must be considered. Antenna Supports

  14. Review Test Questions • T9A01, 02, 06, 08 through 12 • T9C07, 09, 10

  15. Next Time • Power Supplies and Batteries • Handheld Transceivers • RF Interference • Read 3-24 through 3-33

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