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Transponders forms communication channel among transmitter and receiver. It is a part of the payload of a telecommunications satellite. Transponder modulates, receive, amplify, and re-transmit an uplinked signal. There can be 20 to 30 transponders on a single satellite. Common bandwidths of a Satellite transponder are 27, 33, 36, 54 and 72 MHz.  The signals transmitted from earth are received by the satellites at very low power level due to the large distance. Combination of equipments in transponder amplifies these carriers with given frequency. Transponder uses high power amplifier (HPA) in order to amplify carrier signal.

Source: Syndicate Market Research