ISRO is the space agency under the Department of Space of Government of India, headquartered in the city of Bengaluru, Karnataka. Its vision is to harness space technology for national development, while pursuing space science research and planetary exploration. Antrix Corporation Limited (ACL) is a Marketing arm of ISRO for promotion and नेटवर्क उपकरणों के उदाहरण (Examples of network devices) डेस्कटॉप कंप्यूटर, लैपटॉप, मेनफ्रेम और सर्वर. कंसोल और थिन क्लाइंट (Thin Client) फायरवॉल. ब्रिजस (Bridges A communication satellite is an artificial satellite that transmits the signal via a transponder by creating a channel between the transmitter and the receiver located at different locations on the Earth. Telephone, radio, television, internet, and military applications use satellite communications. 6. connection to telecom networks is considered to be achieved by satellites with large coverage areas especially over oceanic regions during long-haul flights. the bandwidth that is requested by standard interfaces of the wireless standards needs to be adapted to the available bandwidth (typically: 432 kb/s in down- link, 144 kb/s up-link … Bookmark File PDF Satellite Communication System Engineering Notes Notes launched in 1960, was the world's first active repeater satellite. The first communications satellite was Sputnik 1. Put into orbit by the Soviet Union on October 4, 1957, it was equipped with an onboard radio- transmitter that worked on two frequencies: 20.005 and 40.002 MHz. One of the first applications of satellites for communication was the establishment of international telephone backbones. Instead of using cables, it was sometimes faster to launch a new satellite. These satellites are being replaced by fiber optical cables crossing the oceans. Connections for remote or developing areas The Indian National Satellite (INSAT) system is one of the largest domestic communication satellite systems in Asia-Pacific region with nine operational communication satellites placed in Geo-stationary orbit. Established in 1983 with commissioning of INSAT-1B, it initiated a major revolution in India's communications sector and sustained Block Diagram of Satellite Communication System. The uplink frequencies (5.9---6.4 GHZ) are used for T/N from the earth station to the satellite and down link frequencies (3.7—4.2GHZ). The above frequencies are used for T/N from the satellite to the earth station , the uplink frequencies are converted to lower frequencies by the mixer and A data communications system has five components. 1. Message. The message is the information (data) to be communicated. Popular forms of information include text, numbers, pictures, audio, and video. 2. Sender. The sender is the device that sends the data message. Communication media: It is the path through which the message travels between source and destination. It is also called medium or link which is either wired or wireless. For example, a television cable, telephone cable, ethernet cable, satellite link, microwaves, etc. We will study about various communication media in section 11.5. Satellite communication is an electronic communication package placed in an orbit. Its prime objective is to initiate or assist through space. It has made a major contribution to the pattern of international communication. The satellite microwave is basically a microwave relay station in space. It uses a geosynchronous satellite