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Radio Radio Waves

Radio Radio Waves. Reference. From the Ground Up Chapter 8.1: Radio Pages 209 - 213. Introduction. Radio is the transmission of signals through the air in the form of electromagnetic waves. It’s good to have a background understanding on how radio wave work when flying an aircraft.

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Radio Radio Waves

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  1. RadioRadio Waves

  2. Reference From the Ground Up Chapter 8.1: Radio Pages 209 - 213

  3. Introduction • Radio is the transmission of signals through the air in the form of electromagnetic waves. • It’s good to have a background understanding on how radio wave work when flying an aircraft.

  4. Outline • Wavelength • Frequency • Signal Characteristics

  5. Wavelength • Wavelength is the linear measurement of a wave (in meters) • A Cycle is the period that a wave vibrates between its crest and trough Wavelength

  6. Frequency • The Frequency is the cycles per second (in hertz) • Radio is in the electromagnetic spectrum between 3 kHz and 300 GHz Low Frequencies High Frequencies

  7. Frequency • Low/Medium Frequencies (LF/MF) • 30 KHz to 3000 KHz • Air navigation (NDB), short-wave radio • High Frequencies (HF) • 3,000 to 30,000 KHz • Air-ground communication, AM radio • Waves reflect off ionosphere, therefore have longer range • Very High Frequencies (VHF) • 30 to 300 MHz • Air navigation (VOR), aviation radio, FM radio • Ultra High Frequency (UHF) • 300 to 3000 MHz • Government use, air navigation (ILS, DME)

  8. Signal Characteristics • Ground Waves • Travel along earth’s surface • Dulled by obstacles • Sky Waves • Travels up into air • Certain frequencies reflect back to the surface from ionosphere • Skip Zone • Area between ground waves and sky waves • Transmissions very erratic or unheard • Line of Sight • VHF waves travels straight through air • Aircraft must see station to receive transmissions

  9. Signal Characteristics Receives sky waves No signal Radio station Surface of Earth

  10. Signal Characteristics Ionosphere In skip zone, Receives no signal Receivesground waves Receivesreflected sky waves

  11. Next Lesson 6.2 – Radio Communication From the Ground Up Chapter 8.4: Radio Communication Procedures Pages 219 - 229

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