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Radio communication
Radio communication
Radio communication
Radio communication
Radio communication
Radio communication
Radio communication
Radio communication
Radio communication
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Radio communication

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Transcript

  • 1. Radio communication
    Nicole Barber
  • 2. History
    There is debate about who first invented the radio
    Marconi and Tesla both invented it at around the same time, but Marconi was eventually awarded the radio patent
    The first radio voice broadcast was by reginald Fessenden in 1906
  • 3. What are radio waves?
    A form of electromagnetic radiation
    Vary in wavelength (from 1mm – 100,000km)
    Travel at the speed of light
    Used for:- - Mobile radio communication - Broadcasting - Radar - Computer Networks - And more...
    Believed by some that they can cause Cancer and Leukaemia
  • 4. 4 Types...
    They are divided into 4
    Long Wave – 1-2km
    Medium Wave – 100m
    VHF – (very high frequency) 2m
    UHF – (ultra high frequency) <1m
  • 5. Amplitude Modulation – How It Works
    1. Data impressed onto an AC Carrier Waveform
    2. Modulation
    3. Data carried through radio waves
    4. Received by an antenna
    5. Demodulation
  • 6. Amplitude Modulation
  • 7. How Mobile Phones Work
    Mobile phones use "cells”
    Each cell has a base station at its centre.
    The base station sends and receives calls
    The mobile phone communicates with the base station using radio waves.
    As you move through cells, the calls are transmitted from the nearest base station
  • 8. Divided Into Cells...
  • 9. References
    wiseGEEK (n.d.) What are radio waves? [WWW] Available from: http://www.wisegeek.com/what-are-radio-waves.htm [Accessed 26/1/11]
    Wikipedia (24.1.11) Radio Waves [WWW] Available from: http://en.wikipedia.org/wiki/Radio_waves [Accessed 26/1/11]
    Darvill Clara (n.d.) Radio Waves [WWW] Available from: http://www.darvill.clara.net/emag/emagradio.htm [Accessed26/1/11]
    Ofcom (n.d.) How Mobile Phone Networks Work [WWW] Available from: http://stakeholders.ofcom.org.uk/sitefinder/glossary/how/ [Accessed 26/1/11)
    AskComReg (n.d.) Coverage [WWW] Available from: http://www.askcomreg.ie/mobile/coverage.44.LE.asp [Accessed 26/1/11]

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