Radio Waves
In the modern society, radio is the most widely used medium of broadcasting and electronic communication : it plays a major role in many areas such as public safety, industrial manufacturing, processing, agriculture, transportation, entertainment, national defense, space travel, overseas communication, news reporting and weather forecasting. In radio broadcasts, they use the radio waves which can be both microwaves and longer radio waves. These are transmitted in two ways: amplitude modulation (AM ) and frequency modulation
( FM ). These two kinds of wave have many differences.
Radio waves are among the many types of electromagnetic waves that travel within the electromagnetic spectrum. Radio waves can be defined by their frequency (in hertz, after Heinich Hertz , who first produced radio waves electronically), which is number of times they pass through a complete cycle per second; or by their wavelength, which is determined by the distance (by meters) that is traveled from the crest of one wave to the crest of the next.
Radio frequencies are measured in units called kilohertz, megahertz, and gigahertz. (1 kilohertz = 1000 hertz : 1 megahertz = 106 hertz, 1 gigahertz =
109 hertz). All radio waves fall within a frequency range of 3 kilohertz, or
3000 cycles per second to 30 gigahertz. Within the range of frequencies, radio waves are further divided into two groups or bands such as very low frequency (
VLF 10-30 kHz ), low frequency (LF 30-300 KHz), medium frequency ( MF 300-3000
KHz), high frequency ( HF 3-30 MHZ) and very high frequency ( VHF 30-300MHZ).
Amplitude modulation is the oldest method of transmitting voice and music through the airwaves is by amplitude modulation. This is accomplished by combining a sound wave from a microphone, tape, record, or CD with a "carrier" radio wave. The result : a wave that transmits voice or programming as its amplitude ( intensity ) increases and decreases. Amplitude modulation is used by station broadcasting in the AM band and by most international short wave stations. Frequency modulation is another way to convey information, voice , and music on a radio wave is to slightly change, or modulate, the frequency. The main advantage of FM broadcasting is of it is static free. But the drawback to
FM is since the frequency is varied, station takes up more room on the band.
Frequency modulation is, of course, used on the FM band. And it is used for
"action band" and ham transmission in the VHF/UHF frequency range.
In amplitude modulation, what is modified is the amplitude of a carrier wave on one specific frequency.
wave to form, the surging tide must meet an obstacle. When the ocean meets the
walking across them. The lines and pulleys and some parts of the waves are example of
Actually we use MP3 Players, iPods and other mobile devices to hear our music, some people still use cd players (For example: ME), In that time they have FM Radio, so they could be able to hear their music.
Over the years, many people all over have listened to the radio for entertainment and information. Radio supplies news, sports, music, talk, and many other options with great ease. However, since television has become so popular lately, people look to it as an alternative to radio for the previously stated options. The reason for this can be linked to the redundancy that radio has encountered by not offering anything new and exciting for people to become interested about. Now, XM radio has solved this problem by giving people something new to look forward to by offering their services to anyone who wants to try something new. XM Radio uses satellites positioned in space to allow people to listen to the radio across the United States without having to be bothered with changing stations. This luxury has gotten consumers and analysts very excited and has been receiving a lot of hype in the media lately. The advanced methods of broadcasting will supply XM Radio with more appealing features to listeners than existing entertainment. As a result, those who are bored with the current condition of radio entertainment may use XM more than FM and AM radio.
However, satellite radio is banking on a commercial free format to steal listeners away from terrestrial radio. Sirius offers 65 commercial free channels of music and 55 news, sports and talk stations. And the one thing that satellite has over its less lofty competitor is that you can’t loose the signal as you drive across America. The two major competitors for the satellite radio listeners are Sirius and XM.
Traditional (AM/FM) Radio - it is currently free, but only offers a homogenous shallow play lists with medium audio quality.
Imagine living a completely normal life which suddenly deteriorates into depression, cynicism, and obsession. At the beginning of the story, “The Enormous Radio”, Irene Westcott's life is as simple as can be. She has average income, aspirations, and overall, a very typical life. Despite this, the arrival of a mysterious radio turns her life upside down and ultimately drives her into obsession and doubt about her friends, life and family. In the end, the intrusive radio negatively impacts her interpersonal relationships, encourages her to judge others and most significantly, completely destroys her emotionally. John Cheever’s “The Enormous Radio” acts as a cautionary tale in which Irene's dramatic collapse into doubt and depression warns the
All The Light We Cannot See: Radio A spark ignites life within the embodiment of a metal case. As Werner, one of the main characters in the novel “All The Light We Cannot See”, mends the copper conduits a spark pulses through wire, circuitry and antenna. The sparks bend into vitality, crafted outside it’s engineered purpose. The vitality manipulates electromagnetic waves producing sound and thought.
Traditional AM/FM Radio. Sirius’s competition also includes traditional AM/FM radio. Unlike SIRIUS radio, traditional AM/FM radio has had a well established market for its services for many years and generally offers free broadcast reception paid for by commercial advertising rather than by a subscription fee. Also, many radio stations offer information programming of a local nature, such as local news and sports, which Sirius does not offer as effectively as local radio. Some radio stations also have begun reducing the number of commercials per hour, expanding the range of music played on the air and experimenting with new formats in order to compete more directly with satellite radio services.
Radio-wave technology is one of the most important technologies used by man. It has forever changed the United States and the world, and will continue to do so in the future. Radio has been a communications medium, a recreational device, and many other things to us. When British physicist James Clerk Maxwell published his theory of electromagnetic waves in 1873, he probably never could have envisioned the sorts of things that would come of such a principle. His theory mainly had to do with light waves, but fifteen years later, a German physicist named Heinrich Hertz was able to electrically generate MaxwellÕs ÒraysÓ in his lab. The discovery of these amazing properties, the later invention of a working wireless radio, and the resulting technology have been instrumental to AmericaÕs move into the Information Age. The invention of radio is commonly credited to Guglielmo Marconi, who, starting in 1895, developed the first ÒwirelessÓ radio transmitter and receiver. Working at home with no support from his father, but plenty from his mother, Marconi improved upon the experiments and equipment of Hertz and others working on radio transmission. He created a better radio wave detector or cohere and connected it to an early type of antenna. With the help of his brothers and some of the neighborhood boys he was able to send wireless telegraph messages over short distances. By 1899 he had established a wireless communications link between England and France that had the ability to operate under any weather conditions. He had sent trans-Atlantic messages by late 1901, and later won the Nobel prize for physics in 1909. Radio works in a very complicated way, but hereÕs a more simple explanation than youÕll get from most books: Electromagnetic waves of different wavelengths are produced by the transmitter, and modulations within each wavelength are adjusted to carry ÒencodedÓ information. The receiver, tuned to read the frequency the transmitter is sending on, then takes the encoded information (carried within the wave modulations), and translates it back into the sensory input originally transmitted. Many of the men who pioneered radio had designs for it. Marconi saw it as the best communication system and envisioned instant world-wide communication through the air. David Sarnoff ( later the head of RCA and NBC) had a vision of Òa radio receiver in every homeÓ in 1916, although the real potential of radio wasnÕt realized until after World War I.
The actual product is a tangible product. As a radio station, their actual products definitely are the channels, radio programmes and DJs. There are three channel frequencies such as FM 881, FM 903 and AM 864. Yet, the radio programmes are mainly provided in FM and clearly targeted to different levels of audience.
Architectural difference: 3G network architecture is the radio terminal base stations (BTS) aggregate the radio Access
Once again, radio is currently at a crucial stance. FM radio was once the means in which someone could find out about new music artists, hear their favorite top songs, and catch up on local/world news. However, with the surge of the Internet at the turn of the century, the role of the radio starts to diminish. The Internet can now be used for gathering local news or weather in a fast and efficient manner. It can also be used as a way for music fans to find new artists similar to ones that they currently like, and (although not legal) ease in the process of downloading complete albums in high-quality formats for free. CD and MP3 players are now very popular for the person “on-the-go,” and as a result, it’s very easy to find people that remark: “I don’t listen to radio.” The reason for this is that radio has lost its niche. No longer is radio as convenient of a means to get news and experience new or popular music. Radio is forced, once again, to innovate itself in order to keep from being eliminating by the more popular types of med...
Instead, they pass through the atmosphere and go into space. AM signals, however, reflect off the atmosphere and travel back down to earth, causing broadcasts to be received at a much greater distance than FM signals. Since FM travels all the way to space and it does not bounce off the ground it does not create as much static as AM does. Radio waves, which travel at the speed of light, cannot be seen, heard, or felt in any way. When you listen to the radio, contrary to what some think, you are hearing the receivers pick up the waves and turn them into sound.