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Radio Transmission

Radio Transmission. Moving information from place to place using Electro Magnetic Radiation. Types of transmission. Amplitude Modulation Frequency Modulation Phase Modulation Pulse Code Modulation. AM Waveforms. FM Waveforms. The carrier.

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Radio Transmission

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  1. Radio Transmission Moving information from place to place using Electro Magnetic Radiation

  2. Types of transmission.. • Amplitude Modulation • Frequency Modulation • Phase Modulation • Pulse Code Modulation

  3. AM Waveforms

  4. FM Waveforms

  5. The carrier.... • A high frequency ‘carrier’ takes information from one place to another. • The ‘carrier’ is considered to be a ‘radio frequency’ or RF. • The ‘information’ is attached to the carrier using AM, FM, or PCM or another method.

  6. The carrier is a Sine Wave

  7. Carrier velocity = v • The carrier travels at the speed of light • 186,000 miles/second • 300,000,000 meters/second

  8. Wavelength = v/f F = 1290 KHz ( WNBF Radio ) Λ = v/f = 300,000,000/1,290,000 = 232.5 meters

  9. Amplitude Modulation • Includes Broadcast Radio 540 KHz to 1640KHz • Citizen Band • Amateur Radio • Television Video

  10. Frequency Modulation • Broadcast FM from 88 MHz to 108 MHz • Aircraft, Marine, Taxi • Some digital transmissions • Television Audio • All Satellite Television

  11. Electro Magnetic Radiation

  12. Powerful Transmitters.. • 50 Kilo Watts into a large tower antenna • Can travel around the globe under certain weather conditions. • The signal strength is affected by many conditions including humidity, cloud cover and content, time of day, and the terrain.

  13. The receiver.... • Always has some type of antenna to catch the signal transmitted. • A radio direction finder has a ‘directional’ antenna. • The weak signal from the antenna is amplified. • The information is removed from the carrier.

  14. Noise is undesirable.. • Noise comes from many sources • It can interfere with the signal • AM is especially vulnerable • FM is preferred due to its immunity • TV Sound is FM, and generally quiet • AM Radio is often noisy- especially long distance reception.

  15. Parts of an AM Radio • Power Supply • Tuner - Selects a desired frequency • RF Amplifier • Frequency Converter • Intermediate Frequency Amplifier • Detector • Audio Amplifier

  16. Radio Waves - Wave Length • The speed of light.... • The frequency of the signal • The length of a wave • V = Lambda X F

  17. The speed of light... • 186,000 Miles per Second • 300,000,000 Meters / Second • 1 Foot/Nano Second • 1 Nano Second is 1 billionth of a second.

  18. Antennas are related to wavelength. • A quarter Wavelength... • Or multiples of a quarter wavelength used for best reception. • See part 2

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