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radio waves

Lau Siu Ching Jonathan
            p08294715
According to an online encyclopedia,
  the definition of radio waves are a type of
 electromagnetic radiation with wavelengths
in the electromagnetic spectrum longer than
                 infrared light.
James Clerk Maxwell first formally assumed the existence of
   electromagnetic waves and it was confirmed by Heinrich
                  Rudolf Hertz afterwards.
Radio waves were broadly used during the
early history of radio to produce radio
instruments. The radio technology
development began as “wireless telegraphy”.
Radio broadcasting is a one-way wireless
transmission over radio waves which reaches
          a wide range audiences.

                     -

   There are two types of modulation used
in the process of radio broadcasting and they
 are AM broadcasting and FM broadcasting.
AM broadcasting (amplitude modulation)
 It is the first method of broadcasting sound on
 a radio signal and is still widely used today.
 Amplitude modulation was used for a small
scale voice and music broadcasts until the
 World War One.
FM broadcasting (frequency modulation)
FM radio was invented in the 1930s for
overcoming the interferences problems the AM
radios were facing. And it was made possible
 by
spacing station further apart. Frequency
modulation stations are much more popular
since higher sound quality and stereo
broadcasting became the common format.
Cellular network
It is a radio network distributed over land areas
called cells, which are transmitted through
fixed-location transceiver known as a cell site
or a base station.
Cellular networks are now widely used because
of its advantages, for example it allows a big
range of people using it at the same time, it
reduces power use, and it covers a large area
without huge interference from other signals.
Nowadays, people use them daily with
 portable
transceivers (mobile phones/ smart phones).
Cellular network was launched in Japan in 1979
as the 1st Generation (1G). But it was replaced
but the 2nd Generation (2G) digital
telecommunication in a year after it was
launched. In May 2001, the 3rd Generation (3G)
was released and the transmission rates are
higher than before and improving.
In 2009, the 4th Generation (4G) was
introduced and it is based on cellular wireless
standards. It is now available for a pre-release
trial as a form of LTE (Long-term-evolution) and
it will be available late 2012.

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Radiowaves

  • 1. radio waves Lau Siu Ching Jonathan p08294715
  • 2. According to an online encyclopedia, the definition of radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
  • 3. James Clerk Maxwell first formally assumed the existence of electromagnetic waves and it was confirmed by Heinrich Rudolf Hertz afterwards.
  • 4. Radio waves were broadly used during the early history of radio to produce radio instruments. The radio technology development began as “wireless telegraphy”.
  • 5. Radio broadcasting is a one-way wireless transmission over radio waves which reaches a wide range audiences. - There are two types of modulation used in the process of radio broadcasting and they are AM broadcasting and FM broadcasting.
  • 6. AM broadcasting (amplitude modulation) It is the first method of broadcasting sound on a radio signal and is still widely used today. Amplitude modulation was used for a small scale voice and music broadcasts until the World War One.
  • 7. FM broadcasting (frequency modulation) FM radio was invented in the 1930s for overcoming the interferences problems the AM radios were facing. And it was made possible by spacing station further apart. Frequency modulation stations are much more popular since higher sound quality and stereo broadcasting became the common format.
  • 8. Cellular network It is a radio network distributed over land areas called cells, which are transmitted through fixed-location transceiver known as a cell site or a base station.
  • 9. Cellular networks are now widely used because of its advantages, for example it allows a big range of people using it at the same time, it reduces power use, and it covers a large area without huge interference from other signals. Nowadays, people use them daily with portable transceivers (mobile phones/ smart phones).
  • 10. Cellular network was launched in Japan in 1979 as the 1st Generation (1G). But it was replaced but the 2nd Generation (2G) digital telecommunication in a year after it was launched. In May 2001, the 3rd Generation (3G) was released and the transmission rates are higher than before and improving.
  • 11. In 2009, the 4th Generation (4G) was introduced and it is based on cellular wireless standards. It is now available for a pre-release trial as a form of LTE (Long-term-evolution) and it will be available late 2012.