Satellite Communications

To transmit large volume of data at high speed,over 100,000 CPS,broad channels are employed.Coaxial cables,microwave circuits and communication satellites are commonly used for broadband channels.To transmit data though space microwave channels are used.In microwave system very high frequency radio signals are employed.when microwave systems are used through ground routes repeaters stations are installed at every 40 KM.The data signals are received,amplified and then transmitted onward at each repeater station,Alternatively,if a communication satellite is available,data can be routed though it.A satellite is the quickest and cheapest medium for transmission of voice,data,text and pictures over long distance.The data are sent to the satellite from a transmitting station on the earth.The data are sent to the satellite from a transmitting station on the earth.The satellite acts as a reflector.It accepts signals from one point on the earth and returns the same signals to some other point on the earth.If a satellite's speed matches the earth's rotation.it may look stationary from the earth.several satellites are now in orbit to handle transmission of data in a certain zone or all over the world.