TRANSMISSION OF RADIO WAVES THROUGH SPACE

Explanation Of Transmission Of Radio Waves Through Space

TRANSMISSION OF RADIO WAVES: Electrical signals respectively information from a  microphone,  a TV camera, or a computer can be sent from one place to another place using either cables or radio waves. Information in the forms of audio frequency (AF) signals may be transmitted directly by the cable. However, in order to send information over a long distance, it has to be superimposed in electromagnetic waves.

radio transmission and receiving system

Sound waves produced at the radio station are changed into electrical signals through microphone. These electric signals are then fed into the transmission antenna that consists of two metal roads. Signal falling on the transmission antenna oscillate the charges which which then emit these electrical signals in the form of electromagnetic radio waves.

At the receiving end, the receiver selects and amplifies the modulated signal. The demodulate  then extract the information signals and deliver it to be the receptor.Radio transmission and Receiving system is shown above in Fig.

Fax Machine

 Facsimile's or Fax machine are must for many business around the World. A fax machine basically scans a page convert its text and graphic into electronic signals and transmit it to another fax machine through telephone line. The reviving machine convert the signal and use a printer  (usually built in) to create the copy of the message that was sent.

Cell Phone

 Radio technology is applied in mobile phone. It is a type of radio having two way communication. A cell phone a carries a radio transmitter and receiver inside it. It sends and receives the message in the form of radio waves. Cell phone networking system consist of Cells and Base Station (BSS) and Mobile Switching Center (MSC). A base station is wireless communication station set up at a particular geographical location. The geographical area converted by a single base station is known as Cell.

The group of cells forms a cluster. All BSS with in a cluster are connected to To MSC using land lines. The MSC stores information about the subscriber located within the cluster and is responsible for directions calls to them. When a caller calls another cell phone, sound waves of the caller are converted into radio radio waves signal. This radio signal of particular frequency is sent to the local base station of the caller where the signal is assigned a specific radio frequency. This signal is then sent to the base station of the receivers through the receivers. Mobile receiving again changes the radio waves into sounds.

Photo Phone

 Modern version of photos or video phones is shown bellow. Contrary to a common telephone, users can see the pitcher of each other. By using the photos and phone number of our friends or family member on this telephone, we can call them by pressing the pad with their or friends on photo phone with the physical appearances of each other.