James Clerk Maxwell noticed wavelike characteristics of light and discovered that they also had electrical and magnetic properties too. Wireless telegraphy was first demonstrated by an American Dentist named Mahlon Loomis. With the help of Henirich Rudolph Hertz, they predicted that rapid variations of electric current could be shot up into space, similar heat and light. The first radio signal is sent and received in Italy by an inventor named Guglielmo Marconi. Marconi continued to make innovations in radio wave technology. In 1895 he sent the first radio signal across the English Channel, and in 1899 he received the letter ‘S’ from England to Newfoundland. Radio Technology is Patented by Nikola Tesla The History of Radio Waves 1865 1866 1886 1886 1899 1943 James Clerk Maxwell Mahlon Loomis Heinrich Rudolf Hertz Nickola Tesla
Mobile Computing In order for a device to be considered to have the ability of wireless mobile computing: Mobile Communication Mobile Hardware Mobile Software Must Address any Adhoc issues to enusre communication is smooth and plausible The correct hardware must be onboard to support such communications and hold the software needed to operate The software allows for the hardware to operate as it should . It also provides the chareacteristics and requirements of the mobile application. Mobile computing allows the user to take a device out of a single pre set location to operate and have access to the data they would have access normally. Usually this also means having access to the internet and the ability to communicate with others
WiFi Devices Which Can Are Capable Of WiFi: Wifi is a method in which a device can send and receive data wirelessly. A Hotspot is required and can cover from a small room all the way up to many square miles. The name ‘WiFi’ is a brand which trademarked the name of the mechanism but is now used as a common term for wireless communication. <ul><li>Personal Computer </li></ul><ul><li>Video Game Console </li></ul><ul><li>Tablet </li></ul><ul><li>Digital Audio Player </li></ul>+Many more Security With all wireless technologies, security can sometimes become an issue. WiFi in its early days had a notoriously easy encryption to break. Soon after WEP was was scrapped for much more secure protocols such as WPA and WPA2.
Satellite Television Similar to normal broadcast television, satellite television uses a wireless signal to directly contact the users home device and vice versa. The radio signal is sent from a large broadcasting antenna first, then to a satellite which is sent back down to the receiving television receiver. With the Earth being a curved shape, a radio signal bounces off the surface making it impossible to send a satellite signal across the world uninterrupted. A satellite stops this from happening. Why? Early satellite television was broadcast in C-band radio -- radio in the 3.7-gigahertz (GHz) to 6.4-GHz frequency range. Digital broadcast satellite transmits programming in the Ku frequency range (11.7 GHz to 14.5 GHz ).
Satellite Television How it works Programming Source Broadcast Center Satellites Receiver The Channels and content the provider is broadcasting. This is usually not original content but comes from other sources like FOX or the BBC. This is where the broadcast signal from broadcasters is received. The data is then beamed upward to satellites in orbit. The signal is then received by the satellite and the data is then beamed back down to a broadcast station to be rebroadcast to a new area. The new signal is picked up by a viewers dish and processed by the receiver into a watchable format. Programming Source Broadcast Center Satellites Programming Source Broadcast Center Receiver Satellites Programming Source Broadcast Center
Mobile & Cordless Phones Almost everyone in Britain now owns a mobile phone. Just over 40 million Britons own one with 85% of the adult population with a lot of teens contributing to this figure. Although phones now can operate with multiple tasks and applications the main idea of how they make and receive calls is still the same. What makes a mobile phone different from a radio is the way it can distribute a signal on over 800 frequencies instead of only a few. This is possible due to its low power usage. A Signal is sent to a base station which is closest in the ‘cell’ surrounding the user. A signal is sent from the phone to the base station and vice versa. The base station will then connect to a base station closest to the mobile phone you are trying to reach which will then transmit a signal to their phone. In a land line, you are connected directly. Although they are much more complex to an average FM radio, they’re still essentially radios! Mobile Phones are Radios!
Navigation Radio signals are still in used to Navigate in many industries. Radio navigation uses various radio frequencies to pin point the users specific location on Earth. Radio navigation is mostly still used in the Aviation industry. GPS They’re 24 GPS satellites in orbit and fly at an altitude of 11,000 miles. At any given time, they’re usually 4-6 satellites available to Briton. To find your position, your GPS receiver sends a radio signal to at least 3 satellites. It uses these three satellites to create spheres surrounding them. Using where the spheres intersect in relation to the Earth is how your position is found. Radio signals are still used because in order to have everyone upgrade to a new technology would be difficult to organise therefore it could possibly be dangerous!
Bibliography Wikipedia (2011) Radio Waves [Online]. Available from: http:// en.wikipedia.org/wiki/Radio_waves [Accessed 19/01/11] Mary Bellis (n.d) History Of Radio [WWW] Available from: http:// inventors.about.com/od/rstartinventions/a/radio.htm [Accessed 19/01/2011] STEPH SCIENCE (2011) Maxwell [Online image] Available from: http://stephscience.edublogs.org/files/2011/10/JCM-1y379dn.jpg [Accessed 19/01/11] NNDB (n.d) Nickola Tesla [Online image] Available from: http://www.nndb.com/people/334/000022268/tesla64.jpg [Accessed 19/01/11] Wikipedia (n.d) Heinrich Hertz [Online image] Available from: http://upload.wikimedia.org/wikipedia/commons/thumb/5/50/Heinrich_Rudolf_Hertz.jpg/230px-Heinrich_Rudolf_Hertz.jpg [Accessed 19/01/11] About.com (n.d) Mahlon Loomis [Online image] Available from: http://0.tqn.com/d/inventors/1/7/N/_/Mahlon_Loomis.jpg [Accessed 19/01/11] Group Mobile (n.d) Wireless Technology [Online]. Available from: http://www.groupmobile.com/docs/products/TCO%20Insights%20On%20Rugged%20Mobile%20Computers.pdf [Accessed 19/01/11] BLM (10/20/09) Mobile Computing [Online]. Available from: http:// www.blm.gov/wo/st/en/prog/more/bea/Glossary.html#m [Accessed 19/01/11] Peter Roberts (2010) Mobile Computing [Online image] Available from: http://1.bp.blogspot.com/_70zmD7meWbQ/TNqsKK6sCFI/AAAAAAAAABk/UPdMPF2NMMk/s400/4welten_mobility.jpg [Accessed 19/01/11] CK Technical Services (n.d) Laptop [Online image] Available from: http://www.cktechnical.co.uk/Laptop_Repair_Screen_Cracked_Keyboard_Power_Broken_Charge_Fix_Bangor_Belfast.htm [Accessed 19/01/11] Karim Nice (n.d) Satellite Tv [WWW] Available from: http://electronics.howstuffworks.com/satellite-tv2.htm [Accessed 21/01/2011] Tech Times (n.d) Mobile Phone Figures [WWW] Available from: http://technology.timesonline.co.uk/tol/news/tech_and_web/article722629.ece [Accessed 21/01/2011] Wikipedia (2012) Iphone 3G [Online image] Available from: http://upload.wikimedia.org/wikipedia/commons/thumb/7/73/IPhone_3G.png/250px-IPhone_3G.png [Accessed 21/01/11] Gadgetthepline (2011) TomTom [Online image] Available from: http://blog.gadgethelpline.com/wp-content/uploads/2011/02/TomTomONE330SFront-300x236.jpg [Accessed 21/01/11] Symbols & Logos (2010) BBC Logo [Online image] Available from: http://symbolphotos.blogspot.com/2011/01/bbc-logo-photos.html [Accessed 21/01/11] Wikipedia (n.d) Radio Navigation [WWW] Available from: http:// en.wikipedia.org/wiki/Radio_navigation_aid [Accessed 21/01/2011] Marshall Brain (n.d) Radio Navigation [WWW] Available from: http:// electronics.howstuffworks.com/gadgets/travel/gps.htm [Accessed 21/01/2011]