communication satellite signals

Communication Satellites - Communication satellites are normally geostationary satellites. They have devices called transponder which receive signals from an earth station and transmit them in different directions. The signals in..

Communication satellites are normally geostationary satellites. They have devices called transponder which receive signals from an earth station and transmit them in different directions. The signals in the form of electromagnetic radiation ar..

) use a similar mechanism. In the case of intercontinental telecommunication, two or more satellites are linked together. High frequency radio and submarine cable systems have been widely used for long- distance overseas telecommunications. The high frequency band from 3 MHz to 30 MHz has..

The area of the Earth from which a satellite is visible increases with the altitude. So, satellites at higher altitudes give larger coverage. At altitudes below 10,000 km, the number of satellites required for global coverage would be excessive. At altitudes above 20,0..

The satellite communication is costly because of the limited life of a satellite. A geosynchronous satellite using high gain antenna requires close control of both its position and altitude. The position and altitude control rockets require fuel that has to ..

Communication Systems..

(the portion of the atmosphere closest to the ground). Frequencies below the HF range travel around the curvature of the Earth, sometimes right around the globe. These ground waves, or surface waves as they are called, are one of the two original means of beyond- the- horizon propagation. All broad..

The successive generations of communication satellites can incorporate the latest developments in electronics and communication engineering technology. This would help to pack much more capacity into satellites of comparable size. It is possible that with th..

Communication Systems..

Communication Systems with Input and Output Transducers - The input transducer converts the message to an electrical signal say a voltage or current. Another transducer at the destination converts the output signal to the desired message fo..