• VINAY KUMAR SINGH
• HRIDAYA NAND SAH

ABSTRACT: In this paper we presents a bit about satellite telecommunications. We study a brief introduction and history of satellite telecommunications will be presented. An object which are sometimes called artificial satellites to distinguish them from natural satellites such as the Moon. Satellites are useful for a number of purposes. They are used for communications, navigation, map-making, astronomical observations, scientific experimentation, and monitoring of the Earth's environment and weather conditions. Some satellites with military missions may conduct espionage or carry weapons to destroy enemy warheads and satellites. Transponder performs the functions of both transmitter and receiver-Responder in a satellite. Hence, the word ‘Transponder’ is obtained by the combining few letters of two words, Transmitter -Trans and Responder -ponder.

"APPLICATIONS OF TRANSPONDERS IN SATELLITE COMMUNICATION SYSTEM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.4, Issue 7, page no.205-211, July-2017, Available :http://www.jetir.org/papers/JETIR1707038.pdf

"APPLICATIONS OF TRANSPONDERS IN SATELLITE COMMUNICATION SYSTEM", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.4, Issue 7, page no. pp205-211, July-2017, Available at : http://www.jetir.org/papers/JETIR1707038.pdf