IntroductionThis presentation will cover some topics about radio waves: How they work Uses of radio waves in modern times (beyond broadcasting) Conclusion
How do radio waves work?A radio wave, in simple terms is a carrier wave that carriesinformation from one point (the transmitter) to another (thereceiver). The wave however is not a vibration, as sounds wavesare, they are electro-magnetic waves self propagating electro-magnetic effect which means it is a pulsing stream ofenergy, this allows it to travel through mediums that other wavescan not such as a vacuum.Each radio wave has a specific frequency or band offrequencies which corresponds to the in. The receiver thenproduces small electric currents as the radio wave flows past it.These currents are not the information the radio wave istransmitting (a song for example) but the digital representation ofit.
Uses of radio wavesRadio waves are used all the time in todays society, they are a veryimportant part of how our technology works and interacts with eachother. Radio waves are so versatile in their use they crop upeverywhere from saving lives in hospitals to saving space on yourcomputer desk with a wireless mouse.Here are some common uses: WiFi Hospital equipment Mobile telephone communication Universal remote controls (RC cars) TelevisionAnd many, many others
Uses continued…Mobile phone communicationMobile phones could simply not work, or not work anywhere near aswell without radio waves. Cell phones emits small amounts ofelectromagnetic waves (radio waves) to the radio tower. Containingthe radio equipment. These towers connect the calls to the other cellphone you are trying to call, as the towers can only transmit a certaindistance (see image below) they have to transmit to each othercreating a link from the person calling and the person receiving thecall.
WiFiWireless networking is a vital part of our everyday lives nowand makes connecting to other devices and the internet veryeasy. They are very easy to set up and have countless uses.The devices has a wireless adapter that translates the datafrom the device into a radio wave, it is then transmitted thewireless router, which is the key component and HUB of thenetwork. The router then decodes the radio waves and sendsthe signal to the internet, creating a wireless path from thedevice to the internet. As WiFi hotspots are being set up allaround the country it is becoming increasingly easy to beconstantly online and connected with the rest of the world.
Radio controlled devicesRadio waves are also used in recreation and leisure activities aswell such as radio controlled vehicles. This works in the exactsame way, the controller the user holds is the transmitter,transmitting the inputs the user is giving directly to the receiverantenna circuit board fixed into the toy vehicle. This interncontrol the many inner working of the toy, the motor, steeringand any other gadgets involved. However some of the lesserquality RC cars have the same frequency or band of frequenciesand so you might find your car being controlled by someone elsedue to interference.
ConclusionRadio waves have become a big part of our society, they makeour lives easier and keep us connected with eachother, whether that be through the ever increasing connectedworld wide web through social networking, or directly to eachother with a mobile phone call.However as our technology progresses I feel radio waves willbe used less and less and eventually disappear asnew, better, higher quality techniques are developed oftransmitting data. There is no doubt that radio waves haveimproved our society outside the obvious broadcastingpotential they have brought us.
BibliographyInformation:http://www.clker.com/clipart-23862.htmlhttp://electronics.howstuffworks.com/cell-phone1.htmhttp://computer.howstuffworks.com/computer-networking-pictures17.htmPictures (in order of appearance):http://uk.answers.yahoo.com/question/index?qid=20061117085931AASFFd8http://electronics.howstuffworks.com/cell-phone1.htmhttp://www.howstuffworks.com/wireless-network.htmhttp://www.howstuffworks.com/rc-toy.htm