Posts: 48
Threads: 27
Joined: Sep 2009
Reputation:
0
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.[n 1] When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.
Radio systems need a transmitter to modulate (change) some property of the energy produced to impress a signal on it, for example using amplitude modulation or angle modulation (which can be frequency modulation or phase modulation). Radio systems also need an antenna to convert electric currents into radio waves, and vice versa. An antenna can be used for both transmitting and receiving. The electrical resonance of tuned circuits in radios allow individual stations to be selected. The electromagnetic wave is intercepted by a tuned receiving antenna. A radio receiver receives its input from an antenna and converts it into a form usable for the consumer, such as sound, pictures, digital data, measurement values, navigational positions, etc.[2] Radio frequencies occupy the range from a 3 kHz to 300 GHz, although commercially important uses of radio use only a small part of this spectrum.[3]
Communication systems
A radio communication system sends signals by radio.[13] Types of radio communication systems deployed depend on technology, standards, regulations, radio spectrum allocation, user requirements, service positioning, and investment.[14]
The radio equipment involved in communication systems includes a transmitter and a receiver, each having an antenna and appropriate terminal equipment such as a microphone at the transmitter and a loudspeaker at the receiver in the case of a voice-communication system.[15]
The power consumed in a transmitting station varies depending on the distance of communication and the transmission conditions. The power received at the receiving station is usually only a tiny fraction of the transmitter's output, since communication depends on receiving the information, not the energy, that was transmitted.
Classical radio communications systems use frequency-division multiplexing (FDM) as a strategy to split up and share the available radio-frequency bandwidth for use by different parties communications concurrently. Modern radio communication systems include those that divide up a radio-frequency band by time-division multiplexing (TDM) and code-division multiplexing (CDM) as alternatives to the classical FDM strategy. These systems offer different tradeoffs in supporting multiple users, beyond the FDM strategy that was ideal for broadcast radio but less so for applications such as mobile telephony.
Posts: 59
Threads: 25
Joined: Jun 2009
Reputation:
0
Best Answer: == Advantages ==
* A universal medium. Can be enjoyed at home, at work, and while driving. Most people listen to the radio at one time or another during the day.
* Permits you to target your advertising dollars to the market most likely to respond to your offer.
* Permits you to create a personality for your business using only sounds and voices.
* Free creative help is usually available.
* Rates can generally be negotiated.
* Least inflated medium. During the past ten years, radio rates have gone up less than other media.
== == == Disadvantages ==
* Because radio listeners are spread over many stations, to totally saturate your market you have to advertise simultaneously on many stations.
* Listeners cannot refer back to your ads to go over important points.
* Ads are an interruption to the entertainment. Because of this, radio ads must be repeated to break through the listener's "tune out" factor.
* Radio is a background medium. Most listeners are doing something else while listening, which means your ad has to work hard to be listened to and understood.
* Advertising costs are based on ratings which are approximations based on diaries kept in a relatively small fraction of a region's homes.
* Not as fast as using a phone; could take a little bit
* The line could get fuzzy, or not clear
Advantages of radio advertising include that it provides specific audience targeting, and it is cheaper than TV. Disadvantages include that radio ads are easily forgotten and that people tend to ignore radio as background noise.Since radio is an older form of technology, many people forget that it is an option, but this has its upsides as well. According to Allbuisness.com, 30-second ad spots on the radio are often cheaper and easier to create than their television equivalents. It is possible to create radio ads tremendously quickly as well. This is not the case in television. Ads in television take weeks or longer to create. Radio ads also have an advantage over magazine ads in that there is no need to wait until the next issue is released before creating more ad spots. Since radio stations often target style with specific demographics like pop or talk radio, it is also possible to use radio ads to appeal to people within those demographics specifically.
The downside to radio is that the best times for radio are during the morning and evening commutes, so these time slots are often competitive. Another problem is that it is easy for audience members to miss an ad since they are often listening to radio while doing something else. This makes it important to run the ad a few times to make sure everyone hears it.
Posts: 56
Threads: 30
Joined: Jul 2009
Reputation:
0
* . , , . .
* .
* .
* .
* .
* . , .
* , .
* .
* . , " " .
* . , .
* .
* ;
* , .
Posts: 46
Threads: 25
Joined: Feb 2009
Reputation:
0
HI am Haneen and I would like to get the details of advantages and disadvantages of radio in hindi language. ..
