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Radio waves

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Presentation on how radio waves work and their uses.

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Radio waves

  1. 1. Radio waves
  2. 2. Introduction This presentation will cover some topics about radio waves:  How they work  Uses of radio waves in modern times (beyond broadcasting)  Conclusion
  3. 3. How do radio waves work? A radio wave, in simple terms is a carrier wave that carries information from one point (the transmitter) to another (the receiver). The wave however is not a vibration, as sounds waves are, they are electro-magnetic waves self propagating electro- magnetic effect which means it is a pulsing stream of energy, this allows it to travel through mediums that other waves can not such as a vacuum. Each radio wave has a specific frequency or band of frequencies which corresponds to the in. The receiver then produces small electric currents as the radio wave flows past it. These currents are not the information the radio wave is transmitting (a song for example) but the digital representation of it.
  4. 4. Uses of radio waves Radio waves are used all the time in todays society, they are a very important part of how our technology works and interacts with each other. Radio waves are so versatile in their use they crop up everywhere from saving lives in hospitals to saving space on your computer desk with a wireless mouse. Here are some common uses:  WiFi  Hospital equipment  Mobile telephone communication  Universal remote controls (RC cars)  Television And many, many others
  5. 5. Uses continued… Mobile phone communication Mobile phones could simply not work, or not work anywhere near as well without radio waves. Cell phones emits small amounts of electromagnetic waves (radio waves) to the radio tower. Containing the radio equipment. These towers connect the calls to the other cell phone you are trying to call, as the towers can only transmit a certain distance (see image below) they have to transmit to each other creating a link from the person calling and the person receiving the call.
  6. 6. WiFi Wireless networking is a vital part of our everyday lives now and makes connecting to other devices and the internet very easy. They are very easy to set up and have countless uses. The devices has a wireless adapter that translates the data from the device into a radio wave, it is then transmitted the wireless router, which is the key component and HUB of the network. The router then decodes the radio waves and sends the signal to the internet, creating a wireless path from the device to the internet. As WiFi hotspots are being set up all around the country it is becoming increasingly easy to be constantly online and connected with the rest of the world.
  7. 7. Radio controlled devices Radio waves are also used in recreation and leisure activities as well such as radio controlled vehicles. This works in the exact same way, the controller the user holds is the transmitter, transmitting the inputs the user is giving directly to the receiver antenna circuit board fixed into the toy vehicle. This intern control the many inner working of the toy, the motor, steering and any other gadgets involved. However some of the lesser quality RC cars have the same frequency or band of frequencies and so you might find your car being controlled by someone else due to interference.
  8. 8. Conclusion Radio waves have become a big part of our society, they make our lives easier and keep us connected with each other, whether that be through the ever increasing connected world wide web through social networking, or directly to each other with a mobile phone call. However as our technology progresses I feel radio waves will be used less and less and eventually disappear as new, better, higher quality techniques are developed of transmitting data. There is no doubt that radio waves have improved our society outside the obvious broadcasting potential they have brought us.
  9. 9. Bibliography Information: http://www.clker.com/clipart-23862.html http://electronics.howstuffworks.com/cell-phone1.htm http://computer.howstuffworks.com/computer-networking-pictures17.htm Pictures (in order of appearance): http://uk.answers.yahoo.com/question/index?qid=20061117085931AASFFd8 http://electronics.howstuffworks.com/cell-phone1.htm http://www.howstuffworks.com/wireless-network.htm http://www.howstuffworks.com/rc-toy.htm

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