Individual presentation by Henry Lau


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Individual presentation by Henry Lau

  1. 1. Radio waves! By Henry Lau Media Production TECH 1002 Studies in Media Technology 1
  2. 2. What are they?Radio waves are simply wavelengths made fromelectromagnetic radiation which are part of theelectromagnetic spectrum. They were put into thegroup based off its frequency and its constantwavelength. This means there are several otherswhich were grouped together to create the wholeelectromagnetic spectrum. Several examplesinclude:Gamma radiationX-ray radiationUltraviolet radiationVisible radiationMicrowave radiation Media Production TECH 1002 Studies in Media Technology 2
  3. 3. Why do we use them?We mainly use them tocarry across (transmit)long distanceinformation. It iscurrently the mostefficient method next tothe internet. It can rangefrom basic Morse code tovoice to voicecommunication. Media Production TECH 1002 Studies in Media Technology 3
  4. 4. Why are they important?During our everyday lives most of us rely onthe use radio waves whether we realise it ornot. Despite this radio waves are constantlybeing used to transmit information across thewhole world. Its used as the base for mostwireless communication and invisible hencewhy we’re mostly unaware when we’re usingit. Without radio waves the majority of ourcommunication devices wouldnt’ workincluding mobile phones, radio broadcastingstations and even television! Media Production TECH 1002 Studies in Media Technology 4
  5. 5. What uses radio waves?Television signalsWireless internetRadio stationsMobile phonesGarage door openersPolice radiosGPS devicesWireless clocksEtc… Media Production TECH 1002 Studies in Media Technology 5
  6. 6. Wi-FiWireless network or Wi-Fi is exactly what It sounds like, wirelessinternet which can be used almost everywhere. Quite often, theirservices (sometimes free) are provided in several hotspots such ascafes, libraries and hotels.Wi-Fi also uses radio waves, similar to how radios have a two waycommunication.The process starts by the device (laptop/mobile) translating datainto a radio wave and sends it to router through the access point.the router then sends the information to the internet through awired connection. With the information received the process goes inreverse till the original device obtains that information.Wi-Fi uses frequencies ranging from 2.4GHz to 5GHz, this isconsidered higher than usual frequencies due to the devicesrequiring more information than say a television or walkie-talkie. Media Production TECH 1002 Studies in Media Technology 6
  7. 7. TelevisionTelevisions are used almost everyday by everyone, whether itbeing for casual entertainment or watching the news, it playsa huge part in our lives today.The process starts by mixing 2 electrical signals, one from amicrophone for sound and one from a video camera. This iscalled Modulation. The audio uses Amplitude Modulation (AM)and the images uses the Frequency Modulation (FM). The TVantenna then picks up the carrier wave and then re convertsthe signal back into the original format allowing us to seewhat we would usually expect on the screen. This is knownas demodulation.The frequency used for television ranges from around470MHz to 865MHz. Media Production TECH 1002 Studies in Media Technology 7
  8. 8. Mobile PhonesMobile phones in this generation, is probably the most important piece oftechnology we’ve ever used so much in our lives, around 60% of the UKpopulation use mobile phones today.The mobile phone works through using radio waves, transmitting andreceiving information such as computer data, speech and so much more.The mobile first sends frequency signals from the nearest base station, withthis the signal then gets transmitted to the main telephone network throughcables or a different frequency (usually higher than the original) on anantenna. At the main network, the network finds the specific mobile andsends the signal to it in reverse through another base station which coverswhere the mobile is currently in. depending on the mobile’s status thesecond mobile sends back information the original phone instantly, thisconstantly occurs till the communication with each device ends through userinput or loss of signal.Mobile phones services operate in several frequencies ranging from 872 to960 MHz, 1710 to 1875 MHz and 1920 to 2170 MHZ. Media Production TECH 1002 Studies in Media Technology 8
  9. 9. BibliographyHow Do WiFi Wireless Networks Work. 2012. How Do WiFi Wireless Networks Work. [ONLINE]Available at: [Accessed 29 January 2012].HowStuffWorks "What Is WiFi?". 2012. HowStuffWorks "What Is WiFi?". [ONLINE] Available at: [Accessed 29 January 2012].HowStuffWorks "How Radio Works". 2012. HowStuffWorks "How Radio Works". [ONLINE] Available at: [Accessed 29 January 2012].What are radio waves?. 2012. What are radio waves?. [ONLINE] Available at:[Accessed 29 January 2012].Radio and Television. 2012. Radio and Television. [ONLINE] Available at: [Accessed 30 January 2012].Mobile Phone Base Stations - How Mobile Phone Networks Work. 2012. Mobile Phone Base Stations -How Mobile Phone Networks Work. [ONLINE] Available at: [Accessed30 January 2012]. Media Production TECH 1002 Studies in Media Technology 9
  10. 10. Bibliography continuedTV Channels and Frequency Bands. 2012. TV Channels and Frequency Bands. [ONLINE] Available at: [Accessed 30 January 2012].tv vector - eps, ai, cdr, svg, pdf. 2012. tv vector - eps, ai, cdr, svg, pdf. [ONLINE] Available at: [Accessed 30 January 2012].TomTom Language Bug | XarJ Blog and Podcast. 2012. TomTom Language Bug | XarJ Blog andPodcast. [ONLINE] Available at: [Accessed 30January 2012].Bodet Time solutions that work for you. 2012. Wireless clock system. [ONLINE] Available at: [Accessed 30January 2012].Mobile Phone Style Vector Icon | Free Icon | All Free Web Resources for Designer - Web Design Hot!.2012. Mobile Phone Style Vector Icon | Free Icon | All Free Web Resources for Designer - Web DesignHot!. [ONLINE] Available at: [Accessed 30 January 2012].The Electromagnetic Spectrum: Home page . 2012. The Electromagnetic Spectrum: Home page .[ONLINE] Available at: [Accessed 30 January 2012]. Media Production TECH 1002 Studies in Media Technology 10