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Radio waves!
            By Henry Lau




     Media Production TECH 1002
     Studies in Media Technology   1
What are they?
Radio waves are simply wavelengths made from
electromagnetic radiation which are part of the
electromagnetic spectrum. They were put into the
group based off its frequency and its constant
wavelength. This means there are several others
which were grouped together to create the whole
electromagnetic spectrum. Several examples
include:
Gamma    radiation
X-ray radiation
Ultraviolet radiation
Visible radiation
Microwave radiation

                                  Media Production TECH 1002
                                  Studies in Media Technology   2
Why do we use them?
We mainly use them to
carry across (transmit)
long distance
information. It is
currently the most
efficient method next to
the internet. It can range
from basic Morse code to
voice to voice
communication.


                             Media Production TECH 1002
                             Studies in Media Technology   3
Why are they important?
During our everyday lives most of us rely on
the use radio waves whether we realise it or
not. Despite this radio waves are constantly
being used to transmit information across the
whole world. Its used as the base for most
wireless communication and invisible hence
why we’re mostly unaware when we’re using
it. Without radio waves the majority of our
communication devices wouldn't’ work
including mobile phones, radio broadcasting
stations and even television!

                                Media Production TECH 1002
                                Studies in Media Technology   4
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
Wi-Fi
Wireless network or Wi-Fi is exactly what It sounds like, wireless
internet which can be used almost everywhere. Quite often, their
services (sometimes free) are provided in several hotspots such as
cafes, libraries and hotels.
Wi-Fi also uses radio waves, similar to how radios have a two way
communication.
The process starts by the device (laptop/mobile) translating data
into a radio wave and sends it to router through the access point.
the router then sends the information to the internet through a
wired connection. With the information received the process goes in
reverse till the original device obtains that information.

Wi-Fi uses frequencies ranging from 2.4GHz to 5GHz, this is
considered higher than usual frequencies due to the devices
requiring more information than say a television or walkie-talkie.


                                                Media Production TECH 1002
                                                Studies in Media Technology   6
Television
Televisions are used almost everyday by everyone, whether it
being for casual entertainment or watching the news, it plays
a huge part in our lives today.
The process starts by mixing 2 electrical signals, one from a
microphone for sound and one from a video camera. This is
called Modulation. The audio uses Amplitude Modulation (AM)
and the images uses the Frequency Modulation (FM). The TV
antenna then picks up the carrier wave and then re converts
the signal back into the original format allowing us to see
what we would usually expect on the screen. This is known
as demodulation.

The frequency used for television ranges from around
470MHz to 865MHz.

                                          Media Production TECH 1002
                                          Studies in Media Technology   7
Mobile Phones
Mobile phones in this generation, is probably the most important piece of
technology we’ve ever used so much in our lives, around 60% of the UK
population use mobile phones today.
The mobile phone works through using radio waves, transmitting and
receiving information such as computer data, speech and so much more.
The mobile first sends frequency signals from the nearest base station, with
this the signal then gets transmitted to the main telephone network through
cables or a different frequency (usually higher than the original) on an
antenna. At the main network, the network finds the specific mobile and
sends the signal to it in reverse through another base station which covers
where the mobile is currently in. depending on the mobile’s status the
second mobile sends back information the original phone instantly, this
constantly occurs till the communication with each device ends through user
input or loss of signal.

Mobile phones services operate in several frequencies ranging from 872 to
960 MHz, 1710 to 1875 MHz and 1920 to 2170 MHZ.


                                                     Media Production TECH 1002
                                                     Studies in Media Technology   8
Bibliography
How Do WiFi Wireless Networks Work. 2012. How Do WiFi Wireless Networks Work. [ONLINE]
Available at: http://www.pool-king.com/wireless/wireless-networks.php. [Accessed 29 January 2012].

HowStuffWorks "What Is WiFi?". 2012. HowStuffWorks "What Is WiFi?". [ONLINE] Available at:
http://computer.howstuffworks.com/wireless-network1.htm. [Accessed 29 January 2012].

HowStuffWorks "How Radio Works". 2012. HowStuffWorks "How Radio Works". [ONLINE] Available at:
http://electronics.howstuffworks.com/radio4.htm. [Accessed 29 January 2012].

What are radio waves?. 2012. What are radio waves?. [ONLINE] Available at:
http://www.qrg.northwestern.edu/projects/vss/docs/communications/1-what-are-radio-waves.html.
[Accessed 29 January 2012].

Radio and Television. 2012. Radio and Television. [ONLINE] Available at:
http://www.scribd.com/doc/1028/Radio-and-Television. [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:
http://www.ofcom.org.uk/static/archive/ra/topics/mpsafety/school-audit/mobilework.htm. [Accessed
30 January 2012].




                                                                    Media Production TECH 1002
                                                                    Studies in Media Technology      9
Bibliography continued
TV Channels and Frequency Bands. 2012. TV Channels and Frequency Bands. [ONLINE] Available at:
http://www.gbaudio.co.uk/atchannels.pdf. [Accessed 30 January 2012].

tv vector - eps, ai, cdr, svg, pdf. 2012. tv vector - eps, ai, cdr, svg, pdf. [ONLINE] Available at:
http://tvvector.blogspot.com/. [Accessed 30 January 2012].

TomTom Language Bug | XarJ Blog and Podcast. 2012. TomTom Language Bug | XarJ Blog and
Podcast. [ONLINE] Available at: http://www.xarj.net/2008/tomtom-language-bug/. [Accessed 30
January 2012].

Bodet Time solutions that work for you. 2012. Wireless clock system. [ONLINE] Available at:
http://www.bodet.co.uk/clock-systems/select-a-technology/wireless-clock-system.html. [Accessed 30
January 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 Design
Hot!. [ONLINE] Available at: http://www.webdesignhot.com/free-icon/mobile-phone-style-vector-
icon/. [Accessed 30 January 2012].

The Electromagnetic Spectrum: Home page . 2012. The Electromagnetic Spectrum: Home page .
[ONLINE] Available at: http://www.darvill.clara.net/emag/index.htm. [Accessed 30 January 2012].




                                                                           Media Production TECH 1002
                                                                           Studies in Media Technology   10

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Individual presentation by Henry Lau

  • 1. Radio waves! By Henry Lau Media Production TECH 1002 Studies in Media Technology 1
  • 2. What are they? Radio waves are simply wavelengths made from electromagnetic radiation which are part of the electromagnetic spectrum. They were put into the group based off its frequency and its constant wavelength. This means there are several others which were grouped together to create the whole electromagnetic spectrum. Several examples include: Gamma radiation X-ray radiation Ultraviolet radiation Visible radiation Microwave radiation Media Production TECH 1002 Studies in Media Technology 2
  • 3. Why do we use them? We mainly use them to carry across (transmit) long distance information. It is currently the most efficient method next to the internet. It can range from basic Morse code to voice to voice communication. Media Production TECH 1002 Studies in Media Technology 3
  • 4. Why are they important? During our everyday lives most of us rely on the use radio waves whether we realise it or not. Despite this radio waves are constantly being used to transmit information across the whole world. Its used as the base for most wireless communication and invisible hence why we’re mostly unaware when we’re using it. Without radio waves the majority of our communication devices wouldn't’ work including mobile phones, radio broadcasting stations and even television! Media Production TECH 1002 Studies in Media Technology 4
  • 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. Wi-Fi Wireless network or Wi-Fi is exactly what It sounds like, wireless internet which can be used almost everywhere. Quite often, their services (sometimes free) are provided in several hotspots such as cafes, libraries and hotels. Wi-Fi also uses radio waves, similar to how radios have a two way communication. The process starts by the device (laptop/mobile) translating data into a radio wave and sends it to router through the access point. the router then sends the information to the internet through a wired connection. With the information received the process goes in reverse till the original device obtains that information. Wi-Fi uses frequencies ranging from 2.4GHz to 5GHz, this is considered higher than usual frequencies due to the devices requiring more information than say a television or walkie-talkie. Media Production TECH 1002 Studies in Media Technology 6
  • 7. Television Televisions are used almost everyday by everyone, whether it being for casual entertainment or watching the news, it plays a huge part in our lives today. The process starts by mixing 2 electrical signals, one from a microphone for sound and one from a video camera. This is called Modulation. The audio uses Amplitude Modulation (AM) and the images uses the Frequency Modulation (FM). The TV antenna then picks up the carrier wave and then re converts the signal back into the original format allowing us to see what we would usually expect on the screen. This is known as demodulation. The frequency used for television ranges from around 470MHz to 865MHz. Media Production TECH 1002 Studies in Media Technology 7
  • 8. Mobile Phones Mobile phones in this generation, is probably the most important piece of technology we’ve ever used so much in our lives, around 60% of the UK population use mobile phones today. The mobile phone works through using radio waves, transmitting and receiving information such as computer data, speech and so much more. The mobile first sends frequency signals from the nearest base station, with this the signal then gets transmitted to the main telephone network through cables or a different frequency (usually higher than the original) on an antenna. At the main network, the network finds the specific mobile and sends the signal to it in reverse through another base station which covers where the mobile is currently in. depending on the mobile’s status the second mobile sends back information the original phone instantly, this constantly occurs till the communication with each device ends through user input or loss of signal. Mobile phones services operate in several frequencies ranging from 872 to 960 MHz, 1710 to 1875 MHz and 1920 to 2170 MHZ. Media Production TECH 1002 Studies in Media Technology 8
  • 9. Bibliography How Do WiFi Wireless Networks Work. 2012. How Do WiFi Wireless Networks Work. [ONLINE] Available at: http://www.pool-king.com/wireless/wireless-networks.php. [Accessed 29 January 2012]. HowStuffWorks "What Is WiFi?". 2012. HowStuffWorks "What Is WiFi?". [ONLINE] Available at: http://computer.howstuffworks.com/wireless-network1.htm. [Accessed 29 January 2012]. HowStuffWorks "How Radio Works". 2012. HowStuffWorks "How Radio Works". [ONLINE] Available at: http://electronics.howstuffworks.com/radio4.htm. [Accessed 29 January 2012]. What are radio waves?. 2012. What are radio waves?. [ONLINE] Available at: http://www.qrg.northwestern.edu/projects/vss/docs/communications/1-what-are-radio-waves.html. [Accessed 29 January 2012]. Radio and Television. 2012. Radio and Television. [ONLINE] Available at: http://www.scribd.com/doc/1028/Radio-and-Television. [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: http://www.ofcom.org.uk/static/archive/ra/topics/mpsafety/school-audit/mobilework.htm. [Accessed 30 January 2012]. Media Production TECH 1002 Studies in Media Technology 9
  • 10. Bibliography continued TV Channels and Frequency Bands. 2012. TV Channels and Frequency Bands. [ONLINE] Available at: http://www.gbaudio.co.uk/atchannels.pdf. [Accessed 30 January 2012]. tv vector - eps, ai, cdr, svg, pdf. 2012. tv vector - eps, ai, cdr, svg, pdf. [ONLINE] Available at: http://tvvector.blogspot.com/. [Accessed 30 January 2012]. TomTom Language Bug | XarJ Blog and Podcast. 2012. TomTom Language Bug | XarJ Blog and Podcast. [ONLINE] Available at: http://www.xarj.net/2008/tomtom-language-bug/. [Accessed 30 January 2012]. Bodet Time solutions that work for you. 2012. Wireless clock system. [ONLINE] Available at: http://www.bodet.co.uk/clock-systems/select-a-technology/wireless-clock-system.html. [Accessed 30 January 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 Design Hot!. [ONLINE] Available at: http://www.webdesignhot.com/free-icon/mobile-phone-style-vector- icon/. [Accessed 30 January 2012]. The Electromagnetic Spectrum: Home page . 2012. The Electromagnetic Spectrum: Home page . [ONLINE] Available at: http://www.darvill.clara.net/emag/index.htm. [Accessed 30 January 2012]. Media Production TECH 1002 Studies in Media Technology 10