Radio communication

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Radio communication

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

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